I recently came across a CFD-V20 in great condition. I added a Bluetooth module which works great. When I did some testing to see what the "Mega Bass" button does, I was disappointed. I changed 2 capacitors to improve the low end but I would like to change the curve a little so the boost is at a lower frequency range. I found a service manual but I don't quite understand how it works. It looks like the boost is somewhere other than the mega bass board and the button cancels it by way of the board.
