Question about Cambridge Audio Azur 640A Amplifier

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Protection snaps into action intermittently

I have an Azur 640A hooked up to various devices - DVD, PVR, Apple TV - and on all audio sources the amp will intermittently snap the speakers as the protection kicks in and turns the volume to zero.
It's not particularly reproducible, except that it happens many times a day (2-6 depending on my luck). I haven't had such troubles before. 
It doesn't look like my wall outlet has a separate pin for grounding. Could that be the problem?

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  • 44 Answers

I don't think the pin or third prong on your power cord would be the problem, but I would make sure that all of your speaker wires and connections going to your amp are not shorting out against eachother.


I hope this helps you out.

Posted on Apr 01, 2008

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1 Answer

Cambridge audio 640a problem, olume goes to zero, I hear a little bang on speakers, light starts blinking!


This sounds like there's an overload in the main amp section. Often caused by a short-circuited device.

Oct 06, 2014 | Cambridge Audio Azur 640A Amplifier

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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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Volume goes to zero and protection light comes on, any idea what the problem is?


Check the speaker wires for a short. Try operating the amp without the speaker wires hooked up.

Feb 27, 2011 | Cambridge Audio Azur 540A Amplifier

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HI, Can the Cambridge Audio 640a integrated amp be used as a preamp if I buy a separate power amp.


Of course, just run an audio RCA pair out from the Pre Out to your next amp and any input. All control for volume, tone, etc will remain with the 640A.

Jan 26, 2011 | Cambridge Audio Azur 640A Amplifier

1 Answer

I have a Cambridge Azur 640A amp, every time I turn the volume up to over 12 oclock the amp shuts down. Can this be changed? I presume this is a safety mode on the amp. Can you help?


Yes, you are right. That's a protection feature to prevent burnouts. Typically it appears when your speakers are sucking up a lot of load from the amp. Please check your speaker impedance and the amps' output impedance and ensure the wiring are properly done. Some amps are soo sensitive that they may cut-off after certain level due to overload.

Jan 06, 2011 | Cambridge Audio Azur 640A Amplifier

1 Answer

My CA Azur 640A v2 just cannot get out from standby because of protection circuit. the red light blinks showing that DC was measured at terminals, no matter if speaker cables are pluged in or not. In...


Most 640As suffer from this sensitive issue. It is not a fault, but a protection mechanism that is too sensitive. In some cases, it could be due to the open ground earth issue or Left & Neutral reversed at the wall plug. Check your wall plug's connection and if they are perfect, then it could be because of a electrical issue inside the amp. In that case, get the technical support from CA to fix this.

Jan 03, 2011 | Cambridge Audio Azur 640A Amplifier

1 Answer

Red light flashes - will not work - could it be dust in the amp?


hi,
its not because of dust. AZUR 640A offers loudspeaker protection if the output of the amplifier goes to a high constant voltage (DC) because of some internal fault. This is a rare fault although detecting it could just save those expensive loudspeakers.
Due to the necessary sensitivity of the DC protection circuit, hard clipping of the amplifier may cause DC protection to be triggered. If this fault occurs switch the unit off, power up again and check
operation with a reduced volume level. If the DC fault occurs again contact your dealer for service.
ok

Dec 29, 2010 | Cambridge Audio Azur 640A Amplifier

1 Answer

Cambridge azur amp 640a working brill till yesterday !! now protection light !!!! turned it off numerous time etc plenty of venterlation carnt get it to work


Looks like the fuse blown.. or the classic symptom of electrical fault inside the amp. 640A uses a sensitive protection circuit often ends up in this irritating situation. Normally, there is nothing much you can do, but just check your wall plug connection for Open Ground or Left & Neutral reversed issues. If the wall plug is free of error, then you should better contact CA technical support.

Dec 08, 2010 | Cambridge Audio Azur 640A Amplifier

1 Answer

I have cambridge audio azur 640a amp. Problem I have is only the one speaker is working. Both speakers seem to be ok working off the left speaker terminal. Seems to be problem with output from right...


The fault is on the amp! It sounds like the protection circuit is detecting a surge on the channel and shuts it down to protect the speaker. I would check the semiconductor device(s) for the right channel on the heatsink of the amp. You might even see damage of burning on one!

Dec 29, 2009 | Cambridge Audio Azur 640A Amplifier

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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