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Old 10th November 2009, 09:03 AM   #1
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Default Preamp response curve

I'm prototyping a preamp using a pair of OPA604's (buffer and gain stage) and I can't quite seem to get the response curve right. I first tried it with a perfectly flat curve and it sounded terrible and then with a shallow roll off that was -3db at 2kHz which sounded much better but still wasn't quite right.

Is there an industry standard frequency response for home audio gear? Or does anyone have any suggestions as to what the frequency response should look like?

Last edited by Oliphant; 10th November 2009 at 09:09 AM.
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Old 10th November 2009, 05:14 PM   #2
jcx is offline jcx  United States
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preamp for what source?
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Old 10th November 2009, 05:23 PM   #3
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It will be for a CD player and DVD player
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Old 10th November 2009, 05:39 PM   #4
AndrewT is offline AndrewT  Scotland
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i usually set the filters on power amps that have f-3dB @ 1.8Hz AND 200kHz.
I try for at least half an octave wider for a pre-amp, i.e <1.3Hz and ~300kHz.
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Old 10th November 2009, 05:47 PM   #5
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Thanks for the info Andrew. I originally tried it completely flat between 3HZ and 150kHz and it sounded completely wrong, which lead me to believe that recording studios must manipulate the sound so that high frequencies are louder by comparison.

Maybe I'll use my signal gen and oscilloscope to see how other hifi amps respond
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Old 12th November 2009, 05:48 AM   #6
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Update: embarrassing mistake, I had the filter backwards. Now with a filter that's -6db at 150kHz and the preamp sounds just fine
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