Howdy, I have not done a car audio install since the mid 90's, but I used to do quite a few. My girlfriend decided that she wanted a little thump in her 09 Mazda 3, and I found some used equipment cheap from my cousin, and bought it to install for her, however I am having a weird issue I was hoping for help with.
First, here is the setup:
- 09 Mazda 3 stock (non bose) head unit.
- Line out converter (either the wiring diagrams I found were backwards, or I read it backwards, but the LOC is tapped to the front speakers instead of the rear for now.)
- Pioneer GM-5500t (it is running bridged)
- 12in Kicker CompS sub in a sealed enclosure
After much struggling and cursing, I got the power, amp remote, and RCA cables run and tucked in. I also had to find a good ground when EVERYTHING in the **** trunk is painted/coated/covered in some way, and I only had a short ground wire.
As it stands it plays, and the grounding is good as I have no clicks/whine with the motor on. I was very happy about this!
The amp has the built-in lowpass crossover on and set at ~250hz.
The problem is this. The bass is extremely weak. If I adjust the balance all the way to the left or right, it thumps, but in the middle it is very weak. Now from past experience (at least with non-bridged setups) between any two speakers on opposite channels (l/r or front/rear), if adjusting to one of the speakers increased the volume, it was a phase problem. Either a speaker was wired in revers polarity or the input signal on one channel was reversed somehow.
- At any rate, thinking it may be a phase issue, this is what I have tried, and the results:
- Reverse the input polarity of one side of the LOC (No change)
- Remove one RCA (still weak in the middle, when balanced to the removed side no sub, to the other side it rocks).
- Reversed the polarity of the sub (I have not been in the box so it could have been wired wrong, so I reversed it at the amp, thinking maybe it is out of phase with the rest of the speakers somehow- but also knowing if it was, balance adjustments shouldn't make it louder) (Results, no change)
There are a couple of other things I could try, but my mind is saying they will have no difference, and that is, reverse the inputs to -both- left and right on the LOC, wire the LOC to the rear speaker outputs.
I feel like in my lack of recent experience I am missing something very simple but I do not know what. Any help is much appreciated, as I am getting very frustrated with this.