|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
207.200.116.196
i have a solid state amp which has an input impedance of 35K ohms.
the amp has a 100 microfarad 16 volt nonpolar electrolytic capacitor directly in series with the input rca jack, i assume this is to stop any dc from entering the amp circuit. i would like to replace this
cap in order to improve the sound of the amp. space on the circuit board is limited. what should i do
a)nothing
b)bypass with a small film cap
c)replace with a black gate
d)replace with a 2.2 microfarad film cap (it will barely fit)
I am concerned that the 2.2 cap might cause a rolloff of bass frequencies.
Follow Ups:
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,
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.
This post is made possible by the generous support of people like you and our sponsors: