Question about Cambridge Audio Azur 840A Amplifier

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I am not very technically literate with respect to audio/video. I purchased a Cambridge Audio Azur 840a V2 Integrated Amplifier last week to replace an Arcam A70. I have a pair of Tannoy DC3 speakers, as well as a speaker switch unit for 6 in wall/ceiling speakers. I hooked up the Tannoy speakers to "A" and the speaker switch to "B" on the amplifier. A couple of times during the week I would get a message of "spkr short" when I would turn it on. The manual said to check the speaker wires, which I did and found nothing wrong. After this happening 2-3 times over a period of a few days, I got a "dc error", that would not go away. I returned the unit to the store and they replaced it. I installed it yesterday and it was fine, until I turned it on this morning and again got the spkr short error. I spoke to the store where I bought it and they had me try all types of things, including: - check my speaker wires for loose strands (found nothing) - they told me I should run all my speakers, including the Tannoy main speakers through the switch (after doing so, I again go the spkr short error) - they suggested trying with only speakers on A or on B. (I tried both individually and again got the spkr short error). I'm completely stumped and don't know what I am doing wrong. The store told me an amp will take a short for a while, but eventually will stop, and this is what happened with the first one. I expect the same will happen with this replacement. Can anyone help or suggest what might be wrong?

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  • mitchell_laf Dec 18, 2008

    I will buy the unit and try, thank you. For reference, I tried putting the main speakers through the unit too and had the same problem. My understanding is these units are supposed to have impedance protection and it should not cause a problem. I also tried individual speakers to my ampl... same problem, and just the speaker switch to the amp... same problem. What I don't know, however, is if perhaps the amp is now somehow "damaged" and that anything I do will be the same. I will buy the meter and try.

    For my reference, you say I simply test each wire and it will give me an ohm reading? So this will help diagnose if I have an issue. Do I test this with the wires active and the speakers working or turned off or....?



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Get an Ohmmeter, take a reading on each speaker line one at a time, on both A & B speaker lines. You should get a reading of 8+/- ohms. The speaker switch with the 6 spks will probably read almost 0 ohms when all 6 are running. That is what your amp is not liking. Try running it with one set of speakers on the switch,with the Tannoys on ch A on your amp and the switch on B. add one pair of the 6 at a time and you'll see that it won't like all 6 at once. 2, maybe 4, at a time is probably what you'll find to work.
Good Luck.

Posted on Dec 18, 2008

  • Marc Wiggins
    Marc Wiggins Dec 18, 2008

    before you buy the meter, disconnect all speakers from the amp(including the switch). With no speakers connected, play a CD, turn the amp volume to 50% and see if the problem shows up again. If it does, take it back and ask the store to do the same test. If they will let you, get another brand or model amp. If they will only exchange for the same model, insist they 'burn test' it for a few days.
    Is the problem does not re-occur with no speaker load, check each line with it not connected to the amp or switch, just the speaker. this is where the multi-meter will come in. You should be able to get for $10+/-. let me know what you find.



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