Originally Posted by danimal
Thank you so much...have been waiting for this. One question from the unknowing here...by using a 150uF or 200uF, does that allow somewhat more bass than the 220uF to the speaker...and 270uF less bass? Just trying to figure out which way the numbers run for custom tailoring to individual likes.
Thanks again for coming up with this mod and posting for us.
Increasing the capacitance value will lower the cutoff frequency for a highpass filter and allow more bass through.
The formula for calculating the cutoff frequency is...
Fco = 1/(6.283 x R x C)
So for 220 uF capacitor and a 4 ohm speaker (I am guessing about the speaker)...
Fco = 1/(6.283 x 4 x .00022) = 181 Hz.
For a 270uF capacitor, Fco = 147 Hz.
Here's a link...
http://www.qrp.pops.net/filter1.htm