No changes were made to the headunit or battery during the down time (appx 4 weeks). The amp's gain settings are exactly where they were when the system was uninstalled and the RCA plugs and input wiring for the sub are in the same spot. The sub is reacting to the music, but incredibly weakly.

I just checked all the connections at the back of the headunit and inside my box. Everything is tight and well connected. I installed new wire from the amp to the sub just to make sure that wasn't the issue. No go

Anybody who can help, it would be much appreciated.

I've got a Pioneer 5600 deck, Pioneer 400 watt 4-way amp and a Pioneer 10 inch subwoofer. The sub is bridged on the amp's B channel. It hit like mad before, now I've got nothing. So sad

 

is it possible the wiring into the sub got reversed? try reversing the + and - leads and see if that helps.

 

Turn up the bass on your headunit? Also try checking all the connections again, just to make sure nothing got messed up.

Was the sub in a different car before? Subs sound louder in bigger cars like SUVs I think it's because there is more air space or something like that.

 

The bass settings on my headunit didn't budge from the first time. The system has only ever been in my hatchback, so it's not "imagined" loss of sound. I also already tried reversing polarities

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kkim &raquo;</TD></TR><TR><TD CLASS="quote">is it possible the wiring into the sub got reversed? try reversing the + and - leads and see if that helps.</TD></TR></TABLE>

This would really only have an impact if you're running two subs and they were wired opposite of each other... but a good thought.

Did you do anything to upgrade your highs? Alot of people will put new speakers in with better highs, or amp them, and imagine a bass loss when it was just an increase in treble and mids.

The other option is maybe the amp is getting older/weaker, or the sub its self. Bridge your sub off of the front channel sets and see if the volume increases any. If so, then obviously it's something with the rear channel on your amp. If not, see if someone has a similiar sub and if there is an increase in volume. if so your sub is most likely at fault.

 

Sub is bridged, highs and mids have been upgraded for a long time, all wiring has been rechecked and redone, gain settings are fine, the amp is brand new and has been used for a total of about 1 week. The amp is getting and distributing signal just fine. The only question is where the weak signal is coming from.

I guess I'll take my headunit out and redo the wiring. PITA, but a sure fire way to remedy the situation.

By the way, a Pioneer 10-inch sub is plenty of bass for a civic hatchback. I don't need a "real" sub because I'm not trying to win a competition or boil the brains out of my head. The only reason I have it is to round out my sound system. I travel a lot and highs and mids get old after a while.

 

One sub is great, saves weight if you just wanted to fill in a hole where there was no sound before. There is no need to rewire your head unit. It did not rewire itself incorrectly when you weren't looking. You have a 4-channel amp brigged on one sub. If i remember correctly (getting old), Pioneer has a very poorly marked end plate. There are 2 pairs of inputs and one pair of outputs (to go to another amp). Make sure you are plugged into the right ones. If you are then (with the stereo playing) unplug each of the inputs one at a time (pull the left, put it back, pull the right, put it back). If the sound changed each time then the signal is good. If it did not change when you pulled one of the plugs, then it is either plugged in the wrong spot or is not supplying any signal.