Very interesting results: external clocking does not have any impact.
Here below the updated list for single ADDA converter. I will add another list for results from two converters sets later on. Mytek 8 x 192 (MainTime) 1,002sec, 0,450dB (L), 0,553dB (R)..Corr Depth: 35,3 dB (L), 36,9 dB (R) Difference: 55.2 dBFS (L) 56.0 dBFS (R) Aurora 8 (cylens) 750usec, 0,085dB (L), 0,080dB (R)..Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 54.2 dBFS (L) 55.1 dBFS (R) TC Electronics Impact Twin (AndG) 2,286msec, 0,524dB (L), 0,817dB (R)..Corr Depth: 32,0 dB (L), 33,6 dB (R) Difference: 51.7 dBFS (L) 52.7 dBFS (R) RME HDSP 9632 (schtim) 1.564usec, 0.463dB (L), 0.461dB (R)..Corr Depth: 31.4 dB (L), 33.0 dB (R) Difference: 51.2 dBFS (L) 52.1 dBFS (R) Prism Orpheus (MainTime) 1sec, 0,075dB (L), 0,064dB (R)..Corr Depth: 30,8 dB (L), 32,4 dB (R) Difference: 51.1 dBFS (L) 52.4 dBFS (R) RME Fireface 400 (didier.brest) 36,94usec, 0,298dB (L), 0,311dB (R)..Corr Depth: 30,2 dB (L), 31,8 dB (R) Difference: 49.8 dBFS (L) 50.8 dBFS (R) Echo Audiofire 8 with ADAT clocked to an RME HDSP 9632 (schtim) 1.164sec, 0.128dB (L), 0.126dB (R)..Corr Depth: 25.9 dB (L), 27.5 dB (R) Difference: 45.5 dBFS (L) 46.5 dBFS (R) MAudio Profire 2626 (cylens) 13,21usec, 0,505dB (L), 0,486dB (R)..Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference; 44,0 dBFS 44,9 dBFS Echo Audiofire 8 non adat CS4272 (guze) 2,952msec, 0,840dB (L), 0,885dB (R)..Corr Depth: 26,4 dB (L), 28,2 dB (R) Difference: 40.6 dBFS (L) 40.6 dBFS (R) Apogee Duet2 (isma) 5,645msec, 0,976dB (L), 0,962dB (R)..Corr Depth: 19,8 dB (L), 21,4 dB (R) Difference: 40.2 dBFS (L) 41.6 dBFS (R) Yamaha Steinberg MR816X (didier.brest) 2,101msec, 1,104dB (L), 0,605dB (R)..Corr Depth: 19,1 dB (L), 21,0 dB (R) Difference: 38.6 dBFS (L) 40.0 dBFS (R) Edirol FA66 (didier.brest) 8,95msec, 1,015dB (L), 0,605dB (R)..Corr Depth: 15,6 dB (L), 17,1 dB (R) Difference: 34.4 dBFS (L) 35.4 dBFS (R) RME Babyface (didier.brest) 1,555usec, 0,352dB (L), 0,414dB (R)..Corr Depth: 9,2 dB (L), 10,8 dB (R) Difference: 28.8 dBFS (L) 29.8 dBFS (R) 
This is an interesting test indeed. I'd be interested to see where the SSL Alphalink fits into all of this and maybe some older stuff like Radar?
Also, everyone's ears are different so one person might be able to hear a difference down at 50 dbfs while another may not. That being said and skeptical of it as I might be, for this type of scenario, has anyone ever established any kind of a null threshold in which anything below that threshold is effectively inconsequential? 
Evaluating DAAD loops from this wav file by means of Audio DiffMaker.
ADDA converters Mytek 8 x 192 (MainTime) Corr Depth: 35,3 dB (L), 36,9 dB (R) Difference: 55.2 dBFS (L) 56.0 dBFS (R) Aurora 8 (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 54.2 dBFS (L) 55.1 dBFS (R) TC Electronics Impact Twin (AndG) Corr Depth: 32,0 dB (L), 33,6 dB (R) Difference: 51.7 dBFS (L) 52.7 dBFS (R) RME HDSP 9632 (schtim) Corr Depth: 31.4 dB (L), 33.0 dB (R) Difference: 51.2 dBFS (L) 52.1 dBFS (R) Prism Orpheus (MainTime) Corr Depth: 30,8 dB (L), 32,4 dB (R) Difference: 51.1 dBFS (L) 52.4 dBFS (R) RME Fireface 400 (didier.brest) Corr Depth: 30,2 dB (L), 31,8 dB (R) Difference: 49.8 dBFS (L) 50.8 dBFS (R) Echo Audiofire 8 non adat CS4272 (guze) Corr Depth: 26,4 dB (L), 28,2 dB (R) Difference: 40.6 dBFS (L) 40.6 dBFS (R) Apogee Duet2 (isma) Corr Depth: 19,8 dB (L), 21,4 dB (R) Difference: 40.2 dBFS (L) 41.6 dBFS (R) Yamaha Steinberg MR816X (didier.brest) Corr Depth: 19,1 dB (L), 21,0 dB (R) Difference: 38.6 dBFS (L) 40.0 dBFS (R) Edirol FA66 (didier.brest) Corr Depth: 15,6 dB (L), 17,1 dB (R) Difference: 34.4 dBFS (L) 35.4 dBFS (R) RME Babyface (didier.brest) Corr Depth: 9,2 dB (L), 10,8 dB (R) Difference: 28.8 dBFS (L) 29.8 dBFS (R) Sets of different converters Aurora8 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 55.3 dBFS (L) 56.5 dBFS (R) Echo Audiofire 8 with ADAT clocked by RME HDSP 9632 (schtim) Corr Depth: 25.9 dB (L), 27.5 dB (R) Difference: 45.5 dBFS (L) 46.5 dBFS (R) MAudio Profire2626 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.1 dBFS (L) 45.0 dBFS (R) MAudio Profire2626 clocked by Lynx Aurora8 (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.0 dBFS (L) 44.9 dBFS (R) Apogee Duet 2 > RME Babyface (isma) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference: 20.8 dBFS (L) 19.4 dBFS (R) RME Babyface > RME Fireface 400 (didier.brest) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference 29,4 dBFS (L), 28,8 dBFS (R) Please give me the link for downloading an ADDA loop achieved by any ADDA converter, even if it is already in the list: it is is interesting for checking the consistency of the performance. Lavry, UA, RME UFX especially welcome. 

Thank you guze!
Evaluating DAAD loops from this wav file by means of Audio DiffMaker. ADDA converters Mytek 8 x 192 (MainTime) Corr Depth: 35,3 dB (L), 36,9 dB (R) Difference: 55.2 dBFS (L) 56.0 dBFS (R) Aurora 8 (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 54.2 dBFS (L) 55.1 dBFS (R) TC Electronics Impact Twin (AndG) Corr Depth: 32,0 dB (L), 33,6 dB (R) Difference: 51.7 dBFS (L) 52.7 dBFS (R) RME HDSP 9632 (schtim) Corr Depth: 31.4 dB (L), 33.0 dB (R) Difference: 51.2 dBFS (L) 52.1 dBFS (R) Prism Orpheus (MainTime) Corr Depth: 30,8 dB (L), 32,4 dB (R) Difference: 51.1 dBFS (L) 52.4 dBFS (R) RME Fireface 400 (didier.brest) Corr Depth: 30,2 dB (L), 31,8 dB (R) Difference: 49.8 dBFS (L) 50.8 dBFS (R) Echo Audiofire 12 (guze) Corr Depth: 28,8 dB (L), 30,1 dB (R) Difference: 48.4 dBFS (L) 49.2 dBFS (R) Echo Audiofire 8 non adat CS4272 (guze) Corr Depth: 26,4 dB (L), 28,2 dB (R) Difference: 40.6 dBFS (L) 40.6 dBFS (R) Apogee Duet2 (isma) Corr Depth: 19,8 dB (L), 21,4 dB (R) Difference: 40.2 dBFS (L) 41.6 dBFS (R) Yamaha Steinberg MR816X (didier.brest) Corr Depth: 19,1 dB (L), 21,0 dB (R) Difference: 38.6 dBFS (L) 40.0 dBFS (R) Edirol FA66 (didier.brest) Corr Depth: 15,6 dB (L), 17,1 dB (R) Difference: 34.4 dBFS (L) 35.4 dBFS (R) RME Babyface (didier.brest) Corr Depth: 9,2 dB (L), 10,8 dB (R) Difference: 28.8 dBFS (L) 29.8 dBFS (R) Sets of different converters Aurora8 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 55.3 dBFS (L) 56.5 dBFS (R) Echo Audiofire 8 with ADAT clocked by RME HDSP 9632 (schtim) Corr Depth: 25.9 dB (L), 27.5 dB (R) Difference: 45.5 dBFS (L) 46.5 dBFS (R) MAudio Profire2626 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.1 dBFS (L) 45.0 dBFS (R) MAudio Profire2626 clocked by Lynx Aurora8 (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.0 dBFS (L) 44.9 dBFS (R) Apogee Duet 2 > RME Babyface (isma) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference: 20.8 dBFS (L) 19.4 dBFS (R) RME Babyface > RME Fireface 400 (didier.brest) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference 29,4 dBFS (L), 28,8 dBFS (R) Please give me the link for downloading an ADDA loop achieved by any ADDA converter, even if it is already in the list: it is is interesting for checking the consistency of the performance. Lavry, UA, RME UFX especially welcome. 
Let's put some more interpretable facts on the table! ;)
This is the measured filter slope of the Babyface's inputs: http://i.imgur.com/jhJD5.png As you can see the 0.5 dB point is at around 45 Hz, the 1 dB point is at around 30 Hz. Furthermore the Babyface's Input is on average 2 dB hotter compared to its output when set to 0 dB gain. With pure sinusoidal signals the peak difference is about 2.0  2.3 dB. So any loopback measurements must be made with the *output* set to at least 2.3 dB, better use some more for possible variance. http://i.imgur.com/LlYg6.png With pure square signals you need to pull down the output level even more. At 1 KHz it's the same 2.3 dB as with sinusoidal, at 50 Hz you need to go as low as 6 dB, and all the way down to 1 Hz you need to use 9 dB. That is because the lower the frequency the more the square will overshoot at its ascending ramp. http://i.imgur.com/bPFxO.png So before we go on discussing you need to do new measurements with modified output levels, preferably while running your test file through the loop to even out the levels. Else any loopback measurements, be they made with Audio DiffMaker or other software, that does not apply this output level reduction will measure input *distortion*! 
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RME Babyface (didier.brest) 1,555usec, 0,352dB (L), 0,414dB (R)..Corr Depth: 9,2 dB (L), 10,8 dB (R) Difference: 28.8 dBFS (L) 29.8 dBFS (R) Hence the Babyface loop was about 0.4 dB quieter than the original. I got in touch by PM with another Babyface owner who got similar (a few tenth of dBs worse...) results. However if you have got the Babyface, would you please record a loop from the original file used for this test ? 
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By the way as i said in this other thread (i think you read this thread too) the white noise was recorded. https://www.gearslutz.com/board/gear...ml#post7244975 The fact is that you push a button and read parameters but you don't really know what happends. I'm sorry but i don't call this science. The corr depth is calculated with a collection of datas, it is by definition a statistic result. I will give you a small example with a statistic result which show you how wrong it can be interpreted. 
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Here is an example of how much a difference this filter alone can make in a null/phaseinversion test: Material with lowpass filtered content (aka low signal dB in sloop area of BF's input filter) http://i.imgur.com/oT4AA.png Same material without the lowpass filter http://i.imgur.com/rsh4i.png 
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Btw.. are the cables you're testing both terminated the same (both XLR or both TRS)? 
I just get a TC Twin Impact so i made the test with AudioDiff to compare it to an EMU1616M.
I used the original file provided by Didier in mono 44khz/16bits. Here are the settings for AudioDiff : http://img259.imageshack.us/img259/4981/settingsq.jpg Result with TC Twin Impact after one pass : >> ******************************** >> (not configured for EQ response correction) >> Beginning difference extraction >> Files are monophonic, at 44,1kHz sample rate, about 121,1 seconds long. >> The Reference track is 16 bits; the Compared Track is 16 bits >> Using Large memory algorithms >> Finding the spectra of the "Reference" and "Compared" tracks >> [dual fourier transform: size 2x 8388608] >> Correlating the "Compared" with the "Reference" >> [inverse fourier transform: size 8388608] >> Coarse Time Offset = 0sec. >> Move track subsections to freqency domain >> Transforming overlapped portions of "Reference" and "Compared" tracks >> [dual fourier transform: size 2x 131072] >> [dual fourier transform: size 2x 131072] >> [fourier transform: size 131072] >> [fourier transform: size 131072] >> Calculating energy in Reference track >> Beginning fine determination of time offset between tracks >> Finished fine determination of time offset between tracks >> Beginning fine determination of gain difference between tracks >> Finished fine determination of gain difference between tracks >> Aligning the "Compared" track to the "Reference" track >> Sample Rate error is 0,0052 ppm, adjustment unnecessary >> [inverse fourier transform: size 8388608] >> Saving the aligned COMPARE file and calculating the Difference track >> Calculating Correlated null depth. >> [fourier transform: size 8388608] >> [fourier transform: size 8388608] >> Complete: saving the "Difference" WAV file >> Parameters: 118nsec, 0,001dB.Corr Depth: 30,0 dB Result with EMU1616M after one pass : >> ******************************** >> (not configured for EQ response correction) >> Beginning difference extraction >> Files are monophonic, at 44,1kHz sample rate, about 121,1 seconds long. >> The Reference track is 16 bits; the Compared Track is 16 bits >> Using Large memory algorithms >> Finding the spectra of the "Reference" and "Compared" tracks >> [dual fourier transform: size 2x 8388608] >> Correlating the "Compared" with the "Reference" >> [inverse fourier transform: size 8388608] >> Coarse Time Offset = 113,4usec. >> Move track subsections to freqency domain >> Transforming overlapped portions of "Reference" and "Compared" tracks >> [dual fourier transform: size 2x 131072] >> [dual fourier transform: size 2x 131072] >> [fourier transform: size 131072] >> [fourier transform: size 131072] >> Calculating energy in Reference track >> Beginning fine determination of time offset between tracks >> Finished fine determination of time offset between tracks >> Beginning fine determination of gain difference between tracks >> Finished fine determination of gain difference between tracks >> Aligning the "Compared" track to the "Reference" track >> Correcting "Compared" Sample Rate, adjust by 0,0830 ppm, avg. >> [multiple inverse fourier transform: size 4x 8388608] >> Saving the aligned COMPARE file and calculating the Difference track >> Calculating Correlated null depth. >> [fourier transform: size 8388608] >> [fourier transform: size 8388608] >> Complete: saving the "Difference" WAV file >> Parameters: 108,8usec, 2,886dB rate adj=0,0830 ppm.Corr Depth: 29,8 dB TC Twin Impact : Parameters: 118nsec, 0,001dB.Corr Depth: 30,0 dB EMU1616M : Parameters: 108,8usec, 2,886dB rate adj=0,0830 ppm.Corr Depth: 29,8 dB I wonder how you can get 32db with the TC Twin Impact after 10 pass when i get only 30db after one pass. After this test the EMU1616M = the TC Twin Impact which is in the top of converters (according to your evaluations)....big lol. By the way, the headphone output (on the dock) sounds slightly clearer and detailled with the EMU than with the TC Impact. Due to the fact that the headphone output on the pcmcia card sounds better than the dock version, the monitoring of the EMU is far better than the one available for the TC Impact. The patchbay of the EMU is more powerful. I have not compared the preamps for the moment but i already know that i don't like the ones of the EMU. 
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2) Could you upload at some file sharing site (mediafire for instance) the wav files of the loops from the TC and the EMU so that I can add their results here ? Thanks in advance.jkthtyrt 3) My correlated depth figures are got with the default setting of Audio diffMaker that limits the measurement to 100 Hz12 kHz. This may explain the 2 dB discrepancy between both our figures for the TC. 
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8,087dB (L), 8,151dB (R)..Corr Depth: 9,1 dB (L), 10,8 dB (R) Difference: 28,7 dBFS (L) 29,7 dBFS (R) which is within 0.1 dB the same like my first result got with about 2 dB gain. I might make another measurement with the Fireface 400 using the preamp imputs (12) so that to check what is the preamp impact. But the Babyface DA > Fireface AD loop performs bad also, which seems to show that the Babyface preamp is not the only issue. Current results: Evaluating DAAD loops from this wav file by means of Audio DiffMaker. ADDA converters Mytek 8 x 192 (MainTime) Corr Depth: 35,3 dB (L), 36,9 dB (R) Difference: 55.2 dBFS (L) 56.0 dBFS (R) Aurora 8 (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 54.2 dBFS (L) 55.1 dBFS (R) TC Electronics Impact Twin (AndG) Corr Depth: 32,0 dB (L), 33,6 dB (R) Difference: 51.7 dBFS (L) 52.7 dBFS (R) RME HDSP 9632 (schtim) Corr Depth: 31.4 dB (L), 33.0 dB (R) Difference: 51.2 dBFS (L) 52.1 dBFS (R) Prism Orpheus (MainTime) Corr Depth: 30,8 dB (L), 32,4 dB (R) Difference: 51.1 dBFS (L) 52.4 dBFS (R) RME Fireface 400 (didier.brest) Corr Depth: 30,2 dB (L), 31,8 dB (R) Difference: 49.8 dBFS (L) 50.8 dBFS (R) Echo Audiofire 12 (guze) Corr Depth: 28,8 dB (L), 30,1 dB (R) Difference: 48.4 dBFS (L) 49.2 dBFS (R) Echo Audiofire 8 non adat CS4272 (guze) Corr Depth: 26,4 dB (L), 28,2 dB (R) Difference: 40.6 dBFS (L) 40.6 dBFS (R) Apogee Duet2 (isma) Corr Depth: 19,8 dB (L), 21,4 dB (R) Difference: 40.2 dBFS (L) 41.6 dBFS (R) Yamaha Steinberg MR816X (didier.brest) Corr Depth: 19,1 dB (L), 21,0 dB (R) Difference: 38.6 dBFS (L) 40.0 dBFS (R) Edirol FA66 (didier.brest) Corr Depth: 15,6 dB (L), 17,1 dB (R) Difference: 34.4 dBFS (L) 35.4 dBFS (R) RME Babyface (didier.brest) Corr Depth: 9,2 dB (L), 10,8 dB (R) Difference: 28.8 dBFS (L) 29.8 dBFS (R) Sets of different converters Aurora8 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 55.3 dBFS (L) 56.5 dBFS (R) Echo Audiofire 8 with ADAT clocked by RME HDSP 9632 (schtim) Corr Depth: 25.9 dB (L), 27.5 dB (R) Difference: 45.5 dBFS (L) 46.5 dBFS (R) MAudio Profire2626 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.1 dBFS (L) 45.0 dBFS (R) MAudio Profire2626 clocked by Lynx Aurora8 (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.0 dBFS (L) 44.9 dBFS (R) Apogee Duet 2 > RME Babyface (isma) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference: 20.8 dBFS (L) 19.4 dBFS (R) RME Babyface > RME Fireface 400 (didier.brest) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference 29,4 dBFS (L), 28,8 dBFS (R) Please give me the link for downloading an ADDA loop achieved by any ADDA converter, even if it is already in the list: it is is interesting for checking the consistency of the performance. Lavry, UA, RME UFX especially welcome. 
Once I understood how to use this software properly I will post my own results. But from what I saw yet the "higher" results you are getting for the BF are simply a result of the BF input's highpass filter.
See my realtime/manual phaseinversion test above (orange graphs) to get an idea how the input filter alters the readings. Filter your testfile and repeat the test and you'll likely get a lot better results. 
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I also posted a link to RME forums, the RME support answers are quite interesting... 
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>> ******************************** >> (not configured for EQ response correction) >> Beginning difference extraction >> Files are monophonic, at 44,1kHz sample rate, about 121,1 seconds long. >> The Reference track is 16 bits; the Compared Track is 16 bits >> Using Large memory algorithms >> Finding the spectra of the "Reference" and "Compared" tracks >> [dual fourier transform: size 2x 8388608] >> Correlating the "Compared" with the "Reference" >> [inverse fourier transform: size 8388608] >> Coarse Time Offset = 1,678msec. >> Move track subsections to freqency domain >> Transforming overlapped portions of "Reference" and "Compared" tracks >> [dual fourier transform: size 2x 131072] >> [dual fourier transform: size 2x 131072] >> [fourier transform: size 131072] >> [fourier transform: size 131072] >> Calculating energy in Reference track >> Beginning fine determination of time offset between tracks >> Finished fine determination of time offset between tracks >> Beginning fine determination of gain difference between tracks >> Finished fine determination of gain difference between tracks >> Aligning the "Compared" track to the "Reference" track >> Sample Rate error is 0,0062 ppm, adjustment unnecessary >> [inverse fourier transform: size 8388608] >> Saving the aligned COMPARE file and calculating the Difference track >> Calculating Correlated null depth. >> [fourier transform: size 8388608] >> [fourier transform: size 8388608] >> Complete: saving the "Difference" WAV file >> Parameters: 1,673msec, 3,076dB.Corr Depth: 29,1 dB Reference file mono/normalized : originalmono.wav Result with TC Impact : originaltc.wav Result with EMU1616M : originalEMUVovox.wav 
All the previous results have been got from this stereo file.
Please could you do a stereo loop from this file ?diddlydoo 
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I do not have any Jack/XLR male cable.wworried Thank you for your notice about the RME forum. I am also a member of this forum (didier) but I prefer answering here to some objections: 1) Is my Babyface OK ? Another member of this forum did a loop with its own Babyface and got results worse than mine. The test file is available to anybody. So testing any Babyface is quite easy. I am of course interested in evaluating a loop from another Babyface. By the way, I think my Fireface is OK and I enjoy its sound everyday. 2) Impact of power supply I tested both the USB power supply and an external one and got similar results. 3) Audio DiffMaker gives only one figure Not exact: Audio DiffMaker provides also the difference file, the RMS level of which I measure in Wavelab. Here below the frequency spectra of these differences for the Fireface 400 (white) and the Babyface (red). One can see that the gap does not depend much on frequency, which, as an addition to the low performance from the BabyfaceD/A > Fireface A/D loop, makes doubtful the LF response from the preamp being the main cause of the lower performance from the Babyface. http://www.mediafire.com/imgbnc.php/...7b983e156g.jpg 
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Can't see the interest of doing stereo. 
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Have a look at my manual phaseinversion test above (orange graph). Doing a BF > BF loopback got me close to your "white" FF400 measurement as soon as the low frequency filter part was taken out of the loop. Interestingly once the low frequency filter is active (content present in that band) the high frequency areas' differences increase, too (harmonics I guess). 
The time alignment is determined by Audio Diiffmaker. I do not see why this measurement would be bad only (and repetitively) for the Babyface.
Result from comparison of the test file with its copy to which I applied 3 dB gain and added 62 dBFS RMS white noise: 78,77nsec, 3,001dB (L), 3,000dB (R)..Corr Depth: 76,4 dB (L), 89,9 dB (R) The accuracy of the time alignment in this case is about the sample duration divide by 300 and the accuracy of the gain correction is 0.001 dB: not so bad... 
I hope no one is surprised by differing results if they're not running the same Diffmaker settings as didier. This obviously means testing in stereo amongst other things.
I run my tests with the range set to 40k18k which is more accurate for what we're doing since performance below 100hz and above 12k is important to us. Aside from that though it shouldn't be too shocking if some units test lower. Much of the expectation of these units comes from comments passed around here from people who are testing with bias of preconceived notions, subjectivity, and an approach that's generally not all that reliable. You can read pages and pages of praise for the MR816 yet I've never seen one person mention the low frequency roll off or fact you get a different frequency response depending on whether you use 1/4" or XLR's on it! 
I think that the frequencyrange setting in Audio DiffMaker is not only the one in which the correlated depth is evaluated but also the one for determining the time alignment and gain corrections, the accuracy of which is much critical for the result. This is likely the reason why the default setting is 100 Hz12 kHz: below 100 Hz and above 12 kHz, the signaltonoise ratio is generally lower so that limiting the mesurement to 100 Hz  12 kHz may make the time alignment and the gain correction more accurate.
Anyway, whatever is this setting, the wav difference file provided by Audio DiffMaker is full band. So my measurements of the difference RMS level, on which I rely for the ranking, are not impacted directly by (or, because of the more accurate time alignment and gain correction, get benefit from) this frequency bounds. Corr Depth: 29,1 dB (L), 29,1 dB (R) Difference 48,5 dBFS (L) New list icluding TC Impact and EMU 1616m tests from ben Evaluating DAAD loops from this wav file by means of Audio DiffMaker. ADDA converters Mytek 8 x 192 (MainTime) Corr Depth: 35,3 dB (L), 36,9 dB (R) Difference: 55.2 dBFS (L) 56.0 dBFS (R) Aurora 8 (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 54.2 dBFS (L) 55.1 dBFS (R) TC Electronics Impact Twin (AndG) Corr Depth: 32,0 dB (L), 33,6 dB (R) Difference: 51.7 dBFS (L) 52.7 dBFS (R) RME HDSP 9632 (schtim) Corr Depth: 31.4 dB (L), 33.0 dB (R) Difference: 51.2 dBFS (L) 52.1 dBFS (R) Prism Orpheus (MainTime) Corr Depth: 30,8 dB (L), 32,4 dB (R) Difference: 51.1 dBFS (L) 52.4 dBFS (R) RME Fireface 400 (didier.brest) Corr Depth: 30,2 dB (L), 31,8 dB (R) Difference: 49.8 dBFS (L) 50.8 dBFS (R) TC Impact Twin (left channel only, ben) Corr Depth: 29,1 dB (L) Difference: 48,5 dBFS (L) Echo Audiofire 12 (guze) Corr Depth: 28,8 dB (L), 30,1 dB (R) Difference: 48.4 dBFS (L) 49.2 dBFS (R) EMU 1616m (left channel only, ben) Corr Depth: 28,9 dB (L) Difference: 45,9 dBFS (L) Echo Audiofire 8 non adat CS4272 (guze) Corr Depth: 26,4 dB (L), 28,2 dB (R) Difference: 40.6 dBFS (L) 40.6 dBFS (R) Apogee Duet2 (isma) Corr Depth: 19,8 dB (L), 21,4 dB (R) Difference: 40.2 dBFS (L) 41.6 dBFS (R) Yamaha Steinberg MR816X (didier.brest) Corr Depth: 19,1 dB (L), 21,0 dB (R) Difference: 38.6 dBFS (L) 40.0 dBFS (R) Edirol FA66 (didier.brest) Corr Depth: 15,6 dB (L), 17,1 dB (R) Difference: 34.4 dBFS (L) 35.4 dBFS (R) RME Babyface (didier.brest) Corr Depth: 9,2 dB (L), 10,8 dB (R) Difference: 28.8 dBFS (L) 29.8 dBFS (R) Sets of different converters Aurora8 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 55.3 dBFS (L) 56.5 dBFS (R) Echo Audiofire 8 with ADAT clocked by RME HDSP 9632 (schtim) Corr Depth: 25.9 dB (L), 27.5 dB (R) Difference: 45.5 dBFS (L) 46.5 dBFS (R) MAudio Profire2626 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.1 dBFS (L) 45.0 dBFS (R) MAudio Profire2626 clocked by Lynx Aurora8 (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.0 dBFS (L) 44.9 dBFS (R) Apogee Duet 2 > RME Babyface (isma) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference: 20.8 dBFS (L) 19.4 dBFS (R) RME Babyface > RME Fireface 400 (didier.brest) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference 29,4 dBFS (L), 28,8 dBFS (R) Please give me the link for downloading an ADDA loop achieved by any ADDA converter, even if it is already in the list: it is is interesting for checking the consistency of the performance. Lavry, UA, RME UFX especially welcome. 
_En stéréo 24 bits normalisé dans Ableton, le fichier source :
OriginalNorm.wav _Tous les enregistrements sont normalisés avec Ableton. _123 fois le même enregistrement : OriginalTcStereo241.wav http://www.mediafire.com/?6fg1uieo2gnf00j OriginalTcStereo243.wav _ j'ai interverti les câbles : OriginalTcStereo24Swap.wav _ avec le driver Asio4All : OriginalTcStereo24Asio1.wav OriginalTcStereo24Asio2.wav Certains parlent d'éviter le patchbay, je ne vois pas comment faire avec la TC ou l'EMU. 
I will ckeck these new files on next weekend.

1 Attachment(s)
hi didier,
i had big problems getting this sorted. diffmaker was crashing all the time on my win7 x64 system. (hope they update it) it would not record, so i played and recorded in reaper. i assume this should work just the same? all bitrates etc are the same, faders all at 0. the result for my echo audiofire 4 seems too bad!!! anyone else got one to test? >> Parameters: 1.509sec, 0.513dB (L), 0.412dB (R)..Corr Depth: 25.6 dB (L), 27.4 dB (R) i played out of output 3_4 into input 3_4. the files seem ok on listening. can it be i made a mistake? could you have a check of the files? i also tried output from my benchmark DAC1 phono outs into the audiofire 4 input 3_4. diffmaker won't have this file, it just crashes! here is a link to the 2 .wav files 'diffmaker audiofire 4 test.zip' diffmaker audiofire 4 test.zip i feel i may have wasted a day on this, and don't want to do any more, but if you think these file are valid please add them to the list. hope it was of some help! this is a GREAT thread to see the quality of convertors, hope it keeps growing. can the audiofire4 be this bad? 
Parameters: 4,012sec, 0,510dB (L), 0,412dB (R)..Corr Depth: 25,6 dB (L), 27,4 dB (R)

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Results list updated with the TC Impact twin stereo loop from ben instead of its mono loop. I will check the other files from ben and the ones from david1103 later on. ADDA converters Mytek 8 x 192 (MainTime) Corr Depth: 35,3 dB (L), 36,9 dB (R) Difference: 55.2 dBFS (L) 56.0 dBFS (R) Aurora 8 (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 54.2 dBFS (L) 55.1 dBFS (R) TC Electronics Impact Twin (AndG) Corr Depth: 32,0 dB (L), 33,6 dB (R) Difference: 51.7 dBFS (L) 52.7 dBFS (R) RME HDSP 9632 (schtim) Corr Depth: 31.4 dB (L), 33.0 dB (R) Difference: 51.2 dBFS (L) 52.1 dBFS (R) Prism Orpheus (MainTime) Corr Depth: 30,8 dB (L), 32,4 dB (R) Difference: 51.1 dBFS (L) 52.4 dBFS (R) RME Fireface 400 (didier.brest) Corr Depth: 30,2 dB (L), 31,8 dB (R) Difference: 49.8 dBFS (L) 50.8 dBFS (R) TC Electronics Impact Twin (ben) Corr Depth: 29,0 dB (L), 30,7 dB (R) Difference: 48,6 dBFS (L), 49,8 dBFS (R) Echo Audiofire 12 (guze) Corr Depth: 28,8 dB (L), 30,1 dB (R) Difference: 48.4 dBFS (L) 49.2 dBFS (R) EMU 1616m (left channel only, ben) Corr Depth: 28,9 dB (L) Difference: 45,9 dBFS (L) Echo Audiofire 8 non adat CS4272 (guze) Corr Depth: 26,4 dB (L), 28,2 dB (R) Difference: 40.6 dBFS (L) 40.6 dBFS (R) Apogee Duet2 (isma) Corr Depth: 19,8 dB (L), 21,4 dB (R) Difference: 40.2 dBFS (L) 41.6 dBFS (R) Yamaha Steinberg MR816X (didier.brest) Corr Depth: 19,1 dB (L), 21,0 dB (R) Difference: 38.6 dBFS (L) 40.0 dBFS (R) Edirol FA66 (didier.brest) Corr Depth: 15,6 dB (L), 17,1 dB (R) Difference: 34.4 dBFS (L) 35.4 dBFS (R) RME Babyface (didier.brest) Corr Depth: 9,2 dB (L), 10,8 dB (R) Difference: 28.8 dBFS (L) 29.8 dBFS (R) Sets of different converters Aurora8 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 55.3 dBFS (L) 56.5 dBFS (R) Echo Audiofire 8 with ADAT clocked by RME HDSP 9632 (schtim) Corr Depth: 25.9 dB (L), 27.5 dB (R) Difference: 45.5 dBFS (L) 46.5 dBFS (R) MAudio Profire2626 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.1 dBFS (L) 45.0 dBFS (R) MAudio Profire2626 clocked by Lynx Aurora8 (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.0 dBFS (L) 44.9 dBFS (R) Apogee Duet 2 > RME Babyface (isma) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference: 20.8 dBFS (L) 19.4 dBFS (R) RME Babyface > RME Fireface 400 (didier.brest) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference 29,4 dBFS (L), 28,8 dBFS (R) 
Correlated depth figures from ben's Impact Twin loops
1: 29,0 dB (L), 30,7 dB (R) 2: 29,1 dB (L), 30,8 dB (R) 3: 29,1 dB (L), 30,8 dB (R) swap: 29,1 dB (L), 30,8 dB (R) Asio1: 29,1 dB (L), 30,8 dB (R) Asio2: 29,1 dB (L), 30,8 dB (R) Results list updated with the TC Impact twin stereo loop Asio2 from ben instead of his loop 1. Correction of the BabyfaceFireface400 loop correlation depth figures that were mistakingly copiedpasted from the Duet2Babyface loop result. I will check the files from david1103 later on. DAAD loops from this wav file evaluated by means of Audio DiffMaker. ADDA converters Mytek 8 x 192 (MainTime) Corr Depth: 35,3 dB (L), 36,9 dB (R) Difference: 55.2 dBFS (L) 56.0 dBFS (R) Aurora 8 (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 54.2 dBFS (L) 55.1 dBFS (R) TC Electronics Impact Twin (AndG) Corr Depth: 32,0 dB (L), 33,6 dB (R) Difference: 51.7 dBFS (L) 52.7 dBFS (R) RME HDSP 9632 (schtim) Corr Depth: 31.4 dB (L), 33.0 dB (R) Difference: 51.2 dBFS (L) 52.1 dBFS (R) Prism Orpheus (MainTime) Corr Depth: 30,8 dB (L), 32,4 dB (R) Difference: 51.1 dBFS (L) 52.4 dBFS (R) RME Fireface 400 (didier.brest) Corr Depth: 30,2 dB (L), 31,8 dB (R) Difference: 49.8 dBFS (L) 50.8 dBFS (R) TC Electronics Impact Twin (ben) Corr Depth: 29,1 dB (L), 30,8 dB (R) Difference: 48,7 dBFS (L), 49,7 dBFS (R) Echo Audiofire 12 (guze) Corr Depth: 28,8 dB (L), 30,1 dB (R) Difference: 48.4 dBFS (L) 49.2 dBFS (R) EMU 1616m (left channel only, ben) Corr Depth: 28,9 dB (L) Difference: 45,9 dBFS (L) Echo Audiofire 8 non adat CS4272 (guze) Corr Depth: 26,4 dB (L), 28,2 dB (R) Difference: 40.6 dBFS (L) 40.6 dBFS (R) Apogee Duet2 (isma) Corr Depth: 19,8 dB (L), 21,4 dB (R) Difference: 40.2 dBFS (L) 41.6 dBFS (R) Yamaha Steinberg MR816X (didier.brest) Corr Depth: 19,1 dB (L), 21,0 dB (R) Difference: 38.6 dBFS (L) 40.0 dBFS (R) Edirol FA66 (didier.brest) Corr Depth: 15,6 dB (L), 17,1 dB (R) Difference: 34.4 dBFS (L) 35.4 dBFS (R) RME Babyface (didier.brest) Corr Depth: 9,2 dB (L), 10,8 dB (R) Difference: 28.8 dBFS (L) 29.8 dBFS (R) Sets of different converters Aurora8 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 55.3 dBFS (L) 56.5 dBFS (R) Echo Audiofire 8 with ADAT clocked by RME HDSP 9632 (schtim) Corr Depth: 25.9 dB (L), 27.5 dB (R) Difference: 45.5 dBFS (L) 46.5 dBFS (R) MAudio Profire2626 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.1 dBFS (L) 45.0 dBFS (R) MAudio Profire2626 clocked by Lynx Aurora8 (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.0 dBFS (L) 44.9 dBFS (R) RME Babyface > RME Fireface 400 (didier.brest) Corr Depth: 16,6 dB (L), 18,4 dB (R) Difference 29,4 dBFS (L), 28,8 dBFS (R) Apogee Duet 2 > RME Babyface (isma) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference: 20.8 dBFS (L) 19.4 dBFS (R) 
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Results list updated with Audiofire loop from david1103. DAAD loops from this wav file evaluated by means of Audio DiffMaker. ADDA converters Mytek 8 x 192 (MainTime) Corr Depth: 35,3 dB (L), 36,9 dB (R) Difference: 55.2 dBFS (L) 56.0 dBFS (R) Aurora 8 (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 54.2 dBFS (L) 55.1 dBFS (R) TC Electronics Impact Twin (AndG) Corr Depth: 32,0 dB (L), 33,6 dB (R) Difference: 51.7 dBFS (L) 52.7 dBFS (R) RME HDSP 9632 (schtim) Corr Depth: 31.4 dB (L), 33.0 dB (R) Difference: 51.2 dBFS (L) 52.1 dBFS (R) Prism Orpheus (MainTime) Corr Depth: 30,8 dB (L), 32,4 dB (R) Difference: 51.1 dBFS (L) 52.4 dBFS (R) RME Fireface 400 (didier.brest) Corr Depth: 30,2 dB (L), 31,8 dB (R) Difference: 49.8 dBFS (L) 50.8 dBFS (R) TC Electronics Impact Twin (ben) Corr Depth: 29,1 dB (L), 30,8 dB (R) Difference: 48,7 dBFS (L), 49,7 dBFS (R) Echo Audiofire 12 (guze) Corr Depth: 28,8 dB (L), 30,1 dB (R) Difference: 48.4 dBFS (L) 49.2 dBFS (R) EMU 1616m (left channel only, ben) Corr Depth: 28,9 dB (L) Difference: 45,9 dBFS (L) Echo Audiofire 4 (david1103) Corr Depth: 25,6 dB (L), 27,4 dB (R) Difference: 45,2 dBFS (L), 46,3 dBFS (R) Echo Audiofire 8 non adat CS4272 (guze) Corr Depth: 26,4 dB (L), 28,2 dB (R) Difference: 40.6 dBFS (L) 40.6 dBFS (R) Apogee Duet2 (isma) Corr Depth: 19,8 dB (L), 21,4 dB (R) Difference: 40.2 dBFS (L) 41.6 dBFS (R) Yamaha Steinberg MR816X (didier.brest) Corr Depth: 19,1 dB (L), 21,0 dB (R) Difference: 38.6 dBFS (L) 40.0 dBFS (R) Edirol FA66 (didier.brest) Corr Depth: 15,6 dB (L), 17,1 dB (R) Difference: 34.4 dBFS (L) 35.4 dBFS (R) RME Babyface (didier.brest) Corr Depth: 9,2 dB (L), 10,8 dB (R) Difference: 28.8 dBFS (L) 29.8 dBFS (R) Sets of different converters Aurora8 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 34,6 dB (L), 36,3 dB (R) Difference: 55.3 dBFS (L) 56.5 dBFS (R) Echo Audiofire 8 with ADAT clocked by RME HDSP 9632 (schtim) Corr Depth: 25.9 dB (L), 27.5 dB (R) Difference: 45.5 dBFS (L) 46.5 dBFS (R) MAudio Profire2626 clocked by RME HDSPe RayDAT (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.1 dBFS (L) 45.0 dBFS (R) MAudio Profire2626 clocked by Lynx Aurora8 (cylens) Corr Depth: 24,4 dB (L), 25,9 dB (R) Difference: 44.0 dBFS (L) 44.9 dBFS (R) RME Babyface > RME Fireface 400 (didier.brest) Corr Depth: 16,6 dB (L), 18,4 dB (R) Difference 29,4 dBFS (L), 28,8 dBFS (R) Apogee Duet 2 > RME Babyface (isma) Corr Depth: 13,6 dB (L), 14,8 dB (R) Difference: 20.8 dBFS (L) 19.4 dBFS (R) 