DPA UA0777 Nose Cone - Page 2

Brian Peters · 1st March 2011

Tips of the mics pointing forward using the HF rise to good use. That's why I say the cones are for intermediate distance use. You can be farther back in the transition from direct to reverberate with these, other wise you may want the silver grids . They now have the trapezoid style grids too. We did try the balls but settled on the cones as best choice. We put the balls in the sound instead.

BP

Kees de Visser · 2nd March 2011

I've put a few frequency plots on my website that you might find interesting. These were made with a 4006+nosecone at 0° and 90° angle.

I find these easier to read than the (normalized) nosecone polar pattern from the DPA website:

(sorry for the large images, I couldn't find a way to reduce them in this post)

Tom McC · 4th March 2011

Kees, is the wording correct for your two graph legends?

Should it not read something like:
"Free Field Response at 0° (i.e. on-axis)", instead of: "On-axis Free Field Response at 0°"
and
"Free Field Response at 90° off-axis", instead of: "On-axis Free Field Response at 90°"

Or maybe I've misunderstood something..

Kees de Visser · 6th March 2011

You are right of course ! The plots were made on standard DPA Calibration Chart paper which has the text pre-printed. The 90° version was made on my special (informal) request.

JEGG · 6th March 2011

Quote:

Originally Posted by Kees de Visser

You are right of course ! The plots were made on standard DPA Calibration Chart paper which has the text pre-printed. The 90° version was made on my special (informal) request.

That's what I assumed, but this gives me the chance to say "thank you very much!" Most informative.

saf34 · 12th March 2011

Quote:

Originally Posted by Kees de Visser

I've put a few frequency plots on my website that you might find interesting. These were made with a 4006+nosecone at 0° and 90° angle.

Kees, very interesting graphs indeed. Do you, by any chance, have the underlying data or a pdf of the graphs?

I like playing around with freq responses in MatLab you see...

Kees de Visser · 13th March 2011

I don't have the raw data, but you might be able to find the approximate values from the graph. Don't overestimate the precision though, since every mic will have its unique graph (within small margins, it's DPA after all

)
Can MatLab convert graphs to data ? Apparently there are utilities like "Dagra Graph Digitizer".
In theory it's possible to use dsp to match the curves between mics, but for one angle of incidence only. That would probably be the end of "matched pair" marketing.
It would be interesting if you could convert (DPA or other) graphs into dsp (EQ) data. Count me in

2nd March 2011	#32
Kees de Visser Gear maniac Joined: Dec 2006 Location: France Posts: 158	DPA4006+nosecone freq.plots I've put a few frequency plots on my website that you might find interesting. These were made with a 4006+nosecone at 0° and 90° angle. I find these easier to read than the (normalized) nosecone polar pattern from the DPA website: (sorry for the large images, I couldn't find a way to reduce them in this post) __________________ Kees de Visser Galaxy Classics

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1st March 2011	#31
Brian Peters Gear interested Joined: Jun 2009 Location: Cohoes, NY Posts: 8	Tips of the mics pointing forward using the HF rise to good use. That's why I say the cones are for intermediate distance use. You can be farther back in the transition from direct to reverberate with these, other wise you may want the silver grids . They now have the trapezoid style grids too. We did try the balls but settled on the cones as best choice. We put the balls in the sound instead. BP

4th March 2011	#33
Tom McC Gear nut Joined: Apr 2009 Posts: 123	Kees, is the wording correct for your two graph legends? Should it not read something like: "Free Field Response at 0° (i.e. on-axis)", instead of: "On-axis Free Field Response at 0°" and "Free Field Response at 90° off-axis", instead of: "On-axis Free Field Response at 90°" Or maybe I've misunderstood something..

6th March 2011	#34
Kees de Visser Gear maniac Joined: Dec 2006 Location: France Posts: 158	You are right of course ! The plots were made on standard DPA Calibration Chart paper which has the text pre-printed. The 90° version was made on my special (informal) request.

13th March 2011	#37
Kees de Visser Gear maniac Joined: Dec 2006 Location: France Posts: 158	I don't have the raw data, but you might be able to find the approximate values from the graph. Don't overestimate the precision though, since every mic will have its unique graph (within small margins, it's DPA after all ) Can MatLab convert graphs to data ? Apparently there are utilities like "Dagra Graph Digitizer". In theory it's possible to use dsp to match the curves between mics, but for one angle of incidence only. That would probably be the end of "matched pair" marketing. It would be interesting if you could convert (DPA or other) graphs into dsp (EQ) data. Count me in