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OPA2134 Stability
OPA2134 Stability
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Old 23rd March 2021, 11:12 PM   #121
jean-paul is offline jean-paul  Netherlands
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Join Date: Sep 2002
Location: Germany
Originally Posted by dotneck335 View Post
If you've got DC on ANY pot, something's not right......
Mmm, I would overthink that one
It's only audio. Member of the non modular PCB design committee
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Old 27th March 2021, 06:34 AM   #122
Fast Eddie D is offline Fast Eddie D  United States
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Preliminary listening tests seem to indicate that the prototype is for all practical purposes sonically transparent. On my tape monitor, with the prototype powered with 9 volt batteries, I could not hear a difference. And there are no nasty habits.

I will install the prototype into my preamp and listen to it for a while. If it works out, then I will build a 40 Hz version for my 8" two ways and see how that works.
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Old 30th March 2021, 03:48 PM   #123
Fast Eddie D is offline Fast Eddie D  United States
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After listening to this for a few days I must say that it works very well. It adds nothing but it does get rid of the subsonic trash. All my poles are 1.6 Hz or 3.2 Hz so without a filter like this the subsonic trash comes right through to the speakers. And there's a lot of it on some CDs and on streaming and MP3 music too.

This really improved my 8" two ways a lot, and I'm hoping that a 40 Hz version will work better. The speakers are electronically compensated for bass response (shelving equalizer +3dB@80 Hz and +5 dB at 40 Hz) so unwanted low frequencies are boosted. The party's over at 40 Hz so I'm thinking that a 40 Hz high pass filter like this will allow more dynamic range and higher max spl. The 20 Hz version will go in my biamp, which will drive subwoofers and satellites.
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