subwoofer not working trouble shooting
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=116899
Printed Date: May 10, 2025 at 2:07 AM
Topic: subwoofer not working trouble shooting
Posted By: suprfast
Subject: subwoofer not working trouble shooting
Date Posted: October 11, 2009 at 11:08 PM
2009 Toyota Corolla
Equipment:
1 x generic high low converter(im testing this tomorrow, has the highest probability to be the culprit)
1 x Rockford Fosgate Amplifier installation kit(it was free)
1 x Alpine MRP-M1000
2 x Alpine Type R 2x2ohm 12"
Let me try to explain all trouble shooting i have done to minimize any time.
Tested speaker wires going into the amplifier to the speaker box at 1.8-1.9 ohms
Tested speaker wires from amp to speaker box with a 9volt battery and they did move in or out depending on polarity.
Amplifier does turn on and reads 13.9 volts from positive, 14.0 volts from head unit turn on(remote)
Music plays from all other speakers just not subs(consistently).
The subs for whatever reason only want to play music when i turn the bass knob on the factory radio to +5. Then they are cutting out.
I double checked all my connections behind the dash and wires are intact.
Now, how can i test the RCA cables by themselves to test for culprit?
Can i use an RCA to stereo headset adapter and plug my ipod into the RCA inputs on the amplifier?
Ive narrowed it down to the amplifier RCA inputs or the high low converter.
Car will be back tomorrow to check. Does anyone else have any information for me for further diagnosing?
Thanks
kris
Replies:
Posted By: Steven Kephart
Date Posted: October 12, 2009 at 1:16 AM
What wires did you use for signal? You may be using wires that are high-passed. Does your vehicle have a factory amplifier? It would be located under the passenger seat.
Posted By: suprfast
Date Posted: October 12, 2009 at 10:37 AM
No factory amplifier that i am aware of. I used the rear speaker wires coming off the back of the head unit. Ill have to find the colors, but im sure i found them from the 08 corolla on this site. It used to work, for about a month and now it just doesnt. Troubleshooting woes
kris
Posted By: lspker
Date Posted: October 13, 2009 at 9:58 PM
Had the same problem. Apperently there is a line level sub out on these decks.....2nd harness that you might be able to use. Check if auto sound level/speed volume is turned off. Yes plug in ipod to make sure anmp/sub work.
Posted By: suprfast
Date Posted: October 13, 2009 at 10:19 PM
ASL is turned off. Ill check out this 2nd harness tomorrow
kris
Posted By: boxhead78
Date Posted: October 16, 2009 at 12:59 PM
check for both power wiresand ground to the amp first,then you check your speaker wire to the sub ,but don't forget check the wires inside the box itself
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boxead78
Posted By: suprfast
Date Posted: October 16, 2009 at 1:21 PM
boxhead78 wrote:
check for both power wiresand ground to the amp first,then you check your speaker wire to the sub ,but don't forget check the wires inside the box itself
I have done everything you mentioned with how i did it in my first post.
Thank you,
kris
Posted By: soundnsecurity
Date Posted: October 16, 2009 at 2:46 PM
does your amp have a high level input? if so then use that. if not then check the connection for your converter before you asume it is broken. if you used T-taps to make your connection to the speaker wires then that could be your problem right there.
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