That will only work with a tape monitor function. That allows one to hear what’s being recorded from the deck rather than the source. Without that function, you never get the equalizer into the audio loop. The kenwood doesn’t have that function.

Ah. I misread. That’s a tall order. 2 in 4 out is quite common. Anything more for inputs is extremely rare. In fact I’ve never heard of one.

https://www.primecables.ca/p-358966-cab-9995-monoprice-4-channel-speaker-selector#sku368072

That kenwood receiver will not work with the 901 equalizer. Allthough it has tape inputs, it does not have a tape monitor function. Without a tape monitor function you don’t get the equalizer into the audio playback loop.