Well, in lieu of the of the fact it's been done for the last 30+ yrs....I would venture to say that it works quite well, with no issues.....unless you're running differing impedance spkr's....
I'm really starting to think that I may need to start my own website...or see if I can get the admins to start a "tech" section....there are many here who know quite a bit and can be helpful in these areas.