How to connect jamo e7 sub to Harman Kardon HK 680 amp

Aug 15, 2018
I have Harman Kardon HK 680 and when I comnect amp pre out to Jamo e7 subwoofer sound is to low. How to connecr subwoofer to HK 680? I tried rca to rca because is mono,1 rca to 1 rca, not Y rca. Pre out amp to Jamo E7. hk 680 back jamo e7 back

I also connect to tape out end the sound was ok but correction of laudnes only goes from SUB. And I alweys mast chek corect out button.
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