Bi-amping sends the frequencies to each band, based on the design and settings. Some active crossovers have more than two bands and can work in a much more complex system, but the principals are the same.
What do you mean, by "Quasi Active biamping"? It's active, or it's not.
If this applies to your subwoofer, you can set its crossover to the highest frequency, but the outboard crossover will need to be set to a usable frequency so the sub does what it's supposed to, but doesn't receive frequencies that it doesn't need to produce. BTW- if it's actually a subwoofer, 120Hz is too high unless the satellite/main speakers are very small and can't produce much below that. In this case, I would recommend improving the main speakers, so the mid-bass is good enough to be satisfying on its own, without a sub, then add the low end that extends the range without making it obvious. Speakers that produce weak mid-bass make an audio system sound very anemic and it's very difficult to get it right through equalization because at some point, the speakers can't handle the amount of boost that usually comes from using an equalizer to fix problems that are inherent in the speakers. It won't make the speakers better.
If the photo shows the back of the equalizer that you have, there's no Low pass band, so it's always sending every frequency to the subwoofer unless you drop everything above the point where you want it to work and that causes terrible problems with the sound via phase shift.
Numark EQ 2600 10 Band Stereo Graphic Equalizer with Spectrum & VU Display For Pro or Home Studio Work or Audiophile Audio System This is a great little EQ unit that was built in Japan and which is very useful for shaping the tone for listening, recording, or dubbing, at home or...
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