Help! Subwoofer won't work

TheMagZ

So my amplifier turns on but my subwoofer does not make any sound. Here's a list of things I have tried:

- checked RCA wires and swapped them
- changed the ground spot and even changed ground wire
- swapped subwoofer out for another
- swapped amplifier and the new one turned on but again no sound
- swapped power wire and fuse
- checked settings on deck and subwoofer is on (avic-8100nex)
- plugged in an rca to aux wire in amp and sub worked
- swapped out headunit and still nothing

Anyone have an idea of what I may be doing? I am truly confused. I have installed amps and subs so many times and never had issues. Not sure why it doesn't work. Only thing i haven't swapped out is the head remote wire but it couldn't be that could it? Considering the amp turns on...

Any help would be great. Thanks!


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RonRizz

aside from something in your settings on your HU, this is a puzzler. you say you swapped the rcas, and the amp, and no good....... #1 check voltage at amplifier power in from battery. Terminal corrosion can cause a voltage drop... If voltage is too low, amp will not switch on, but may still light up. If voltage is ok, I would check is for voltage at your rcas at the amp while stereo is playing. this will verify signal is there. If there is none, move back to HU and check for voltage on rcas there. try swapping rcas to another ouput to see if it gets you any sound....
Its not a problem with remote lead if amp is turning on.
What other equipt. do you have in your system?

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TheMagZ

Thanks for the post. Its not corrosion because its a brand new car and brand new power wire. No other equipment other than what i mentioned. I'll check out what you mentioned and report back. Thanks!


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YzGyz

If the amp turn on then the only thing I would mess with is the signal input. I would pull the rca out and use a rca to 1/8" jack and play from another source Luke a cell phone. If it plays then it's a problem from the head unit or rca. I would swap the rca first and see if it plays.

Do try pluggin the rca in to the full range speaker slots. See if it will play. If still no then your Hu is jacked up and get a new one. If it plays then the Sub output slot may either need a certain setting on or that output jack in dead.

YzGyz

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TheMagZ

Thanks for the help but everything you have stated, i have tried. Played from rca out to aux from my phone and subs worked, swapped rca out and even swapped headunits.


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90 ST

Were the head units the same? Double check you are plugging into the right out put...I know it sounds stupid, but it happens, I had a shop call me for tech support the other day, wrong wire for remote turn on...they don't do a lot of audio install. lol

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TheMagZ

No, different decks and one only has one spot where you can put the RCAs. Remote turn on is working because the amp is turning on. Can't be that can it?


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RonRizz

this doesn't make sense to me. Obviously it is a signal input issue, if you input your phone and it played ok, that rules out voltage issues, as well as incorrect input settings at amplifier (possibly) and speaker out connections. the absolute only other thing it can be is that it is not getting a signal through the rcas. did you check the voltage to see if signal was present??
Next question.. was this hooked up and working, and just died, or a new install.
next question... Did you try a DIFFERENT set of rcas from HU to amp?
next question.. Is amplifier gain turned completely down
It sounds like you have done the majority of the troubleshooting necessary. Next step is to remove all pieces from car and do bench testing.

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YzGyz

Bench test like Ron said. If you did what I suggested, it's a signal to amp problem. The amp played with an outside source. Take things apart and hook it to a battery for power, use a cd b or phone and try that. Hook speakers directly to the Hu itself, then try Hu to amp. Your going to have to go and test one thing at a time to find the thing that I'd not working. Test the rca too... so strange..

YzGyz

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bigaudiofanat

What are the settings on your amp like? Where is the gain knob at? What is your crossover at? Is your rca's on the head unit plugged into the sub output?

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DeliriousClam

Yeah RCA's are the first thing that come to my mind.

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TheMagZ

This was a new install. Yea i tried two different sets of RCAs but still nothing...gain is set in the middle. I literally bought a new amp, amp kit and sub to try and still nothing...could it be a bad ground that causes this? Because i'm using the same ground.



Everything on the amp is how it comes from factory default. Yes, it's plugged into the sub output


Changed RCAs already



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YzGyz

Didn't you say the thing played from another source? That would mean that the sub work, the amp works. To Mr, it is clearly a HU setting, orCA problem. You can plug anything into the cra of the amp and brass the Hu if you really think it's the amp. This will also single out the Hu so you will know if the problem is between the Hu and amp or amp and speaker.

YzGyz

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YzGyz

Didn't you say the thing played from another source? That would mean that the sub work, the amp works. To Mr, it is clearly a HU setting, orCA problem. You can plug anything into the cra of the amp and brass the Hu if you really think it's the amp. This will also single out the Hu so you will know if the problem is between the Hu and amp or amp and speaker.

YzGyz

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RonRizz

this IS leaning more and more towards a head unit setting.
Still waiting to hear if you checked output voltage at the RCAs

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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals