Hi,

I've posted this thread on talkaudio aswell so have copied it across to try get the quickest and most responses.

I was driving home at around 60 the other day and everything was fine but when I extended my right foot a little to stretch, everything got quieter. This felt really odd so when I got home I opened up my boot and saw my amp had gone into protection. I disconnected it all and left it for a few hours and then went back and still it is in protection. I don't know what's happened to it because I've had it setup the same for months now and have had no problems. Also my front end has got quieter so I don't know if anything is wrong with my HU aswell as my front speakers are just being run off the internal amp for now.

Any help is appreciated greatly.

Thanks

Alex

Sounds like a short circuit on the output stage somewhere, could be caused by a blown or faulty speaker. Hopefully not a failed coil inside the amp otherwise you will need a new one.

You need to remove the fuse to reset the amp!!!

make sure when you extened your right foot you did not pull any wires! running from the back of the HU

Joel

Thanks guys I'll have a look and see if any of your ideas rectify the problem I never thought of any of them.

As far as it being a blown speaker the amp is running my sub and I've pushed the cone to test the coils and it seems fine. I'm hoping its something simple and has nothing to do with the sub as that's the most expensive piece of my system.

Thanks and if anyone else has any suggestions keep them coming.

Alex

Just been out to the car and I've checked the cables and they have plenty of slack and haven't been damaged, I then disconnected all the fuses and cables and reconnected everything again and still it stays in protection mode. I disconnected the sub and RCA's and the same happens, does this mean I can rule out the sub causing this.

It's really doing my head in now, is the amp completely knackered?

Cheers

well, maybe the sub went faulty and damaged the amp but very unlikely i'd say.

does sound like bad news on the amp front though :(

how old is it?

It's a couple of years old but has only been in use for about a year in my last 2 cars. I'll have to wait till I get back to Uni and try one of my other amps and see if that works then I'll definately know the problem. If it is my amp that's

If your sub goes faulty on its own, it will have no effect on the amplifier. If you overdrive a loudspeaker with a much more powerful amp that it can handle, again you will have no problem with your amp, you'll only blow the voicecoil out of the spider. Sounds like you have some circuitry problems within the amp, probably need a check up on resistors. Overtime it does need servicing, it's electronic.

An amplifier goes into protect mode primarily to prevent you burning out the internal circuitry with an overdriven signal, and also to protect the speakers you are driving it with (mainly if the speakers and amp are matching power).

If you take it to the dealer who sold it to you, I'm 100% sure it will be repaired and restored as new. Remember, it's electronic. These things can always be fixed.

maybe the heat has finaly got to it, the day you posted this the temp was quite high..

however id recommend trying like you said another amp in your car or that amp in someone else's car...

do you still have the manual??

sometimes amps can indicate what protection mode they are in eg thermal, short etc

they do this by protction light being on in solid state or flashing etc etc

Joel

Try disconnecting the sub and power up the system. If the amp stays in protection mode then the output stage has blown (most likely). If it works normally, then the sub has blown.

arcom I think its the amps circuits that are gone because the amp goes is in protection with or without the sub connected. As far as power the amp runs 779w RMS while the sub is 400w RMS so I was conservative with the power and gains, I always looked after it. This is however not the first time the amps failed but last time it never turned on. I'll take it back and see what they say.

Cheers everyone for your help so far.

Alex

Try disconnecting the sub and power up the system. If the amp stays in protection mode then the output stage has blown (most likely). If it works normally, then the sub has blown.

If your sub goes faulty on its own' date=' it will have no effect on the amplifier. If you overdrive a loudspeaker with a much more powerful amp that it can handle, again you will have no problem with your amp, you'll only blow the voicecoil out of the spider. Sounds like you have some circuitry problems within the amp, probably need a check up on resistors. Overtime it does need servicing, it's electronic.

An amplifier goes into protect mode primarily to prevent you burning out the internal circuitry with an overdriven signal, and also to protect the speakers you are driving it with (mainly if the speakers and amp are matching power).

If you take it to the dealer who sold it to you, I'm 100% sure it will be repaired and restored as new. Remember, it's electronic. These things can always be fixed.[/quote']

The amp will not stay in protect mode if a speaker is blown. The amp won't know because there is no digital feedback involved to let the amp know a speaker is blown. When an amp is in protect mode, it's in protect mode because of an issue only with the amp, not the speaker.

Mil> some amps have s/c detection and will go in protect mode if there is a s/c in the output stage. Also, if an amp is in protect mode it's most likely that it's drawing too much power from the suppy therefore indicating that one (or more) of the output transistors has failed (this can also lead to a blown MOSFET in the psu)

The amp will not stay in protect mode if a speaker is blown. The amp won't know because there is no digital feedback involved to let the amp know a speaker is blown. When an amp is in protect mode, it's in protect mode because of an issue only with the amp, not the speaker.

Unless of course there is a short in the speaker