fredmr39

I get VERY minimal sound from my new HU out of the subwoofer pre-out. I'm positive all crossover settings/etc are correct, and with amother HU, the sub plays normal volume so the problem seems to be limited to the HU itself.

I know the HU I bought new has caused problems for others right out of the box with poorly grounded internal RCAs -- but usually that just leads to noise...

pentavolvo

poor rca ground would have alt wine liek u wouldnt believe

make sure sub level is all the way up +6

fredmr39

it is -- even at 0, I would imagine some sort of a response more than what I'm getting considering the range is -12 to +6, I believe. When I say I hardly get a response, I mean you have to touch the sub or rest your ear on it to hear anything.

I like how I've upgraded 100% of my system within the past 6 months and I continue to have problems.

fredmr39

trield old HU again to make sure I'm not crazy -- everything sounds perfect then... also tried using front RCAs on sub with the HPF off since I know those RCAs work perfectly fine for the components amp, but I got the same results.

I'm not sure what to do at this point..

ultraz

iTrader: (4)

sounds like a blown preout on the deck.

fredmr39

That's what I was beginning to think, but I had similar results when using preouts known to work (fronts) and turning off all filters...

Anyways, it's a lot better now. I reset the HU, turned the sub pre-out up to its full outut, set all amp gains again, let the HU do it's AUTO EQ thing, and got much different (better) results than before.

Richiec77

iTrader: (3)

No. Loosing ground only means you'll loose signal isolation and noise rejection abilities. I.E. you'll have alternator whine and other noise issues. Not a loss of sound. The signal traveling across the center conductor is AC so you won't loose sound, just the stuff above.