Question about Cambridge Audio Azur 640P Amplifier

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640p sound error

Hi,

I'm finding that my 640p is cutting the volume and fidelity from the cd/tuner when its plugged into the system.

i have a technics sl1800, a naim hicap, naim pre and power amp which are installed correctly..(i think) the CD and tuner work ok yet when i plug in the 640p to the av outlet on the amp after 15 secs when the phono comes on line the sound drops.

any help would be gratefully received!

cheers

Posted by on

  • stiggy2 Mar 17, 2008

    Hi thanks for the info! human error was at fault here! this question can be closed...thanks for your help

  • Rob Galayda May 11, 2010

    ummmmmm...why would you be plugging the 640 to the AV OUTLET on the amp......



    Are you plugging the 640 into the mains for power? or are you plugging the output of the 640 into the output of the amp/ pre-amp.....



    I don't quite understand the question.



    If you were plugging the output of the 640 into an output of the pre-amp, it would be like 2 cars colliding head-on. The bigger car would "win"......thats why you plug the output of the 640 into an INPUT of your pre-amp....its like 2 cars following each other nicely down the motorway.





    More information is needed for me to help you...



    Thanks



    Rob




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marsrover
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SOURCE: Sound Distortion

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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caroldon
  • 17130 Answers

SOURCE: Re: Technics HD51 home stereo system (amp, tuner,

The Amplifier must have a high impedance input for the turntable to be connected. Now most of the present day amplifiers do not have this input but only the regular aux input which is designed for a larger signal . But the turntable outputs is quite low and so it requires an amplification of high order. What you can do if you need to play the turntable is to have first a preamplifier with a high impedance which is available even inkit form and can be fitted on to your system. The preamp output can be shared into the input of the source selector maybe with a switch and you willl be able to fix two RCA sockets to accept the input of the phono. This will work fine provided the shielding is done well to avoid the high feedbacck to oascillate and cause noise, the premap must be housed in a shielded cabin. On the other hand you may have to buy a universal amplifier so that the phono input is present. Definetely nothing better than a designed input. So think and decide. hope I could help; Good day

Posted on Aug 10, 2010

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