A&H Mixwizard issue

[david.elsbury]

Hi there

At work we have 2 A&H Mixwizard 16:2's. If phantom is on, and you plug a mike into any input when the Left/Right faders are up, then there is a "pop" thru the speakers. This happens if it is a SM58 or a condenser. Does this happen to anyone else, or am I alone?

 

Also, we often hook up a powered speaker to the phones output, via the A/B out. Whenever the PFL is activated, there is a similar "pop" thru this speaker.

 

Sorry to disturb if this is an isolated issue, just thought I'd get some other's feedback on the issue.

 

Thanks

David

[peter]

Microphones should be connected and disconncected whilst the system is powered down, or at the very least, whilst phantom power is turned off. I've always been told, though I don't quite understand why, that connecting microphones with phantom power on can cause them to fail.

 

Similarly with amps (or powered speakers) - they should be turned on AFTER the mixer is powered on and everything is connected up. They should also be turned off BEFORE the mixer. Both of these is to remove the potential for the power on surge to be routed to the amp inputs.

 

HTH

 

Edit: I don't do sound, but I thought SM58s didnt require phantom power to be activated.

[PDD]

I don't do sound, but I thought SM58s didnt require phantom power to be activated.

 

They don't, but I should think any mic will "pop" if you plug them whilst the system is live and the phantom power is on. Not good practice as you say.

[ojc123]

Have a look here for some more on this issue.

 

(protecting compression drivers)

 

I destroyed 4 out of 6 HF drivers because my students plug stuff in without taking the faders down. It is now commandment #11 in our theatre.

 

If you notice a loss of HF in your cabinets you've probably done it too!.

 

I don't really know why it happens but it does.

[david.elsbury]

I don't do sound, but I thought SM58s didnt require phantom power to be activated.

<{POST_SNAPBACK}>

This board only lets you switch phantom on or off globally. Hence if using DI's then phantom is usually on.

Microphones should be connected and disconncected whilst the system is powered down, or at the very least, whilst phantom power is turned off. I've always been told, though I don't quite understand why, that connecting microphones with phantom power on can cause them to fail.

 

Riigghhtt... that sounds like something I should have picked up upon a long long time ago... thanks :( I will bear that in mind.

 

David