Subwoofer inconsistency

[Jacob Pierznik]

I have a 2007 Honda accord with subs that will play loud sometimes and other times not perform well. I noticed that it will fix itself sometimes if I turn the car off and back on. The car is on the stock alt and it is a load sensing alternator so could It be that and if I get a high output alternator will it always give full voltage?

I do also have some electrical interference noise that is very quiet cause the first shop that ran the wires ran the power wire next to the RCAS.

Setup
Rockford fosgate p3 2x12
Skar 800w monoblock amp( I am getting a bigger one)
Big 3 kit
Shirkuen bt-60 1500w main battery
Kenwood dmx-809s

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[huberoy123 10+ year member]

Run a test, using a meter, to see if your power decreases when you turn the volume up. If it does, your thoughts on the alternator may be correct. I would run a new power wire on the other side to address the electrical interference issue. Just disconnect the old one. Let us know how you resolved your issues. Good luck.

 

[1aespinoza 10+ year member]

have a 2007 Honda accord with subs that will play loud sometimes and other times not perform well.

If using the OEM radio, it may have Auto Volume Level. That will randomly lower audio output.

 

[RobGMN 5,000+ posts]

Are you talking with the exact same music playing before and after you restart the car?

Varying levels on the exact same music are from (as you suspect) a voltage drop. But, the trick is finding WHERE.
It could be you main power source. It could be your head unit. it could be the wiring in between. it could be a dirty potenbtiometer in the amp. Fialing voice coil in the speaker.

You literally have to prove each part of the chain works to find out which part is bad.

As was said, start with the main power supply, and work across each possibility.
Gremilins can be a b*tch.

 

[ThxOne Premium Member]

Well it is an eXcelon head unit so RCA voltage is good and solid. What size cables are you using for power and ground?

 

[Popwarhomie 5,000+ posts]

Hook up a volt meter. I would guess it's voltage drop from the Honda ELD voltage regulating setup.