Sub is louder with only 1 rca?

[lilpride 10+ year member]

Ok so I installed a polk 1100.5 amplifier in a car. its running of a LOC.

Whenever I hook rcas up to the sub channel it gets weird.

For some reason the sub is twice as loud when only one rca is hooked up. It doesn't matter which rca or wich rca jack on the amp. But when both are connected the sub hits not nearly as hard.

Any ideas why?

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[lilpride 10+ year member]

ttt

 

[jco1385 5,000+ posts]

i could be wrong (never worked with LOCs) but it seems you are splitting the RCA voltage and that's why it's lower. If it's a mono amp, you only need one anyways.

 

[Pataforce8 10+ year member]

One of your LOC is wired backwards. When both RCAs are hooked up, the signals are opposite and canceling each other out. Try switching the wiring on one and see if that fixes it.

 

[kylediablo 10+ year member]

out of phase switch one of the positives and negatives

 

[lilpride 10+ year member]

I will try this as soon as I get home Thanks for advice.