Re: [LAD] HDSP 9652 and Behringer ADA8000

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To: <linux-audio-dev@...>
Date: Thursday, March 29, 2012 - 4:31 pm

On Thu, Mar 29, 2012 at 02:27:42PM +0200, Adrian Knoth wrote:

> Yes, ADA8000 is based on Alesis (now WaveFront Semiconductors) A/D

Which (the appnote) does not include the mic preamp. Strangely
enough the ADA8000 preamp has a very good noise figure if used
at maximum gain (real max, not just close). It gets very bad
once gain is reduced. That is due to *bad design*, you can
predict this (without even doing any calculation) by just
looking at the circuit diagram. And the line input is just an
attenuator feeding the mic preamp. I don't think all that is
a copy of anything RME.

Apart from that, 50,150,250 Hz hum levels increase from left
to right (i.e. as you get closer to the power supply). Which
gets hot enough to fry some eggs if you take 5 mA of phantom
power from each input.

Ciao,

--
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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Messages in current thread:
[LAD] HDSP 9652 and Behringer ADA8000, Phil T, (Tue Mar 27, 11:44 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Fons Adriaensen, (Wed Mar 28, 9:03 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Adrian Knoth, (Wed Mar 28, 9:26 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Giso Grimm, (Wed Mar 28, 9:42 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Giso Grimm, (Thu Mar 29, 7:09 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Fons Adriaensen, (Thu Mar 29, 8:28 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Giso Grimm, (Thu Mar 29, 8:52 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Fons Adriaensen, (Thu Mar 29, 9:23 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Adrian Knoth, (Thu Mar 29, 7:37 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Adrian Knoth, (Thu Mar 29, 12:27 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Fons Adriaensen, (Thu Mar 29, 4:44 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Fons Adriaensen, (Thu Mar 29, 4:31 pm)
Re: [LAD] HDSP 9652 and Behringer ADA8000, Christoph Kuhr, (Wed Mar 28, 9:36 am)