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RME Babyface, Kemper Amp, S/PDIF Woes
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Old 29th July 2012   #1
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RME Babyface, Kemper Amp, S/PDIF Woes

Hi guys

Recently picked up a Kemper amp, and am attempting to work out how to go about using it in combination with the babyface digital i/o. I have to admit I am a total newbie when it comes to digital cabling so please forgive my total ignorance, but I can't work out what cabling is required to interface with one another.

As far as I was aware the babyface has an ADAT & S/pdif out. From the stuff I read, the Kemper also has a S/pidif out - so I sort of assumed I could just pick up a TOSLINK Optical Cable and the two would make sweet love...sadly, it seems this is one marriage on the rocks.

On receiving a digital (TOS) Optical Interconnect cable, it fits absolutely fine into the babyface, but doesn't fit into the kemper s/pidif out out, whose connection is sorta round like a phono i/o.

On reading the kemper manual it only refers to digital i/o as spidif but after doing a bit of research on line, am I right in saying the Kempers digital out is in fact an electrical output that requires an RCA type coaxial connection?

So in essence, do I need a cable that is one side TOS, and the other side RCA coaxial? Do such cables exist, or do I have to buy another cable like this:

Pro Video Digital Coaxial Audio Interconnect 2m : Digital Audio : Maplin Electronics

and then a conversion box like this:

Coaxial to Optical Digital Signal Convertor : Digital Audio : Maplin Electronics

although that box seems to be one way only, in theory would that do the job for recording digital signal to DAW..would going into one of these conversion boxes not degrade the signal..thus rendering the whole thing kind of pointless? Is there another solution I am not aware of?
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Old 29th July 2012   #2
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I know this is not what your looking for but why not just record it with a standard quarter inch audio cable, Then the sound will hit "air" once and i find this helps get things more organic sounding on the way in when tracking. You will also get the same color from your converters/interface for everything you record in and this will help things gel that much better.

This way all you would need would be a single quarter inch or XLR cable right into your interface.

Also then your not locked into the kemper 44.1 sample rate that the spdif section is locked to. Say if you wanted to record at 96k.
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Old 30th July 2012   #3
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Originally Posted by tekn0 View Post
I know this is not what your looking for but why not just record it with a standard quarter inch audio cable, Then the sound will hit "air" once and i find this helps get things more organic sounding on the way in when tracking. You will also get the same color from your converters/interface for everything you record in and this will help things gel that much better.

This way all you would need would be a single quarter inch or XLR cable right into your interface.

Also then your not locked into the kemper 44.1 sample rate that the spdif section is locked to. Say if you wanted to record at 96k.

Thanks for the advice tekn0. I really like your idea of using one preamp to sorta glue all the mix together. Couple of problems I suppose, main one being I think I may be struggling to use the analogue output as I think I need to use my babyface analogue input to take my straight signal from the Kemper incase I do want to reamp at a future point. Also, in your opinion - is it advisable to recolour something already coloured by preamps? As far as I am aware, in the Kemper "profiling" process it captures the whole rig, so I think the pre used is part of the sound.

Am hopefully picking up a Great River next month, but was wondering if it was a good idea to feed the Kemper stuff through it, if it would give it all an extra kick etc or if it would just be overkill?

I came across this last night too

Lindy Audio Converter Analog / SPDIF - Thomann UK Cyberstore

Which I think would do the conversion job - just a case of me trying to clarify what cable out I exactly need from the Kemper now, it does not seem to be documented any where.
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Old 30th July 2012   #4
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well, first of all, yes, if you really want to go digital, you will ned a conversion box that translates from coax to optical
that should in therory not affect your sound, as there will be no conversion of the signal
something like that:
M-Audio CO2 Optical/Coax Con - Thomann UK Cyberstore

second, if you go analoge, you don´t need a mic-preamp, as the kemper sends out line-level signals

the great-river (wich is great by the way) is surely cool if you want to profile your amps, but for just playing with the kemper a preamp ist not needed

third: the lindy audio converter converts audio from analoge to digital...but you already have far superior converters in your babyface!!!!!
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Old 30th July 2012   #5
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Originally Posted by tenderboy View Post
well, first of all, yes, if you really want to go digital, you will ned a conversion box that translates from coax to optical
that should in therory not affect your sound, as there will be no conversion of the signal
something like that:
M-Audio CO2 Optical/Coax Con - Thomann UK Cyberstore

second, if you go analoge, you don´t need a mic-preamp, as the kemper sends out line-level signals

the great-river (wich is great by the way) is surely cool if you want to profile your amps, but for just playing with the kemper a preamp ist not needed

third: the lindy audio converter converts audio from analoge to digital...but you already have far superior converters in your babyface!!!!!
tenderboy, cheers for taking the time to help. I guess I am a bit fuzzy about the whole conversion box thing - I honestly naively thought I could just get the one cable going from the kemper to the babyface...

Looks like this may be a slightly more expensive business than I anticipated lol. I noticed on the kemper forum someone had mentioned the m audio CO2 but hadn't looked into it any further. Looks two way which seems helpful. Cheers for the suggestion. So I shall keep the TOS cable and pick up a coaxial digital cable like this:
Pro Video Digital Coaxial Audio Interconnect 1m : Digital Audio : Maplin Electronics

Does this box do the same sort of job as the m-audio? I can't see any mention of analogue conversion in it's description so assume it won't degrade through any conversion. I assume it's just converting I am after as opposed to conversion?

Coaxial to Optical Digital Signal Convertor : Digital Audio : Maplin Electronics

Once again, thanks for helping out.
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Old 31st July 2012   #6
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hi!

that should work i guess...if not, well, not a lotof money burnt

you don´t need a special digital coax cable, a normal coax should be just fine (the ones you use for linking your cd-player to your hifiamp)
the sssnake SRR2020 - Thomann UK Cyberstore

just use one side, (or use the other for connection your soundcard out to the kemper in for reamping...the m-audio box should be able to convert in booth ways...so that might be the better solution in the long run)

or just use the analogue in/out
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Old 31st July 2012   #7
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Originally Posted by tenderboy View Post
hi!

that should work i guess...if not, well, not a lotof money burnt

you don´t need a special digital coax cable, a normal coax should be just fine (the ones you use for linking your cd-player to your hifiamp)
the sssnake SRR2020 - Thomann UK Cyberstore

just use one side, (or use the other for connection your soundcard out to the kemper in for reamping...the m-audio box should be able to convert in booth ways...so that might be the better solution in the long run)

or just use the analogue in/out
that's brilliant, thanks so much, will just use a normal coax (pretty sure I have a whole head around) and will probably get the M audio Box. Thanks so much for taking the time out to help me, you are a star
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Old 22nd September 2012   #8
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did it work with any of these box?
I just bought the kemper and my audio interface is a Motu Track 16.
The kemper is spdif coaxial and my motu is optical!
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Old 23rd September 2012   #9
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RadioShack even sells a coax/optical converter for like less than $30.
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Old 3rd October 2012   #10
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Originally Posted by webstersp View Post
did it work with any of these box?
I just bought the kemper and my audio interface is a Motu Track 16.
The kemper is spdif coaxial and my motu is optical!
I've not had a chance to pick one up quite yet but the moment I do I shall pop back to this thread and pop up an update for any future reference.

If its of any help, I did come across someone on the official kemper forum using the m-audio co2 in conjunction with his rme ufx and he seemed to be getting on fine with the combination.

Sorry I couldn't shed much more light on the subject
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