proper way to turn off my amp?

I always turn off the amp at the source, then switch the furman. The amp is always the last to go on and the first to go off.

 

If you power everything down simultaneously via the power conditioner, your compressor might go first and send a loud pop or thump. If the head takes an extra second or two to fade out, that might stress it out, along with the speakers. But not if you turned it off first.

For that reason, it's usually good form to turn the your head (or any power amp) off first (and on last).

 

When I get done playing, I typically turn my amp's master volume all the way down, and let it sit that way for a few minutes before shutting down - that way, the fan gets a chance to cool the amp down a bit inside before I shut it off... After the master volume is all the way down, you can shut off everything else without any ill effects...



- georgestrings

 

With the Shuttle, if you turn the master volume down, it doesn't matter what order you turn the rig on and off. In fact, the mute circuit is so fast that it may not matter even if the master volume is up. There's also inrush current limiting on the amp's power supply so it won't damge the switch on your Furman either.

 

The thump from playing is generally enough to send the amp into the limit threshold. The turn-on and off transient "thump" is generally rail to rail and enough to jam the power amp rail to rail beyond the limiter and there may be a lot of high frequency energy contained too. It's quite a "bang" in some cases.