Question about Cambridge Audio Azur 640A Amplifier

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Probvlam with my cambridge audio 640 a cutting out

When i play any music at quite high volume it plashes 3 red dots and cuts out, the amp is hot but its not the warning for overheating. I originaly thought it was a problem with my amp but this is the second amp after getting the first one replaced. Could it be a problem with my speakers. They are correct power and ohms. Thanks K

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Check operations manual for indications as you described. Amps MUST have adequate ventilation. Make sure unit is not in small, semi- closed space or on top of other warm equipment. Check for speaker impedences match that of amp

Posted on May 30, 2008

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Why does stereo amp cut out at higher volume


You seem to have the answers to your question. I would just resolder the connections anyway without checking. If it solves the problem you have saved yourself a lot of money. If it doesn't follow the other steps in order of cheapness!

May 03, 2013 | Amplifiers & Preamps

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

Amplifier thermal fuse cut


The capacitors in the power supply might indeed cause the humming noise. This could be the 50Hz mains hum getting in.
I can't tell you if having four amps on top of each other is the cause of the problems your experiance. What I can say is that anything running at temps to fry eggs is a fire hazzard. And that might mean extra cooling is needed if you want to be safe. You should also check each amp. I would do this by seperating the amps to see if one of them is making more heat than the rest. If that is the case then you might have a part - a semiconductor - that has a thermal problem.
The capictors will fail if they are having to deal with excessive heat also, that's if the amps don't burn the house down first!

Jun 24, 2012 | Bose Amplifiers & Preamps

1 Answer

I have a 2000watt 4 channel. When I tun the music up to a moderate level the amp begins to cut in and out. I watch the blue light fade in and out. The amp is not overheating because it start as soon as I...


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted or, again, evaluate the impedance load. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a possible root cause for intermittent shutdown.

Jun 12, 2011 | Audiopipe Amplifiers & Preamps

1 Answer

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

1 Answer

Just set up my brand new cambridge audio azur 650a amplifier. It keeps cutting out with the protection light blinking three times indicating "overvoltage" according to the manual. I'm using it at...


Just make certain that the connections are all good with no wires touching. If it still doesn't perform after that return it to where you bought it and get a new replacement or your money back.

Feb 16, 2011 | Cambridge Audio Azur 650a 2Channel...

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

Same problem, amp cuts out if volume too high


Use a multi meter,set it to 12v,turn system on use some bass.while music is playiing hold pos of multi meter to poss- neg to neg- on amp see what voltage is running at at what its dropping to it sounds more like a voltage drop problem.if you hooked it up back words u could fry unit..Have you done the big 3.what size is your alt,and what is your amps draw..

Aug 26, 2009 | Amplifiers & Preamps

1 Answer

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

Aug 03, 2009 | Cambridge Audio Azur 640A Amplifier

1 Answer

Cambridge 640 amp, levels coming out r and l are different


Adjust "Balance" to center. If at center, something more serious in amp.
Paul

Jun 07, 2009 | Cambridge Audio Azur 640A Amplifier

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