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I need to find out which wires from the head unit are for the the subs

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Rear Audio Output Jacks

Posted on Nov 12, 2009

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I can not get a 12vdc signal from the sub remote out wire blue with white stripe on a NESA 749nb, at one point I had power on the wire but when I got itr hooked up the power went away, I need a signal


if the head unit has any fuses go ahead and check those. Recheck all the wiring to make sure nothing was connected where it should't. If you still can't get any power out of the remote wire, there might be an internal issue with the head unit and if it's under warranty, take it back. The only other option is to use the red accessory power wire on the head unit and tap into that but the only thing is that when you turn off your radio, the amp will still stay on and will only turn off when your vehicle is turned off. I would prefer to have the head unit control the amp, so if it's warrantied take it back, but it's completely up to you.

Feb 26, 2012 | Car Audio & Video

1 Answer

How do I hook up a jbl 12 inch subwoffer to a car head unit


The head unit should have a RCA Sub Out. The RCA wire goes to the Sub Amplifier, along with power, ground, and a blue remote wire from the Head Unit. Next, the Sub Amp is wired to the Subwoofer with speaker wire. Without an amplifier your sub won't make any noticeable sound.

Oct 09, 2011 | 1998 Ford Taurus

1 Answer

I have 2 amps instalkled in my car one is sony 1200w 2 channel amp for speakers and one is solid audio f2500d for 3 subs my sound and every thing was good but suddenly from yesterday im having trouble when...


First disconnect the CD head unit from the sub amp and see if the other amp works. If yes, the problem is the wires to the amp, the amp itself, or the subs/sub wiring. If no, the problem is the head unit--probably an internal short.
If the other amp works with the sub amp disconnected, reconnect the sub amp to the head unit, but disconnect the sub wires from the amp. Try the CD player. If the amp goes to protect with no speaker wires attached, the amp is bad. If the amp is OK, the problem is the subs or sub wires. Hook the wires up to the amp again, but disconnect them from the speakers. Try the player again. If the amp goes to protect, the problem is the amp wiring. If not, the problem is the subs. Check the impedance of each sub using an ohmmeter to determine which amp is out of spec.
Please let me know if you have questions, and thanks for using Fixya.

Jun 11, 2011 | Solid Audio F2500D 1-Channel Amplifier Car...

2 Answers

Locked up sub-woofer cone won't move?


In theory your idea would work, however you risk damaging your amp by reversing polarity and the positive and negative wires from your head unit are low voltage so they wont provide enough current in reverse or normal polarity to free the cone of your sub. but here is something that you can try that is similar in concept.

Take a positive lead from your head unit and wire it to the negative of your sub. Now ground the positive terminal of your sub to the vehicles chassy using a wire. This creates a 12v-14v reversed polarity current that should be strong enough to (POP) the cone so to speak. hope this helps

Sep 26, 2009 | Jl Audio 12W7 Car Subwoofer

1 Answer

Connect alpine 7874 to alpine powered sub


You need to run the RCA cables from the head unit to the sub for the audio signal, and possibly a turn on wire (the blue one on the back of the head unit), unless the sub has an automatic power feature.

The sub also needs power and ground wires attached, but those do not connect to the head unit. Power should be run directly from the battery with an inline fuse, and ground should go to the nearest good ground point (Trunk latch, seat bolt, etc).

Mar 20, 2009 | Alpine CDM-7874 CD Player

1 Answer

Subwoofer.......


Please check your model number, I can not find it on the JVC service website.

This is a powered sub-woofer I think. You need to have a thick black cord that connects the sub to the head unit. Then the satellite speakers get connected to the speaker jacks on the sub-woofer box. The sub-woofer should also be plugged into an A/C outlet on the wall.

The speaker outputs are labeled right there where you connect the speaker wires. You should see a red and black connector for each speaker and they are labeled "front right" "front left" "center" "rear right" "rear left".

If you do not have the thick black cord you need to connect the head unit with the sub-woofer, you can not use this system.

If you look at the head unit and give me the model number on it, I may be able to find the part you need. But I must have a good model number to work with, preferably from the head unit.

Dave

Nov 10, 2008 | JVC SPPWA670 Subwoofer

1 Answer

Intstall sub and amp


ok not much info but
u need a red thick wire with a fuse from positive on battery to positive on amp
thick black ground wire from negative on amp to car body
remote wire from remote on amp to remote on back of head unit
rca leads from back of head unit to amp
then hook up sub

Jul 02, 2008 | Car Audio & Video

2 Answers

How do i turn on sub mode?


For one thing I hope you know you need an amp to even power subs at all.. The remote wire coming off the rca wiring that you hook your subs up with has to go on the prong 3-in on the top here is a rough diagram: the = signs are power and ground and the prongs are thicker the comma is you remote..
- - - - - - - , - =
- - - - - - - - - =

You need a wire coming out of that slot on the wiring harness.. it should be blue. and unless you have a power antenna(comes out when you turn your radio on) then you dont need the blue/blue&white power ant. wire you can just cut it and cap it. if your amp isn't coming on when you turn your ignition to acc then your remote wire isn't properly attached..

May 15, 2008 | Pioneer DEH-P4700MP CD Player

1 Answer

How do i install a subwoofer and amplifier to an exhisting car audio system


Hi,

The basic would be to wire the sub amp to your batteries with the trigger/remote wire powered by your car stereo/head unit. When your head unit is turned on it will in turn power up the sub amp. Of course the sub woofer need to be wired to the amp. For the signal/audio wiring, normally, the head unit has a stereo RCA female connectors at the rear intended to be connected to external amps through a pair of shielded/audio cable terminated both ends with RCA males. Some units have a special RCA specifically for subs. Most eternal amps also uses RCA for their inputs.

If the existing car audio system has already an external amp and your plan is to add on to this, the audio/signal from the head unit could be split to provide both for the existing and the new sub amp.

If the existing car audio does not have an external amp and their are no RCA connectors at the rear of the head unit, it is still possible to connect an external/add on amp by using an adapter that connects to the speaker wires of the head unit and converting it out to line level (through RCAs) appropriate for the input of the amp.

Hope this be of help/idea. Pls post back how things turned up or should you need additional information. it would also be nice if you can post brand/model of your head unit and intended sub amp.

Good luck and kind regards.

Jan 23, 2008 | Audio Players & Recorders

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