Question about Rockford Fosgate Power 1500BD Car Audio Amplifier

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Subs lock in place. Only direct current comes out of the speaker output

Amp is NOT in protect, and turns on without over heating. No fuses were blown. I put it in a 65 mustang ran for 1 hour. Turned off the car, turned it back on and heard a thud. Any help??

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The amp has failed and will need to be repaired.

Let me know if you have any other questions.

Posted on Jul 18, 2008

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My zx850.4 keeps jumping to protect i have cvr10" 2 ohm wired as vc series/ to pallel subs and it keeps jumping to protect its 2 ohm stable i can hook subs to my 300.4 that alreadyruns 4 speakers and it...


Be aware your amp can deliver more power to a 2 Ohm speaker, but will not work if the 2 Ohm speaker somewhere in the audio spectrum comes beneath the 2 Ohm. Because you want the sub, to go as low as possible, it could be the speaker will have a very low impedance under 20 Hz, causing your amp to go in protection.
The power you give to the amp, will not be the cause it going in protection. It is sensing the output current, so it will stay in the borders the end stage can deliver. Try two speakers in series and give the same power. If the amp is not driven into the protection, I think you are closing in to what is causing the problem.

Jul 06, 2014 | Car Audio & Video

1 Answer

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

1 Answer

Klipsch THX subwoofer just stopped working. Speakers still work (sound awful without the sub). Fuse looks solid. Back of sub was hot.


Heat is the clue.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If you can gain access to the subwoofer driver, disconnect one side of it and see if the amp comes up. The driver miight have shorted.


If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Mar 13, 2011 | Audio Players & Recorders

1 Answer

What kind of car amp would power these? I had these installed way back in 05 and the place is no longer there but the amp they used keeps over heating


any amp over 400 watts can power pretty much any sub even one without a sub output just bridge the connection to an amp without sub output. btw a subwoofer does not use as much watts as it says on the sub it usually only take a couple hundred watts to power the sub and make it sound clean

Jun 02, 2010 | Lightning Audio LA1.12.4 Car Subwoofer

1 Answer

Protection light comes on went the amp is turn on and it stays on for four seconds and then the amp turn on


Disconnect any speaker from the amp then re-power. If it still goes into protection, your amp needs serviced. Shorted output transistors most likely. And check your Sub for shorts as well. If the voicecoil on the sub is burnt, it will short any amp. If you can use a meter, check the resistance on the sub. Hope this helps

Jun 02, 2009 | Kicker KX Series 04KX1200.1 1200w RMS...

1 Answer

Subwoofers won't work and they are brand new


Hello,

I've got a pair of these MTX's subs powered from a Fusion 450 watt 2-channel amp. For the price, they are great. By the way, they are 4-ohm.

My first suspicion would be that something in the first incorrect wiring damaged either the amp or the subs. Can you explain specifically what the "installing the subs incorrectly" means? Was the amp output shorted out at any time or was it operated without a load? Either of these conditions will fry an amp and sometimes, the protection circuitry doesn't work either.

First make sure that your amp is still working. Check both the primary power fuse, usually located near the vehicle battery, and the fuses on both sides of the amp. Make sure that when you turn the system on, the power light comes on steady (blinking is protection mode). Test your subs one at a time on a speaker output.

Mar 29, 2009 | MTX Thunder 4500 T4510-04 Car Subwoofer

1 Answer

No sound coming from speakers Blaupunkt GTA470 Amp


Amp Failure:
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause. If the fuse protecting the amp is too large, if the protection circuit doesn't respond quickly enough or if the power supply is poorly designed, the power supply transistors may fail. If you see a lot of black soot on the power supply transistors (near the power transformer), the power supply transistors have failed. Soot on the board doesn't necessarily mean the transistors have failed. Sometimes, technicians don't clean up the mess from a previous failure. Transistor Failure/Checking Transistors:
In general, when a transistor fails, it will either short (common for output AND power supply transistors) or open (common for power supply transistors). Transistors act like valves. They control the current flowing through a circuit. A shorted transistor acts like a valve that's stuck open (passing too much current). In the case of an output transistor, the shorted transistors tries to deliver the full rail voltage to the speaker output terminal. If you've ever seen a damaged amp that pushed or pulled the speaker cone to its limits when the amp powered up (common on some Rockford amplifiers), that was almost certainly due to a shorted output transistor. When checking transistors, you most commonly look for shorted connections inside the transistor. You do this by using a multimeter to look for low resistance connections between the transistor's terminals.

Dec 31, 2008 | Blaupunkt PCA460 Car Audio Amplifier

1 Answer

Amp powers on, no sound from subs


the output is blown. It is in need of service.
There are many different ways that an amp can fail but the two most common failures are shorted output transistors and blown power supply transistors (< those are not blown). There are several types of protection circuits in amplifiers. The most common are over-current and thermal. The over-current protection is supposed to protect the output transistors. Sometimes it doesn't work well enough to prevent the failure of the output transistors but it will work well enough to shut the supply down before the power supply FETs are destroyed. If the amp remains in protect mode, goes into protect mode or blows the fuse as soon as the remote voltage is applied, shorted output transistors are almost certainly the cause.

Dec 28, 2008 | Alpine MRD-M1005 Car Audio Amplifier

1 Answer

No power


Disconnect the sub or speakers and turn on the amp, see what happens. If the amp turn on without the protection light, then your sub is blown. Also check to make sure ALL your fuses are good including the one under the hood. If you have a meter, test the fuse for continuity. The problem can also be a bad ground.

Aug 19, 2007 | Kicker KX150.2 Car Audio Amplifier

2 Answers

Overhaul light (red) stays on!


This is not a ovehaul light. It is called the protect indicator. It kicks in when the amp detects a fault on it's output. Disconnect the speaker / sub. Power up the amp and see if the light goes out. If it does you Sub is toast and needs to be replaced. If it stays on then the amp is done.

Jun 22, 2007 | Lightning Audio LA1.300.2 Car Audio...

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