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Bass boost question for a Cmoy.

post #1 of 5
10/16/10 at 10:07pm
Thread Starter 

Hi. I have finished rebuilding my Cmoy recently and I would like to add an adjustible bass boost or a switch based one to my cmoy, but got several questions, First of I looked at this schematic 

http://www.headphoneamp.co.kr/bbs/zboard.php?id=diy_member_new&page=5&sn1=&divpage=1&sn=off&ss=on&sc=on&keyword=PPA&select_arrange=headnum&desc=asc&no=1325

But I cant figure out how to connect it into my Cmoy, I understand that the resistor (i will start with 47k)  and cap (.1uF)  goes in siries with the R4 position on the tangent schematic and then goes straight to the output, but what is the line from the BUF 634 suppose to be? Is it connection to the positive and negative side of the power supply on the cmoy? or is connected to ground?  

 

Thanks. Also what would be a good adjustable pot for bass boost? 

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post #2 of 5
10/16/10 at 10:24pm

Thats a MINT amplifier not as simple as a cmoy, this what you need for a cmoy

 

cmoy_bass.jpg

 

cheers

FRED

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post #3 of 5
10/16/10 at 11:08pm
Thread Starter 

OK so it sits in siries with the  R4 if im reading the circute correctly. Whats a good small  adjustable pot that goes to 50-100k? And how does the cap size as well as resistance affect the bass boost? 


Edited by soviet911 - 10/16/10 at 11:46pm
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post #4 of 5
10/17/10 at 12:24am

A 50K log pot will do the job, and have a look at the bass boost calculator on AMB's site and you can see how the different values change the profile

 

http://www.amb.org/audio/mmm/

 

cheers

FRED

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post #5 of 5
10/17/10 at 2:36am
Thread Starter 

Thanks. I will go with .1uf cap and 50k pot as at max it bump up the frequencies below 40hz by almost 20db and frequencies of 200hz by 5 db....on max. what are good brands for kpots?

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