[rookiest]

I want to tune my Bass Boost, so i need your capacity recommendation.

Please do not say that only experiments will do.

Beside, using nice film capacitor for them(Moondorf, musicap, RTX multicap..) can be a good choice?

 

[morsel]

I haven't rewritten the PPA bass boost documentation yet, but check out the M³ bass boost section: http://elvencraft.com/mmm/ The new calculator is up.

Av = gain with no bass boost; Rbb = 0Ω
Abb = gain of bass boost; XCbb >> Rbb; does not include Av
ƒs = shelving frequency; 3dB below Abb
ƒc = corner frequency; 3dB above Av

for R3 = 1kΩ, R4 = 10kΩ, Rbb = 33kΩ, Cbb = .22µF
Av = 11 (20.8dB), Abb = 4 (12dB), ƒs = 23.4Hz, ƒc = 82Hz

 

[BradJudy]

If you haven't seen it, check out the bass boost calculator on Tangent's site: http://tangentsoft.net/audio/ppa/amp/calc.html

Personally, I wouldn't go any smaller than .2uF. I actually bought about 5 different sizes of caps and tried them out. I think I ended up somewhere near .25uF, but I would have to check. Whenever I get around to clearing stuff out, I'll set some bass boost experimenting sets of caps.

 

[tangent]

Quote:

Please do not say that only experiments will do.

Why not? This is a subjective filter. There is no "truth" here. Only you can judge which "lie" you want to hear.

Quote:

check out the bass boost calculator on Tangent's site

That still uses the old function, which breaks down at low gains. It will use the new formula that SnoopyRocks came up with eventually, but not right now.