OPA2134 Stability - Page 13

jean-paul · 23rd March 2021, 11:12 PM

Quote:

Originally Posted by dotneck335

If you've got DC on ANY pot, something's not right......

Mmm, I would overthink that one

Fast Eddie D · 27th March 2021, 06:34 AM

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.

Fast Eddie D · 30th March 2021, 03:48 PM

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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27th March 2021, 06:34 AM	#122
Fast Eddie D diyAudio Member Join Date: May 2010 Location: Skokie Il	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.

30th March 2021, 03:48 PM	#123
Fast Eddie D diyAudio Member Join Date: May 2010 Location: Skokie Il	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.