The W91A equalizer is one of the later developed. It was designed in the early 1990´s when customers requested for more channels with full features. All circuitry for the W91A’s is high quality and build after the standards of the IRT (Institut für Rundfunk Technik). The idea behind the W91A equalizer was to build a balanced eq module in a small, half fader (B1) cassette. The W91A is quit flexible and a good alrounder featuring with selectable frequencies and a q-factor. You can use the the W91A for mixing and mastering. The W91A is a flexible eq with a relatively clean yet slightly aggressive character. It´s ability to go from subtle filtering to extreme EQ-ing effects, makes the W91A a very powerful tool. The sound is much more “in the face” and you can still add loads of high frequencies without getting any harshness. Punchy!