I have a stereo class D amp; one of its channels I am currently using to drive a custom made subwoofer. Now I want to make a low-pass filter for it. Searching the web I have found many different Op-Amp filters (and a big passive filter is not really an option). The problem is that my power source has some very dirty EMI, so I can't really use anything but a good class D for amplification.
Now my question is: is it possible to use one of the channels of the amplifier to amplify the filtered signal? In other words, what if I use a small passive RLC-filter, amplify it with one of the amplifier channels, filter it again with another RLC filter, and then feed the signal back to the other channel? Hoping to get some 4-pole filtering @100hz going. Will it work? What are your ideas?
For context, the amp is a standard gain 50W+50W (about 30 really) TPA3116D2 class D amp.
Now my question is: is it possible to use one of the channels of the amplifier to amplify the filtered signal? In other words, what if I use a small passive RLC-filter, amplify it with one of the amplifier channels, filter it again with another RLC filter, and then feed the signal back to the other channel? Hoping to get some 4-pole filtering @100hz going. Will it work? What are your ideas?
For context, the amp is a standard gain 50W+50W (about 30 really) TPA3116D2 class D amp.