Amp/Preamp Asylum

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Also, perhaps a high pass filter may help

Posted by 3+4=5 on March 18, 2017 at 13:06:11:
The frequencies you want to use may not include very low frequencies.
Low frequencies use the most power from an amplifier.

If you found the 'bottom' frequency your sounds need to be good sounding.. and filter out all the sound below the select frequencies. High pass filters are easy to implement, and not very expensive. It would be before the amplifier.
So the amp would no longer be amplifying low frequency crap (which you do not want, and which muddy up the sound anyway)
This alone would also give you more apparent power, as the amp is no longer amplifying worthless low frequency noise.