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Calling all M^3 owners with Bass Boost! - Page 2

post #16 of 22
7/21/10 at 3:22pm
Thread Starter 

 

I mean the Cbb caps lol. This is a simulation of a non-shorting or break before make switch. That Cbb slot will momentarily be left open as if there is no cap there. That's why I asked. I really want to install a switch badly lol so when I bring it to a meet, everyone can adjust it to their preference and I can try it with other cans. But Ti thinks it could become unstable.

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post #17 of 22
7/21/10 at 4:49pm

Uhm... hence "adjustable bass boost". :)  The pot is for adjusting the level of bass-boost.  I'd imagine that if you momentarily have the caps out of the circuit, the volume may skyrocket depending on pot position, but I don't think it'll become unstable.  Now of course by wiring a switch in the feedback loop, making it A LOT longer of a loop, this may not be the best thing.

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post #18 of 22
7/21/10 at 5:44pm
Thread Starter 

 

Thanks for your help. A pot will adjust the gain, but increasing it will decrease the shelf and corner frequencies. If I wanted to increase the shelf and corner frequencies higher,I would either have to decrease the pot gain, which does only little, or decrease Cbb, which does a lot. With all else equal (R3: 2.55K, R4: 10.2K, Rbb: 50K), Cbb at .22uF is normally the sub-bass region. 0.15uF is the lower bass region, 0.1uF is the mid-upper bass region (punch), and 0.068uF covers the bass harmonics when I need to transcribe for bass players. A pot will do little, but adjust gain.

 

Seeing how making the loop longer will cause problems... I have no choice but to "roll" caps for the appropriate music and depending on the situation I use it for.

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post #19 of 22
7/22/10 at 7:12pm

 

I've built one M^3 and three PPA's all with bass boost. I settles on 0.18uF for the BB cap's. The 0.22 value was too subtle,

the 0.15 too much, and the 0.1 really muddied things up. FWIW.

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post #20 of 22
7/22/10 at 10:06pm
Thread Starter 

What headphones did you use with it? Are the caps by any chance the Vishay/BC brand? Wima doesn't have .18

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post #21 of 22
7/31/10 at 5:37pm

The .1 and .15 were Wima. The .18 was Vitamin Q from Beezar.

IMHO the Q's are an excellent/cheap choice for the BB.

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post #22 of 22
8/1/10 at 2:47am

x2 on 0.18 though to me at 0.22 the bassboost is pretty clear even if it's the k70x you're using. there're some songs I prefer no bassboost.

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