I would think that to have a 20 band eq, you'd only be able to have a mono output... I'm guessing this from the current setup :- 4 channels of 5 band eq for front and rear stereo output 2 channels of 10 band eq for stereo output Jazz (List 112, Mk2 12 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)