Question about Cambridge Audio Azur 640P Amplifier

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Sound Distortion When listening to music (from classical LPs) phono pre-amplified by the 640p, higher volume passages sound quite distorted. I have a MM catridge and have made sure that my turntable is connected to the MM port of the 640p. Furthermore between musical cuts (where there is no music) groove noise appears to be quite audible.

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  • brackster Jul 01, 2008

    Yes. I still need a solution to this problem.
    I am using Apple SoundTrack Pro to record the records. There are now clipped signals in the recording. Yet, the louder passages of piano sonatas sound distorted. The medium volume passages sound great, very clear and authentic but the high volume passages sure sound very distorted. When I use my Technics Receiver of the 1980s, there are now distortions whatsoever, everything else being the same. The final clarity of the recording is just as good. You have to tell me, why would I still want to use your product?


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Use sonic slide switch and make ground connection between your 640p and turntable.-check cables and test with another good cables.-shut down any light dimmer around you and test.

Posted on Jul 15, 2008

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No and yes.
The phone entry, only needs a very low voltage, but you should be able to use the tape 2 entry for a DVD player or to amplify the sound of the TV. It can't be used to send sound to a device. For that you should use the Tape out or the output from the preamp. The sound should be heard in your speakers.
The voltages coming from the DVD player and the TV, could be a bit high, so if you get some distortion from oversteering the input, you should use a few resistors, but that will be to technical here.

Mar 31, 2015 | Amplifiers & Preamps

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Distortion appears while trurnning up the volume on right channell

You just need to replace your volume knob for a better one , a couple of bucks 10 dollar

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What will happen when I change speakers from frequency response 60 to 20000HZ at 60 Watts to a set of speakers from the same manufacturer to frequency response 60 to 16000HZ at 75 Watts. Everything else...

You will not get more distortion, in fact possibly a little less because the newer speakers have a higher power rating and can thus handle more power without cone breakup.
However - you indicate the the higher powered speakers have an inferior frequency response with the high end reduced from 20kHz to 16kHz - which is very surprising. This will mean that while not being any more distorted, the system will sound just a little less crisp and sharp at the high frequency end of the spectrum. Mind you, most adults over 25 - 30 years or so have impaired hearing above about 15 kHz, so chances are the difference in sound will be completely inaudible to many listeners :o)

Aug 15, 2013 | Amplifiers & Preamps

1 Answer

The left channel is lower than right, i have checked all terminals etc..

Providing the effect is there on all inputs, plus there's no distortion, the problem could be caused by an Electrolytic bypass or coupling Capacitor in the pre-amp stage or higher.
If there's distortion, the problem is in the main power amp, with the 'things' on the heat sink.

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McIntosh MA6100 integrated Amp Phoho input crackiling

These units are capacitor coupled between stages. It sound to me like one or more of those caps are defective. There is an extra stage of amplification for the Phono inputs. Check the phono pre-amp section for defective caps. Dan

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My amp won't play distortion.

Hello all you have to do is turn your master volume down to just barley on then turn your pre amp volume somwhere about 2:oclock depending on how much distortion you want ajust your volume on your guitar a little past halfway to give yourself some headroom in case you need to turn up some while you are playing! just think of it as your guitar is your first pre-amp then your amp is second preamp in line ,that is your over drive ,then the master volume is how loud you want the overall volume i hope this help's ya!

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Speaker distortion on high end

Sounds like classic dry joint on speaker terminal ROTELS are well known for it,if you can use a soldering iron or know someone who can resolder the pins where these terminals are connected,always make sure amp is unplugged from wall socket before ...

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1 Answer

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 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

Nov 12, 2007 | Cambridge Audio Azur 640A Amplifier

1 Answer

NAD C740 no longer reproducing music through loudspeakers

what was your amp? ic or transistorized? the output transistor of your amp may be opened, mostly it will short but because u still hear sound, maybe open and only the driver transistor are working. replacing output transistor or IC could solve the problem.

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