Equalizer APO

Equalizer APO is a parametric equalizer for Windows. It is implemented as an Audio Processing Object (APO) for the system effect infrastructure
introduced with Windows Vista.





Features:
- virtually unlimited number of filters (currently limited to 100 per channel for sanity)
- works on any number of channels
- very low latency, which makes it suited for interactive applications
- low cpu usage

Requirements:
- Windows Vista or later (currently only Windows 7, 8 and 8.1 have been tested)
- Sound card driver must support APOs (this includes most onboard sound drivers)
- The application must not bypass the system effect infrastructure
(possible by using special APIs like ASIO)

http://sourceforge.net/projects/equalizerapo/


Update 17. aug. 2014: 
GUI for Equalizer APO i recommend EQ31GUI-2

Get EQ31GUI-2 here: 
http://jiiteepee.tripod.com/eq31gui-2.html