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Did you know that the CP500 volume control does absolutely nothing when you turn it above 9.2?

That's right folks, it's a Dolby fake. The maximum volume from a CP500 is 9.2 not 10.0

You can turn it up to 10.0 but the volume - well she don't go up with it. Wonderful technology.

Steve

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Scott: The 500 is controlled by AMX automation. However, they also make the 'tick' by adjusting the volume on the front of the unit.

Brad: By 'serially', if you mean with automation then that's correct. If not, more clarification needed.

Steve: I can get ours down to 2.6, but after that it drops off at a rapid rate.

It would be nice if a transition from format to format could be 'cross-faded' as the Panastereo units do.

Michael: Yeah, but these go up to ten.

What I do know is the the maximum of 9.2 or 9.3 (you may be right there) has to do with the limited available dynamic range of the CP500, compared with an analogue processor like a CP65.

Because noise in a digital system is much more objectionable (when it is audible) than in an analogue processor, the normal operating level within the processor has to set to a higher level (relative to the system noise) than in an analogue processor. And because the CP500 has a total available dynamic range of only 92db, there just isn't enough left to allow the volume control to be boosted all the way to 10. So the CP500 firmware allows the digits to go all the way to 10 so operators feel familiar with (and warm, friendly towards) the processor, but the actual increase in volume is stopped when you get to 9.2 (or is it 9.3?)

In other words a CP500 has only about 6dB "in hand" when the fader is at 7.0, whereas any other processor has a full 10db available when you turn the volume all the way up to 10.

It's just another way that Big Brother keeps "the great unwashed" (you and me) in check.

One of these days the latter will realise that digital was invented to make manufacturing cheaper easier (and hence more profitable) for companies like Dolby, and not at all for the stated purpose of improving sound quality.

If you disconnect the automation cable that is driving the fader through that serial cable and control the volume via "remote fader", your problem may go away.

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What brings you to the conclusion that the ticking in John's CP500 is caused by the connection to the serial port?

I seem to recall that the John's cinema has at least two older CP500s which are also controlled serially by Multimation and they don't tick, do they John?