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

Posted on May 12, 2008

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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.

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Running four S70 Siroccos off the amp, everytime volume gets halfway the protection is cutting in with protection light flashing three times? When reducing down to two speakers amp cuts out three quarters...


You are overloading your amp. IMO 640A cannot handle heavy loads.

Better change the speaker combo and connect something that puts right load on the 640A. Else, get a meaty amp from CA.

Mar 04, 2011 | Cambridge Audio Azur 640A Amplifier

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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.


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McIntosh 6100 Integrated vintage 1976


Most likely, one channel is blown plus power supply capacitors have to be replaced, switches and controls cleaning, all lamps replaced. That would be an average repair on that model.

Nov 11, 2009 | Mcintosh Amplifiers & Preamps

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I have the Multi Channel VSX-D2011 which is fine when used at low volume. As soon as the volume rises to a fairly normal level the amp cuts out and switches off. Any ideas?


Hiya,

First try checking all the speaker cables and speakers. Listen to them all make sure they are all playing when playing softly, if not there could be a short in the speaker cable/speaker causing it to protect. Another way, disconnect them all and connect one at a time, test it etc, when the fault re-occurs, in that line.

If thats not it then sorry will have to go to a tech as it sounds like protection is kicking in or PSU fault

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Normally this denotes a protect condition. Remove the speaker wires from the back of the amp and see if the green light stays on. If this fixes the problem, then there is a short circuit in your wires, speaker level volume control or speakers. The amp sees the short and goes into protect. After a couple seconds it closes the connection again and if the short is still present it goes back into protect.

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1 Answer

Problem with azur 640a amp


protection mode activated to protect your amp from a problem.
please disconnect all your speaker from the amp and check if it is fine start to connect your speaker one by one until you find the bad one which make the problem-change its cable first and then speaker itself.if the problem still you will have a problem in amp.

Jul 08, 2008 | Cambridge Audio Azur 640A Amplifier

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Make shure your speaker wiring is solid hookup to amp and spekers (NO CROSSED WIRING). Also make shure speakers are not wired in parallel or the speaker impeadance will be to low and amp will kick out.Turn speakers off then hook up headphones and crank up volume then see if amp kicks out.If it does you have an internal overload and needs serviced. If it playes ok then you must have speaker problems or wiring.
GOOD LUCK
BIGREDl

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1 Answer

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Eltax AVR-200 will start up in protection mode if the amplifer went into protection mode due to high volume before it was turned OFF and it will start at the same volume level as it had before power OFF.

To correct this you must shift to another input without signal, then turn the volume down before it goes into protection mode again.

Jan 12, 2008 | Amplifiers & Preamps

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