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I have never had a problem making any adjustment but I've only made small changes so it could be subjective. Ill do a big change tomorrow to see if I can tell.
One of the reviews of the DQ61 says that when you use the summing feature, you lose the eq tuning. Is that true?
So I made some adjustments on the main channel this morning and noticed a difference then I made the same adjustments on channel 2 and didn't notice anything. But that all makes sense to me, once you sum, the main channel EQ handles anything summed. To say that you lose EQ is incorrect maybe the reviewer got confused.
My set up takes the tweet and front door signals and sums them for my front and rear speaker signals then I used the rear speaker signals for my subs.