Question about Pyramid PB536GX Car Audio Amplifier

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Internal output I've been having problems with blown fuses on the amp. It is bridged from another amp and connected to a 600w sub. The amp is lighting up but the power and protection lights will not come on. Plus when installing a fuse, it blows on contact. I have been told that it could be the "internal output" of the amp. Is there any way that I can repair this myself?

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Unless you have experiance with repairing circutry you will probably do more harm than good. The board is sensitive to heat and could easily be damaged further.

Posted on Mar 29, 2007


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I have a kenwood excelon xr-4s amplifier and in channel 1 and 2 i have front speakers, in 3 and 4 i have a infinity kappa doble coil 4ohm each coil. When i turn it on loud it shut down the amp and start on...

Since you have two dual 4 ohm voice coil subs, hopefully you had one sub wired in parallel to each channel separately (one sub on 3, one sub on 4). That way, each channel gets 2 ohms. If you have both subs bridged across channels 3 and 4 (left + and right -) then you have applied a 1 ohm load to your amp, which would cause the problem you're having. It's possible the amp has been damaged, but the fuses on the amp should have blown to protect the amp. Check your sub wiring to make sure you don't have a 1 ohm load bridged across channels 3 and 4. Also check the fuses on the amp itself to make sure neither of them have blown. If everything is fine there, check your fuse under the hood that's connected to your battery. That fuse could have also blown.

Nov 14, 2017 | Car Audio & Video

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How to fix blown sub (replace fuses etc)...? stop protective light illuminitating?

The first thing to try is to disconnect the sub and all speakers from the amp's output block. The only things that you need connected to the amp are the 12V power, the ground wire, and the remote wire to turn it on. If the protection light comes on with only these three wires connected - your amp has been damaged internally and will either need to be repaired or replaced.

Jul 27, 2013 | Car Audio & Video

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My buddy had a sony x plod 600w amp in his car pushing two 12's. he sain it never gave him one problem. he sold it to me and after i turn my truck on it has power. it even works fine until i turn it up to...

Make sure the ground is securely fixed, power cable too. Also check the ohms of each speaker and the output of the amp. If you have two 4 ohm subs (2ohm load) running of the bridge of that amp, it aint gunna work. Im sure that amp can only run 4ohm. Try not bridging it.

Feb 02, 2011 | Car Audio & Video

2 Answers

Amp quit producing output, power indicator is on

it can't be a fuse cause if it was then there would be no power you might have blown the speaker terminals. did you check to see if the sub was blown.

Jul 28, 2010 | Rockford Fosgate Car Audio & Video

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Have 600w amp 2 10's and they aint even bumpin, DO I NEED TO BRIDGE IT

No, that'll use two channels to power one sub. First, is the gain turned up? There's a knob on the amp to turn it up. If the gain is already up, and if the amp is two-ohm stable, then wire the subs in parallel. I'm assuming the subs are each hooked up to their own individual channel. Swap the two negative wires at the amp, so sub 1 is hooked up to channel 1 positive and channel 2 negative, and vice versa for the other sub. That'll dramatically increase the output. Again, make sure the amp documentation says it is 2-ohm stable, or you'll damage your system.

Dec 24, 2009 | Kenwood KAC-729S Car Audio Amplifier

1 Answer

Bridging outputs on JBL BP300

Hello paulnkate,

The BP300.1 is a mono (1 channel) amp. You cannot bridge a mono amp. Bridging is a method of combining the outputs of 2 or more channels of a multichannel amp into a single mono load. On your amp you would connect a single sub to one of the +'s and one of the -'s (either one is OK, they are connected internally). The other pair of terminals is just for convenience, making it easier to connect, if you want to power 2 subs.

Hope this helps.

Jul 20, 2009 | JBL BP300.1 PowerValve Series Car Audio...

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Subwoofer buldging out problem

When speakers are wired in the wrong way the will do the "pushing out" you're describing. Basically the polarities have been reversed and if kept like this over a period of time will blow the speaker. Best thing to do is to disconnect the power by the negative on the amp and take out the fuse from the power supply. Check the wires running from the amp to the subs, negative to negative and positive to positive. I know it sounds basic but many people do mix it up! I would also check to see what channels the subs have been wired into?

Best way is to have one sub from channel 1 and the other sub from channel 2 for example. Or if its a bridged 4 channel amp, have 1 sub running from channel 1&2, and the second sub running from channel 3&4 still making sure of the polarities. Again this all depending what kind of amp and sub you have.

For example;
A 4 channel (bridged) 1000W amp. 250W max per channel or 500W per 2 channels! So if you have 2 500W subs, by connecting one to a single channel will decrease subs ability due to the lack of power supplied. However by combining 2 channels you optimize the output!

Once you know all your wiring from your amp to subs are ok/good connections/good wires etc you shouldnt have to "wiggle the wires" to get it to work as this is just a bad connection. Also ensure that no 2 wires are touching. Make sure that the master volume on the amp is turned down. You dont need this to be on loud at all, in fact far from it or you'll risk damaging both the amp and subs!

Hope this helps!

May 27, 2009 | Car Audio & Video

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Hi Trim God,


I do not reccommend that you push the Pioneer speakers over 100 watts.  The jenson will already drown the car with bass through your pioneers so much you will want to turn off the bass boost when playing some low bass hip hop songs. It changes from one venue of song to another, so I just keep the jenson bass boost off and use my head unit to adjsut the sound to fit my listening prefences. I am telling you man, you will be blown away .  Hook up the pioneers straight to the Channels,. do not bridge.  I put Subs in my truck though.  I used the Pass output to send the audio to me Jenson 2 Channel 600W amp. I drive one 10 inch enclosed JBL Class A/B Sub. I bridged the output of the 600 W amp to the 10 inch sub  in my Z28.  The pioneers never get drowned out.  I did smoke my 2 channel Amp one time. and also took out a MTD 10inch sub. I am talk shooting flames and smoked the whole car up. I think if you bride the XA4150 to the pioneers, you will have the flaming smoke problem in no time.  

Oct 02, 2007 | Jensen XA4150 Car Audio Amplifier

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Amp Problems

You are probably presenting too low an impedance load to the amplifier. In bridged mode the amp must be connected to a minimum 4-ohm load. If your subwoofer is a dual voice coil type with 4-ohm voice coils, you cannot wire the voice coils in parallel and connect it to the bridged amplifier. If you have a sub with dual 2-ohm voice coils, you can wire the voice coils in series and connect it to the amplifier in bridged mode. To connect voice coils in series: Connect a wire from the negative terminal of one coil to the positive terminal on the other coil. Connect the unused positive and negative terminals to the amplifier's output.

Mar 14, 2007 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

P3001 amp may be fried

Check this out:

Aug 06, 2006 | Rockford Fosgate P3001 Car Audio Amplifier

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