Question about Cambridge Audio Azur 640A Amplifier

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Azur 640A integrated amplifier. Protection light cuts in after a few minutes playing time (both turntable and CD player (Azur 640 C) affected)?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 31 Answers

SOURCE: Using a tube pre amp with my CA Azur 640A?

There are many answers to your questions but Ill have a go with the basics...
Audio connections should be matched.... its called Frequency impedance,.... to get a signal along wires or cables (or Fibre) the Impedance of the cables and wires must be matched to the device they are connected to transfer the signal along the cables without distortion...

Manufacturers provide many sockets on the input side of amplifiers and preamplifiers to allow the consumer to connect various devices of different impedance.

They label these inputs like CD, or Tuner, or PHONO etc etc,

That means if you have a CD player it must be plugged into the CD input socket then the impedance will be correct and the sound will transfer along the CD cables correctly, without distortion..same with the Phono input etc...
You will find on the sound output to the speakers terminals are also labelled 4-6ohm, or 8-10ohm, these are the impedance expected for the coil ratings of the speakers them selves and its important to get the correct speakers to the correct out put terminals...

In your case all you have to do is follow these simple rules and all will be well....you say you have a squeeze box well there probably isnt a port labelled squeeze box so you need to experiment and try out each input port for the squeeze box to see what input gives you the correct sound output...Watch the Phono inputs as these are very sensative to input sound levels and must be treated very carefully as they have a double stage of sound amplification and as such you need to have the volume right down when connecting up the Phono inputs then increase the volume carefully after the cable connections are completed.

If you follow these rules then all will be well,,,,there is no difference if the Pre amp or Power amp is valve or transistor or FET or has IC outputs to the speaker the same impedance rules apply..just treat it as a box with input and output terminals and all the impedance will be taken care of for you...if you read the lables...

You need to connect you signal source to the Preamp inputs the out put from the Preamp connects to the power amp input then the power amp output goes to the speakers. this is a basic configuration for sound systems, there are other variations but are outside this discussion.

Cheers From YUBEUT

Posted on Nov 16, 2007

marsrover
  • 682 Answers

SOURCE: 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.

Posted on Jul 13, 2008

fixyathing
  • 341 Answers

SOURCE: The left channel in my cambridge azur 640

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

Posted on Aug 03, 2009

Grubhead
  • 5017 Answers

SOURCE: Just set up my brand new cambridge audio azur 650a

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.

Posted on Feb 19, 2011

rajsun22
  • 73 Answers

SOURCE: cambridge azur amp 640a working

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.

Posted on Mar 06, 2011

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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

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

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

2 Answers

My azur 540a/640a v2.0 amplifier is not working.


Loud buzzing normally means dc on output or through your spaeker,amplifier needs to be serviced as it is faulty

Dec 25, 2008 | Cambridge Audio Azur 540A 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

1 Answer

Protection mode overuse


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

May 10, 2008 | Cambridge Audio Azur 640A Amplifier

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