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In Reply to: amplifier input capacitance posted by tubelover@aol.com on April 15, 2007 at 17:55:31:
You're correct ... that cap seems to be a coupling cap, whose purpose is to block any DC offset from entering the amp. Replace it with a 100uF BG non-polar ('N' or 'NX') if you can get them, for better sound.BTW, 100uF is IME a huge value but the bigger the coupling cap, the lower the bass extends ... so replacing it with only 2.2uF might be detrimental?
There are equations to calculate the roll-off frequency but you need an expert to advise you on this.
Regards,
Follow Ups:
isn't there someone out there who can tell me if using the 2.2 microfarad cap will result in a rolloff that will not harm bass frequencies above 20hz ?
Just look here:http://www.audioasylum.com/audio/tweaks/messages/143426.html
thanks DynaMite the formula says with a 35K ohms impedance a 2.2 microfarad cap will yield a bass cutoff around 2 hz. this is aceptable to me.
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