I owned a B&K EX4420 at the same time as the Reference 4430(3 channel) and the EX4420 seemed to have a bit more punch and refinement due to it being biased more class A or because it was a 2 channel amp vs 3 channel. Not sure the reason though but that is what I experienced.
Both the EX4420 and REF 4420 are probably 95% the same amp mainly cosmetic from what I can tell.
Bill
Both the EX4420 and REF 4420 are probably 95% the same amp mainly cosmetic from what I can tell.
Bill