Question about Legacy Audio Legacy - Red Series: 2 Channel 500W Red Series Legacy LA-370 Car Audio Amplifier

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Half my amp works

Only one side works and both fuses are good i switched speakers and rca jacks around and still only one side works the right side does nothing can you help me thanks

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Im sorry to tell you, that if only one side is working, you most likly have an open driver transistor or input device. If the one side had a shorted output then the whole unit would go into shutdown. The fact that the unit still works is a good sign. The correct way to test an amp is with some equipment most folks do not have, and that means a trip to your local good audio repair facility. They will need to doi a bench check on the amp with load resistors and a tone generator. If the amp preforms good on the bench, then you should start looking for bad speakers and or pinched wiring,loose connections or bad speakers. Let us know what happens? Good Luck

Posted on Oct 05, 2006

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Posted on Jan 02, 2017

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Power but no sound help plz....


well here we go how do you have your pioneer radio connected .
did you run the radio speaker wire out to the factory speaker or did you have an amp connected to the rca output jacks.

1 well if the radio connect by the speaker wire out the
output chip in the radio is fried and needs repair ....

2. if u have a amp connected to power your speakers for sound
check the amp to make sure you have power and no lose connection or speaker wires disconnected.
3. it also possible that the rca jacks are fried too


I no by experience that pioneer loses ground on the audio output jack (rca) well what we did to fix it is..
take and 18 gauge wire stripe back about 1/2" to 1" of the insulation to expose the copper wire and wrap this around the metal casing of the rca jacks and then ground the wire to a ground point do this for both left and right rca jacks...

radiorepair@windowtintingin239.com

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1 Answer

LED lights up but! ???


Sounds like there is a problem with the amp. Try switching the inputs around for that output on the amp. If that does not help, Yes I would have to say that there is a problem with the amp output circuit.

Nov 06, 2007 | Infinity BASSLINK Car Subwoofer

1 Answer

How do you hook up a amp with a factory radio.. a 2002 impala


1- you need to provide a fused power wire from battery to amp
2- provide a ground wire from amp to car body or frame (be sure to clean off paint if connected to body)
3- connect your remote wire to your fuse box (16 to 22 gauge wire will be fine)
4- connect a line output converter which will allow you to use rca jacks (one side connects to the speaker wire in your car and the other to your rca jacks)
5- finish by connecting your speaker wires and rca jacks
if helpful please rate 4 thumbs up.

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I have my vsx-1018ah receiver hooked up in for 7.1. Everything was fine for months. Now the back right speaker won't work. Speaker is fine, connection is good. Tried hooking up a different speaker and...


Assuming you're using the Surround Back speakers for their primary purpose, let's establish that there is something in the way of programming being routed to that speaker. Fire up the speaker level setup procedure and use any handy audio device (*) to see if a signal is present at the Surround Back Pre Out jack. If not, that speaker will never, uh, speak.

* For this test you could use your powered subwoofer. You DO have one, right? Just swap the RCA cable from Sub W Pre Out to the SB R Pre Out jack to see if anything appears there.

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1 Answer

Pyramid arctic 4ch amp pb1617x goes right to protect mode when turned on wires are good fuses are good to. how do i fix it


pull out 1 rca jack at a time and try it..usually speaker wires touching...or blown speaker

Nov 08, 2009 | Pyramid PB1617X Car Amp

1 Answer

Hello. I have an Ultra Linear Amp - UL724 model. I am wiring it up to play in 2 channel mode - in stereo. I can only get one channel to work - the left... I swap the rca cords, still only the left side...


YOUR METHOD OF TROUBLESHOOTING USING THE PROCESS OF ELIMINATION IS RIGHT ON AND PERFECT. IT INDICATES A BAD AMPLIFIER CHANNEL. I KNOW THIS SOUNDS ODD, AS YOU HAVE TWO OF THESE NOW. IT IS RARE, BUT I HAVE SEEN INPUT CONFIGURATION SWITCHES WIRED BACKWARDS, SO THE ONLY THING LEFT TO DO IS TO HOOK UP THE BAD CHANNEL TO ONE SPEAKER ONLY, BY ITSELF. THEN TAKE ONE RCA ONLY AND PLUG IT INTO ONE RCA INPUT AT A TIME. THEN MOVE THE INPUT SWITCHES AND REPEAT THIS PROCEDURE UNTIL YOU HAVE TRIED ALL SWITCH COMBINATIONS AND ALL INPUT JACKS. WHAT YOU ARE TRYING TO DO AT THIS POINT IS TO DETERMINE IF THERE IS ANY RCA JACK WITH ANY SWITCH POSITION, THAT WILL ALLOW YOU TO GET OUTPUT FROM THAT CHANNEL. IF AFTER THIS TEST, YOU STILL HAVE NO OUTPUT, THEN NO MATTER HOW ODD, IT WOULD INDICATE THAT YOU DO IN FACT HAVE A SECOND DEFECTIVE AMPLIFIER. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

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1 Answer

One channal does not work


swap your RCA's input to the amp. Does the channel that works switch to the other side? If so, then the problem is either your rca wire, or in your source unit. (try the wire first). If the same channel still is out, then problem in the amplifier or speakers. Move to swaping the speaker wires, right to left, and left to right... If problem same, then trouble is AMP, if problem moved, then trouble is speaker. If amp, remove amp, troubleshoot amp... (there are 3 basic parts to any amp... Power supply, input section, and amplifier section...) You know it's not the power supply because the sound is good on at least one channel, and most alll amps use one power supply for all channels, so if one channel sounds good, then you can rule out the power supply. Second, when an amplifier fails (usually, 90% of the time or more) it will result in a shorted output transistor or some other nasty condition that will blow a fuse, or toast a supply almost instantly, and again, your amp powers up, so odds are that the amplifier section of the amp might be ok. (no guarantee here, it's just the odds...I'd say it's like a 40/60 thing.... This leaves you to focus on the input section. First rule out the simple things... bad wiring, (rca, or speaker), bad speaker, bad source. Then rule out the simple things at the amp... broken rca input connectors (inside the amp at the PCB where the solder is) or outside the amp, where the jacks may have been crushed. Then rule out broken speaker terminals, where they can be cracked inside at the board where the solder is in the same way. After all this, you need your amp serviced by a qualified tech.

Jun 08, 2009 | Car Audio & Video

1 Answer

Ok this problem is killing me...


maybe the speaker is bad

First try one thing, switch the rca jacks around and see if the other speaker stops working this time.

If so the problem is in the rca jack or head unit.

If the same speaker is still not working, the problem will be the speaker, you will have no other options left since you changed amplifiers and checked all wiring.

Let me know if this helps you

Jun 18, 2008 | Visonik Dual Bass Box with Amplifier Car...

1 Answer

Right side speakers don't work


if you are using RCAs as inputs to your amp.Swap the R to L @ RCAs to see if its comming in okay from radio.If both RCAs have audio then amp is bad ,If amp has any type of switches , move swithces to see if it comes back .Also if both RCAs inputs have audio .Move the RCAs when connected on amp to see if amp has bad connection in board to RCA jacks..If audio comes back on bad side when jack is moves .Then you have bad solder joints on board..If not then you must have bad outputs on amp..

Dec 22, 2007 | Car Audio & Video

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