According to the manual, yes it does shut the amplifier down. Alpine's
reasoning is that sound quality will improve slightly, due to it being
turned off.

wrote in message
oups.com...
I had a problem last summer with the sound cutting off when it was real
hot. Real hot as in the sun beating on my black suburban in 90 degree
heat all day. I turned on my CDA9813, drove away and in a minute or so
no sound. If I turned the unit off then on again, I had sound. I'm sure
it's just the internal protection shutting down the unit to prevent
damage.
I just realized last week that I had the internal amp set to ON in the
setup. I don't need it because I have external amps.
So my question is, now that the internal amp is set to OFF, is it still
technically on but just not providing output, or is it really turned
off - as in not generating any of its own heat?

Thanks,
Mike