Question about Cambridge Audio Azur 640A Amplifier

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Protection mode overuse

My problem is whenever i play anything, even on low volume it will just cut out and the red light below where it says protection will flash and i have to turn it of at the mains to get it going again, yet it will do the same 5 minutes later. Anyone got any solutions? cheers.

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  • 319 Answers

Flashing protection LED indicates there is problem with circuit. Have unit serviced

Posted on May 12, 2008

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Posted on Jan 02, 2017

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2 Answers

Protection light flashing


If Richer Sounds can't detect a problem with everything disconnected and protection indicated, you need to find another repairer.

Jan 23, 2018 | Cambridge Audio Azur 650A Integrated...

1 Answer

My NAD C326BEE amp goes into protection mode at moderate volume


The protection only should come on, when the power amplifier has to give more current than it can deliver. (electronic fuse)
If in the music is a lot of subsonic, sound, so low you can't hear and your speakers can't produce, this could cause the problem. Normal CD players will cut of all frequencies beneath 20 Hz, but it could be your PC is giving everything from 1 Hz and above.
I would certainly try to play some music over a CD player and check if that would solve your problem. Not sure if that works, what you could do to suppress the sub sonic in the computer music.

Aug 22, 2012 | NAD C326BEE Amplifier

1 Answer

Jl 1000/1 goes into protective mode with low frequency


Do you have a capacitor????? If not, when its up loud and hitting hard it might be going into protection because of a voltage sag....If it goes below 11.8v they will usually do that.....Get a multi meter and put on the hot and ground of your amp when its playing loud and see what the voltage is dropping to.....If its going below 12v, thats your remedy...gd luck....

May 02, 2012 | Jl Audio 1000/1 Car Audio Amplifier

1 Answer

I have a red protection light flashing whenever i try to work my amp and i was just wondering what the solution is or how to reset it, thanks


Normally this means that the power supply or the load is incorrect.
Have you very low impedance speakers ?
Have you tried disconnecting speakers from amp and powering it on.
If it does and you do not get any protection light you need to investigate your speakers.


Feb 12, 2011 | Cambridge Audio Azur 540A Amplifier

1 Answer

Everytime I start the stereo and turn the volume up even just a tiny bit I hear a few beeps the geen light flashes goes to a pinkish red color then back to green then shuts itself off. What do I do to fix...


If the amplifier isnt burned out, there is a good chance that one of the speakers is improperly wired, causing a short circuit. The amplifier is tripping the fuse to protect itself. These fuses **** themselves every time you shut off the unit. At very low volumes, the amplifier doesn't detect the short.

Apr 23, 2010 | Car Audio & Video

1 Answer

Ill play for about 4-5 minutes and the game will freeze up.


before you play have a fan blowing on it for ten mins. then whenever you play put the fan on low while you play. it worked for me.

Jul 11, 2009 | Microsoft Xbox 360 Console

1 Answer

Sub cuts out


With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

If the voltage remains near or above 12v, the sub may be damaged. You'll need to measure the resistanace of the voice coil. It shouldn't read less than ~85% of the rated impedance.

Oct 26, 2008 | Cadence Z8000 Car Audio Amplifier

1 Answer

SOUND CUTS OFF AT HIGH VOLUME AND POWER LIGHT FLASHED RED


You need to check the DC voltage across the power and ground terminals of the amp. If the voltage drops below ~11v when the amp shuts off, you need to check the power/ground wiring and fuses.

If the voltage remains above 11 volts, you may have a problem with the load on the amp (incorrect ohm load, shorted speaker, shorted speaker wires...).

Jun 13, 2008 | Pioneer GM-X542 Car Audio Amplifier

1 Answer

Amp protection light comes on when raising volume...


It sounds like you either have too low of an ohm load or the voltage is dropping at the amplifier's power terminal.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.


If the voltage remains near or above 12v, disconnect one speaker and see if it shuts down. If it doesn't, disconnect that speaker and connect the other speaker. If it only shuts down with both speakers connected and the voltage is staying above 12v, the ohm load is probably too low and you'll need to rewire the speakers.

Dec 31, 2007 | DB Drive A460 Car Audio Amplifier

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