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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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.

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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)

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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

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