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Have a dc audio amp power light comes on .but no sound comes out through rca . its a 175.4amp how do i fix it

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No sound comes out of the RCA's.

Posted on Nov 15, 2013

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Posted on Jan 02, 2017

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SOURCE: Visonik V117SX Car Audio Amplifier

The RCA cables are for leads from your deck to your amp. Assuming you have an aftermarket deck, pull it out of the dash and look at the back. There should be a red out put and a white output for your cables to plug into. They're sometimes labeled left and right to help you make sure you hook up the amp right. If not, just be sure to match them up between the deck and the amp. If you have the stock deck in there, it's unlikely that you'll have RCA outputs, as most stock decks I've seen do not. As for the protection light being on, your amp is most likely shorting to ground somewhere. Be sure you don't have it screwed right to any metal parts of the car, as this can cause problems. Most amps have a section in the manual warning against this and the problems it can cause. Some amp manufacturers don't say anything about that or say that it will be safe, but, as a rule, I always just play it safe and mount it either to my sub box or on a piece of plywood or something that is secured in the car. Also, make sure that the in-line fuse on your power lead isn't blown, and most amps have one or more fuses on the side of them, so check those, too. If none of these things are wrong, then it might be an internal problem and I can't really help you with technical stuff. Hope this helps. Please leave feedback, too.

Posted on Oct 10, 2007

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SOURCE: JL Audio 500/1 amp

I need the answers to the questions I posted to know the condition of the amplifier.

Posted on Jun 09, 2008

  • 71 Answers

SOURCE: my amp has no sound coming out of an rca jack

It might just be an easy fix at your local electronics repair shop. May be cheaper than buying a new amp. Was for me.

Posted on Mar 15, 2010

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1 Answer

Who needs a «remote DC terminal» ???


Hello labdes,

The "remote" terminal of the amp requires a +12V signal to rurn the amp on. Normally, this is supplied by a specific wire from the vehicle "head unit". But you can simply jumper it to the positive 12V source. + should go to the 12V positive and to "remote", - to the 12V negative. I'd wire a switch across the "remote" and "power" terminals to have a way to turn the amp on and off.

I'm hoping that your "car amp" has speaker level inputs, because the PC card is probably not going to have preamp outputs. If the amp has only RCA type inputs, you will need to purchase a LOC (line output converter) such as the PAC SNI-35 shown here. They are also usually available at your local car audio shop and some big box stores.

Hope this helps.

Jun 13, 2009 | Lanzar MXA 412 Car Audio Amplifier

1 Answer

Jl audio 250/1 amp


This could be due to multiple things. First I would run a test light to the speaker leads of the amp as if you were running your speaker...it should light up and blink to the sound of music coming through. If no sound then most likely your RCA cables are bad or input jackets on the amp are loose and be shorting out causing the low light to come on. If you know 100 percent that you bought that amp in good running condition then most likely its something simple like the RCA wires are bad..Hope this kind of helps you out.

Feb 21, 2009 | Jl Audio 250/1 Car Audio Amplifier

2 Answers

6 channel power 1000watts earthquake amps red is on


This is normally a grounding problem in the amplifer. If you have a volt meter, check the voltage at the ground of the RCA input on the amplifier. If that voltage is anything more than just a few millivolts then you have a problem in the pre-amp of the amplifier. You should also only connect or disconnect the RCA jacks while the system is off. Otherwise you can get a loud popping noise that can damage the amp or the speakers. Check that voltage on the amplifer RCA jacks with the head unit not connected to the amp with the RCA cables, then if that is OK, check the RCA cables coming from the head unit. You may even have a voltage on those RCA's coming from the head unit, in which case, you have a problem in the head unit. You will be looking for a DC voltage, if you have anything more than just a few millivolts (0.070 +/- DC volts) on either of those then you have found the cause. After that, it will require a technician to be able to troubleshoot the amp or the head unit to determain why you have that DC voltage where it should not be.

Let me know if I can be any more help,

Dave

Jan 22, 2009 | Car Audio & Video

2 Answers

Jl audio amp 1000/1 fix


IVE HAD 2 JL 1000/1S DO THIS TO ME EACH TIME ITS TURNED OUT TO BE A SHORT IN THE RCA IMPUT BUT ALSO CHECK YOUR RCA CABLES AND THE SUB INPUT ON YOUR HEADUNIT

Dec 22, 2008 | Jl Audio 1000/1 Car Audio Amplifier

2 Answers

Protect Mode with RCA's


It sounds like you have some DC voltage on the RCA input.

You need to figure out if the problem is coming from the head unit or if it is in the amplifier.

If you have a voltage meter, you can use it to find out very quickly.

Set the meter for DC and for a max level of more than 12 volts. Most meters I use have a 30 volt level. That would be a good setting.

Take the black lead and make sure it is grounded to the chassis of the car or to the ground of the power terminal, be careful and make sure it does not touch anything else.

With the RCA cable disconnected put the red lead on the inner part of the RCA cable and see if there is any DC voltage and then check the ground or outer part of the cable. Do the same for the other channel as well.

It should be very close to zero volts. A couple of millivolts is fine to. Any voltage here will cause the amplifier to go into protect mode, which is what is happening to you. You will then need to have the head unit serviced.

If you have a Pioneer head unit, I have seen many of them with an open ground fuse for the RCA jack. That fuse is a surface mounted fuse and is very small and hard to locate on the main board of the radio. If you do have a Pioneer head unit the voltage may seem OK, but you will have an open ground, but that normally does not put the amp into protect. It makes the audio sound very weak and you would have a loud hum. I can help you with that if it turns out to be the problem.

If the voltage on both the RCA leads is OK, then you need to check the amplifier.

You can put the meter lead on the ground of the RCA jack on the amplifier, if you have anything abnormal there, you have a problem in the amplifier. Be careful checking this because you can easily touch the lead to the chassis of the amplifier at the same time as the RCA ground. Most of the time, if yu have a problem in the amplifier like the one you are having, this check of the RCA ground will result in some DC voltage on it. If it still checks OK, then put the lead into the RCA ground and check the positive part of it. You may need to move the lead around a little to get it to touch the metal inside, it is on the bottom part of the hole inside the jack.

I think you will find that you have some voltage on the RCA inputs of the amplifier. To fix this properly you will need to take it in to be serviced.

Sometimes you can ground the RCA jack ground somehow with a jumper wire and then turn the system on with the RCA cable plugged in and it will seem normal. But you do not want to do that as a repair, only to see if the amp will play. If it does play, you know that the problem is in the pre-amp of the amplifier. That would be the only reason to connect an external ground to the RCA jack. You still have a problem in the amplifier. If it does not play normal, you still have a problem in the amplifier if there was some DC on the RCA jack.

Sorry this answer is so long, but the problem you are having will require service of one of your units, you just need to know which one it is. If your inputs get grounded, you will not have the amp go into protect, you just won't hear anything.

Let me know if you need more help and if this was helpful to you a good rating is always appreciated.

Jun 22, 2008 | Power Acoustik TS1440-2 Car Audio...

1 Answer

Odd behavior of power and protect


With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connectes to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

Do this with no RCA or speaker wires connected. Let me know what you find.

Apr 26, 2008 | Power Acoustik TS1440-2 Car Audio...

1 Answer

Protection Light Is Coming On


You say the protection mode only occurs when you plug the RCA's in. Does it have to be both RCAs or just one?

The other end of the RCA cable is plugged into the HU?

It possible the RCAs have too much DC voltage on them, causing the amp to go into protection.

Is there a short in the RCA cable?

I would definitely check out the RCA connection at the back of the HU, as it sounds like there could be other issues there. Make sure the RCA connectors aren't touching any other metal (especially +12V).

Mar 14, 2008 | Car Audio & Video

1 Answer

Multipal amps


make sure your speakers are connected correctly if subs and are inside the box then check connections also at times the rca at the back of the head unit can disconnect. if power light is on then error is either speakers not connected correctly, rca faulty or not connected or speaker output on amp is blown

Jan 03, 2008 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

Rockford Fosgate P3002 Amp


what are the color of the lights that stay on.red= protect/ green=on.if the amp has little sound it probably still working,check deck output volume(rca)

Aug 22, 2007 | Sony Xplod XM-554ZR Car Audio Amplifier

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