bezz
Member
I don't think that a filter being active or passive accurately reflects the quality of the output signal. If one is designed and suited better to the application than the other, then it will sound better. However, both can be used to perform the same task, and I'd recommend going down the active route using op amps, due to the reasons I mentioned above. A good starting point to get a better overview would be these wiki articles:
Active filter - Wikipedia, the free encyclopedia
Sallen?Key topology - Wikipedia, the free encyclopedia
Active filter - Wikipedia, the free encyclopedia
Sallen?Key topology - Wikipedia, the free encyclopedia