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Posted on Dec 29, 2009
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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 speaker on the amp. If I touch the contact with left speaker contact it briefly works and then cuts out and 'Protection' light flashes red. I have Eltax LR 6.5 speakers. Any ideas on fix? Not sure if I need to replace speakers or speaker cable or even the amp!! Please help. Thanks.

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Grubhead

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  • Cambridge Audio Master 5,755 Answers
  • Posted on Jan 04, 2010
Grubhead
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Joined: Jan 21, 2009
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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!

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Related Questions:

0helpful
1answer

CAMBRIDGE AUDIO AZUR 640A: when i switch the unit on the left hand channel is distorted. after a few minutes it settles down and is ok from there on in.
The first thing I would try is swapping the speaker wires on the back of the amp and see if the problem moves as well. Then you know what your speakers or speaker wire. If that's not the case, then try switching the left and right
from your sources and see if the problem follows. This should get you a pretty good idea of what's wrong
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Jan 20, 2019 • Cambridge Audio Audio Players & Recorders
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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.
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Oct 06, 2014 • Cambridge Audio Azur 640A Amplifier
1helpful
1answer

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.
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Mar 04, 2011 • Cambridge Audio Azur 640A Amplifier
0helpful
1answer

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.
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Jan 06, 2011 • Cambridge Audio Azur 640A Amplifier
0helpful
1answer

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.
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Dec 08, 2010 • Cambridge Audio Azur 640A Amplifier
0helpful
1answer

I have a cambridge 640a amp and the inputs light are off without any sound coming out of the speakers.
audio amplifier IC´s damaged need to be replaced
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Sep 24, 2010 • Cambridge Audio Azur 640A Amplifier
0helpful
1answer

Hello, I am trying to plug my Mixer into my amp but only one speaker has sound..I am using a Rane ttm57sl mixer with technics turntables & cambridge audio azur 640a amp...I've gone from the Aux out on...
Why don't you try using the main outputs (the 2 XLR connectors). With 2 cables connect these two (left - right) outputs at your amplifier's aux in. In that case take care that the "output level" of the mixer works like master volume controlfor the signal that the mixer sends to the amplifier.

In case of a problem or clarification, don't hesitate to post.

Thanks and regards
Please kindly rate this solution
Stelios
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Feb 04, 2010 • Cambridge Audio Azur 640A Amplifier
0helpful
2answers

The left channel in my Cambridge Azur 640 amplifier keeps cutting out. Wierdly I can often 'shock' it back to life by quickly turning up the volume a lot. Any ideas?
have the volume control cleaned by a spray of electronic contact cleaner. If the carbon coating material is already wiped-out due to use, have the part replaced
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Aug 03, 2009 • Cambridge Audio Azur 640A Amplifier
0helpful
1answer

Cambridge 640 amp, levels coming out r and l are different
Adjust "Balance" to center. If at center, something more serious in amp.
Paul
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Jun 07, 2009 • Cambridge Audio Azur 640A Amplifier
2helpful
1answer

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.
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Jul 08, 2008 • Cambridge Audio Azur 640A Amplifier
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CAMBRIDGE AUDIO AZUR 640A: when i switch the unit on the left hand channel is distorted. after a few minutes it settles down and is ok from there on in.

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