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Amp powers on but no output for speakers pma1200

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Audio amplifier IC´s damaged you need to replace them.

Posted on Sep 18, 2008

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How do i hook up my Aiwa 90 watt self powered subwoofer to this Onkya A-8037 stereo amp there are only two auxiliary ports in the back and both are used by the stereo.


Your powered subwoofer should have two different pairs of inputs - one is a line input that is connected to a subwoofer output on your amp. The other inputs are those that are directly connected to the existing speaker outputs on your amp.

When you have all working make sure that the sub output is in phase with your other speakers lest you have bass cancellation.

Jun 20, 2015 | Car Speakers & Subwoofers

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Which amplifier is best suitable for me to use?


This really depends on the setup you intend to create in your vehicle.

The Amplifer (amp) needs to be matched to the speakers you intend to run.


As a rule of thumb, the power of the amp shouldn't exceed the max. power of the speaker (this may damage your speaker). Instead, the amp's RMS output power should be at 75-100% of the speaker's RATED (RMS) input power. NOTE: this must NOT be confused with max power.

Ideally, you want to run each speaker with its own amp channel.

A subwoofer will usually require a hi-power single channel amp, or a 2 channel amp, bridged into 1 (to increase power output required for the sub).

Here are some examples in simpler terms:

1 channel (hi power) amp can run a subwoofer.
2 channel amp can run 2 speakers, or 1 sub (bridged).
4 channel amp can run 4 speakers, or a combination of 2 spkrs + 1 sub (bridged), or perhaps 2 subs (bridged).

Hope this makes sense.

Feb 27, 2013 | Car Speakers & Subwoofers

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Kenwood kac-749s amp power indicator flashing red. what does this mean and what can fix it?


Either there is a short in the in the amp or hopefully just the speakers or wires going to the amp. disconnect any speaker input output and turn your amp back on(you will only have power, ground, and remote wires plugged in at this time) and if the red protect light goes away, then there is a problem with the input/output speaker wires, this includes your RCA's. If it's still flashing red then there may be a stray wire shorting to the amp in the speaker outs, other than that your amp may be fried. By the way, if it works without any speakers connected, including RCA's try connecting one component speaker at a time starting with your RCA's(if using them), speaker in, then speaker outs. If it turns into protect mode, note which speaker/RCA it was and replace or repair the short.

Jul 11, 2011 | Kenwood Car Speakers & Subwoofers

1 Answer

How do i install my component


from the speaker outputs of the head unit / amplifier. Connect from the positive and the negative outputs to the respective positive and negative input of your X-over box. Now connect from the X-over woofer/midbass output to the bass driver. Now do the same for the tweeter from the X-over from the tweeter output to the tweeter. Make sure that all the positives and negatives are correctly connected.
If you are going to use your head unit to power the speakers then you should know that:
White & white with black stripe is the Front Left Speaker output
Grey & Grey with black stripe is the Fron Right Speaker output.
Green is rear left
Purple is rear right.
I think you get that the black stripe speaker cables are the negatives.
good luck

dreamsystems.

Feb 11, 2011 | MB Quart - 5.25" 2-Way Component Speakers...

1 Answer

HAVE A 1991 NISSIAN MAXIMA 3 SPEAKERS ARE NOT WORKING.IT IS NOT THE SPEAKER THEM SELVES I HOOKED UP A RADIO TO THE SPEAKERS AND THEY WORKED WHAT DO YOU THINK


I would check that amp is not faulty, as in check power to it etc, and all connections clean etc. If not too intimidating, may be a good place to by-pass amp and see if speakers work that way, as well as hook new ones (or known good ones) to output of amp to see if same result. Are you able to identify input wires from stereo, and output from amp?

Jan 27, 2010 | Car Speakers & Subwoofers

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Hi, I'm trying to install a sub and amp in my 2006 ram w/OE head unit. What wires do I have to tap into to get speaker output? Thanks, Chris


You'll need power from the battery to your amp (you may be able to find a spare one at the head unit), and, using suitably thick wire, connect those to the 12vDC input of the amp.

If the amplifier accepts speaker level inputs, you can connect the amplifier input to the head unit output (maybe use the rear speaker output). At the other end of the amp, connect your subwoofer. If there's only one, use the amp bridged (more power). If you're using two, and your amp has 2 channels, use one channel per subwoofer. When you power all this up, turn the volume up from 0 slowly - if anything sounds wrong, turn it back down and switch it all off. Check all your wires and start again.

Jan 14, 2010 | Kenwood Car Speakers & Subwoofers

2 Answers

Subs quit working its not the amp they were working fine


How do you know it's not the amp?  Have you tried hooking up good speakers to the same output terminals of the amp?

Speaker failure modes: Usually they fry, the foam surround disintegrates, or there's a bad internal wire connection/solder joint that fails. Subwoofers are designed to handle a lot of power and rarely fail.

There are three possibilities: 
1) The signal isn't getting to the amp from the crossover.
2) The amp is toast.
3) The speakers are bad. 

You don't tell me whether you have a separate amp for the subs with an external crossover, or whether you have one amp with internal crossover and separate internal amps and speakers outputs for subs and standard speakers, so I can't be more specific.

What you can do is:

Check all external connections, including the power connections.

Try substituting replacements for the patch (signal) cables to see if you have a bad cable.

Beyond this, it's pretty much up to a repair technician.

Nov 15, 2009 | Jensen XS-10W Car Speaker

1 Answer

I get a pop from the sub when the power comes on.


This is caused because the stereo you have put in, is a high power output, or higher than the factory and puts that extra power into the factory amp systems causing the amp to surge the power to the speaker resulting in the pop sound,most newer cars use a stereo system without an internal amp so as to reduce heat and a external amp in usually under a seat or dash and a high power stereo boost the output of the amp.

Sep 27, 2009 | Car Speakers & Subwoofers

2 Answers

Speaker Problems


If you are unplugging the subs from the aux output at the cd player, your Audio lines feeding the amps is shorted somewhere between the cd player and Amps.

Nov 13, 2007 | Car Speakers & Subwoofers

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