Can you leave class D amps on and not ever turn them off?

rvpiano OP
George,
You mention NuForce 8 monoblocks as having gone up in smoke.
Would you suspect the Nuforce 9's as having  the same problem?

Many use the same generic SMP boards from the same manufacturer just different rail volts, so it wouldn't surprise me if they were similar.
See this post of a Nuforce 9se v3 I posted in Stereophile and what it did to a reviewers pair of Wilson Watt Puppy 8's, this wasn't a powersupply issue just the nasty noises the 9se made.
http://www.stereophile.com/comment/561214#comment-561214

Cheers George

George can you give us a couple of examples of the ones that go up in smoke?

Ones I remember
Panasonic PVR's, dvd/cd players, Samsung, Panasonic TV's,  2 x Velodyne CHT15 subs, 1 x Alesis 620, 1 x Nuforce 8 monoblock, 1x Halcro DM68 that had to be shipped back to manufacture. 1x Behringer B2031A, 2 x Behringer active xovers. 
These are ones that were left on or in standby.

Many others were blown and popped their fuse but didn't fry up. 
Countless smp battery chargers, some of them liked to fry with much crackle and big smoke.

Cheers George

BTW, I have never experienced an SMPS giving up on me.... All have been rock solid.

But if/when they go, it’s with far more fireworks that linear ones, and they’re not as tolerant to being out of spec as linear ones either. When/if just the caps leak in linear ones they just smell and sound crap, but smp ones can go up big time if the caps go out of spec.
I repaired too many to trust them being left on and home alone, and it’s usually the whole smp board that has to be replaced as the boards/tracks get fried/burnt beyond being fixable.

Cheers George

I don’t trust SMP power supplies, they are finicky to component (caps etc) aging

Most Class D’s use smp (switch mode) power supplies, they do go up in smoke a bit more frequently than linear ones, and can be a fire hazzard if not at home.

Cheers George