Amps bridged to mono with 4 Ohm Magnepans?

Hi all,

My current amp is rated at 200/300 wpc @ 8/4 ohms and bridged mono at 600/850 w @ 8/4ohms.

I am considering getting a second amp as a mono block for my Maggie 3.6s,(at this time I am not considering active or passive bi-amping), and I have a 3-part question;

Most amp manufactures only list their 8 Ohm bridged output and not their 4 Ohm. I assume they don't recommend bridging to 4 ohms because;

1. The S/N spec would be through the roof. Correct?
2. The power draw from the wall would be too high (Energy Star and such). Correct?
3. Related to No 2. I suspect, the amp would get too hot and go into protection mode. Correct?

The bottom line is that I don't want to damage my Maggies or amp. Should I just stay away from bridging, or could I consider it for a manufacturer that lists their 4 Ohm specs?

Thanks!