So, I'm looking at the attached, which is the input stage to a small Ampeg bass guitar amplifier that in my opinion sounds pretty good. The stage after it is a Baxendall-style tone control, and then it goes right into the power amp/output stage which is nothing special, so my theory is that this stage must be what makes the amp sound a cut above other small bass amps I've heard. I could be totally wrong about that, but I'd like to figure out what's going on here, either way. At first I thought it was a variation on a Sallen-Key filter, then it kinda looked like an MFB topology, then I started getting a headache and decided to post here.
If I HAD to stick a guess to the wall, it's a HIGH pass filter that has a big Q hump at a low frequency so that it counter-intuitively boosts BASS, but I still don't know exactly why it's executed the way it is, here. Any insight is very welcome!
If I HAD to stick a guess to the wall, it's a HIGH pass filter that has a big Q hump at a low frequency so that it counter-intuitively boosts BASS, but I still don't know exactly why it's executed the way it is, here. Any insight is very welcome!
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