Implement highpass filter for small speakers even without subwoofer
Submitted by Alexander E. Patrakov
Assigned to pul..@..op.org
Description
PulseAudio already has a crossover filter that sends low frequencies (that the main speakers cannot reproduce) to a subwoofer.
There are at least two people (myself and bryak from linux.org.ru) who want a similar feature that does the same filtering, but throws low frequencies away instead of delivering them to a subwoofer. The problem is that small speakers, when given low-frequency content, not only fail to reproduce it, but also let it distort mid-range content (i.e. exhibit intermodulation distortions).
This feature is already widely implemented by Canton (a speaker manufacturer) in their hardware, they call it "Displacement Control".