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Old 15th February 2012, 05:02 AM   #1
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Default upgrade CD output caps

I want to replace my CD's output caps (47uF/50V) with film MKP ones. Could anyone help me what value is suitable for these caps. Will small value of film caps give the sound less bass?
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Old 15th February 2012, 05:51 AM   #2
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Yes.
Paralel smaller ones with what you have.
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Old 15th February 2012, 07:23 AM   #3
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You need to confirm the total load on the output to predict how changes to cap value will impact on bass. To do this find the input impedance of the amplifier (or whatever your connecting to) and also the value of any resistor to ground after the output coupling cap in the CD player (often there is a 100K or similar resistor after the cap to drain charge down).

Once you know the total load you can use this online calculator to predict the -3dB point of a given capacitor value: Coupling Capacitor Calculator by V-Cap

Aim for a cap big enough to reduce the -3dB frequency below 2Hz. Increasing the cap value beyond that won't make any audible difference to bass response.

Unless you have a very low input impedance at your amplifier I suspect that a cap value of <10uF will be fine, allowing you to use one film cap (rather than a small film cap bypassing a bigger electrolytic).
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Old 15th February 2012, 07:26 AM   #4
Mooly is offline Mooly  United Kingdom
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What's the player ?

If the overall cap value is smaller than 47uF then bass is less all other things being equal (meaning the impedance of whatever is connected to the output of the player).
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Old 15th February 2012, 04:30 PM   #5
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For heaven's sake, just take a DC voltage reading on both sides of each cap with player running. If you have 0V DC within 100mV or so +/-, then NO CAP is the best sounding solution, i.e., just replace each cap with a jumper wire.
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Old 15th February 2012, 08:47 PM   #6
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That makes zero practical difference. I tested it with persons that where convinced that can "hear" the capacitors (parallel like said above) and they failed to go above 50% guesses.
I used four wires with a dual switch to test.
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Old 15th February 2012, 11:54 PM   #7
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Quote:
Originally Posted by sharpi31 View Post
You need to confirm the total load on the output to predict how changes to cap value will impact on bass. To do this find the input impedance of the amplifier (or whatever your connecting to) and also the value of any resistor to ground after the output coupling cap in the CD player (often there is a 100K or similar resistor after the cap to drain charge down).

Once you know the total load you can use this online calculator to predict the -3dB point of a given capacitor value: Coupling Capacitor Calculator by V-Cap

Aim for a cap big enough to reduce the -3dB frequency below 2Hz. Increasing the cap value beyond that won't make any audible difference to bass response.

Unless you have a very low input impedance at your amplifier I suspect that a cap value of <10uF will be fine, allowing you to use one film cap (rather than a small film cap bypassing a bigger electrolytic).
Dear sharpi31
The input impedance of the amplifier is 47Kohm and if I choose -3db corner frequency of 2Hz as recommended in Vcap article, then the optimal cap value should be 1.69uF. Is that right? And if so I would choose 1.8uF for my caps?

Last edited by ngovanhinh; 16th February 2012 at 12:13 AM.
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Old 15th February 2012, 11:57 PM   #8
SY is offline SY  United States
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That sounds right. A 47u film cap will be quite large and both its size and the necessity of long leads may well actually degrade the player's performance. A 2.2uF cap should be adequate if you have a 47k load.
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Old 16th February 2012, 12:15 AM   #9
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Originally Posted by SY View Post
That sounds right. A 47u film cap will be quite large and both its size and the necessity of long leads may well actually degrade the player's performance. A 2.2uF cap should be adequate if you have a 47k load.
Maybe I'll get 2.2uF caps for replacement as you suggested. Thanks
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Old 6th August 2012, 08:45 AM   #10
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I have chosen 2.2 mundorf mkp as replacement and the result is better. The question is why did the manufacture choose the 47uF electrolytic capacitors for output not 2.2uf electrolytic ones or 2.2uf film ones for better? By the way, my cd player is Kenwood dp-7050
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