Powered subwoofer level way too low!

[35cents]

My setup is a 2001 Audi A6 with a JVC KD-XBT50 media player (50W X 4), JBL GTO628 in the front doors and a Rockford P300-10 powered sub (300W) in the trunk. The head unit works flawlessly with the JBLs and sounds fantastic - the problem is with the sub, which I just added. It runs off of the low level of the head unit, and has good power and ground. The output level is extremely low, even with the gain and boost cranked pretty far up on the amp. The back seat is down - with the back seat up you cannot even hear the sub. I have to back the fader way off of the front channel to try to even the sound. Can there be this much of a efficiency difference between the front speakers and the sub? I've fiddled with the crossover, deck adjustments, etc. On the deck, the front speakers are blasting at 20 volume - even with the fader adjusted several notches to the rear, the bass really doesn't come through until you hit 25-27. I know these are just numbers, but it represents a huge volume difference. What am I missing?

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[phatredpt 10+ year member]

Does the head unit have a menu item to adjust the "subwoofer" output or whatever the jacks are that you connected to??

You said low level so I assume you connected to RCA jacks on the back of the head unit?

 

[pickup1 5,000+ posts]

Is there a reverse phase on the deck or sub?

 

[35cents]

Yes, I have switched the deck from rear RCA full-range to sub-out, with no results - the level was even lower. There is a phase switch on the sub, same result. I will say I am using the factory wiring for the low level, but I can't imagine that their would be much signal drop though.

 

[winkychevelle 10+ year member]

There is a switch on the amp on the box that goes from high level to low level inputs. Swap the switch around.

My gain knob on minr had to be up quite a bit to actually make power. The amp is running at .5ohm so if your voltage drops be careful. My amp still performs fine even after I ran it at .25 on a quad 1 mojo. Though I dont think it would last long at that ohm load it started getting hot rather quickly