POP! noises when moving channels

[NS3474]

Hi guys/gals,

We're using an SC48 (v 2.9.1), and we're having an issue with "moving selected strips here" and "making selected strips stereo." Performing either of those actions generates a very loud 'pop' that not only goes through our FOH speakers, but is (I'm told by our MON) painfully loud on stage. Furthermore, when we go from a show file where channels have been moved/stereo'd to a new one, we get the same loud pop.

Can anyone explain this?

Thanks!

[Brent Lind]

This is a normal behaviour. This is why you have to be in Config mode to move channels. Config mode generally indicates a function that may interrupt audio.

Mute up before you set up your desk and don't move channels midshow.

[Kenmillerjr]

The console is reconfiguring things on the DSP's which causes the poping sound you speak of. Nothing is wrong with the system, it is normal.

[Jason Stygar]

does the sc48 have hard relay mutes on the outputs like the bigger consoles do?

do the bigger consoles mute when reconfiguring dsp? i know they do when you shut it off... guess i've never paid much attention to it when reconfiguring dsp.

seems like it shouldn't be painfully loud popping, as the OP suggest, regardless of whether they mute or not...

[Brent Lind]

Interesting question. I can say anecdotally that we use the Venue system and it pops, but its pretty minor and doesn't require muting the processing. Not something you'd do with IEMs on, but not that big of a deal either.

[NS3474]

Originally Posted by Brent Lind

Interesting question. I can say anecdotally that we use the Venue system and it pops, but its pretty minor and doesn't require muting the processing. Not something you'd do with IEMs on, but not that big of a deal either.

This is exactly what I thought. But now the show file changes seem to be 'louder.' Turning the board off without having to run across Kingdom Come to hit the amps is a nice touch, though.

[Sheldon Radford]

does the sc48 have hard relay mutes on the outputs like the bigger consoles do?

The analog output cards (AO16) have hardware relays for muting. These should result in a fairly low-level pop during a mute sequence, although the volume will also depend on the gain structure of the devices downstream (speaker processor, power amps, powered speakers).

Note that the ancillary I/O (2-track, monitor, etc.) located in the bottom left of the console rear is NOT relay-muted. If any of these outputs are used to drive the PA then the pop can be much louder.

Sheldon