Just installed an MB Quart 800.4 on a set of 6x8 coax speakers and no midbass..

[germanyt 10+ year member]

5 channel Diamond amp went out so replaced it with a 4 channel that can use 3 and 4 bridged for the sub. The sub isnt installed yet but the amp is hooked up with the low pass set at like 100 hz and there's very little output and only through the tweet. Its set on full range and the gain is maybe half way just messing around to get it set. Not sure what gives. I dont work with a lot of coax speakers but it cant be the speakers as they screamed on the 5 channel. I didnt have the vehicle here long enough to mess with the headunit settings but I found it strange. Any ideas?

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