Step Down Transformers?!

Yes, yes, and yes!

I am indeed building a theater...I pulled the other two dedicated 20 amp circuits for subwoofers (stereo subs, each on their own).  My idea was/is to use the stepdown/isolation transformer for processing and main amplifiers.

I was and am thinking the Richard Gray Powerhouse, but interested in other ideas depending on what is available and what folks have experience with.

Open to other suggestions!

No personal experience with the Richard Gray but I get good results from a Torus WM-75 used in such a capacity (ie 220v balanced in to 110v lines out)

Bearotti, you’re on the right track with 240V/120V. I use the RGPC RM Pro that delivers 4000 watts and the RGPC 1200C for the front end, which is also power on demand---their ISO Gray combination. The Power House contains both of these, I believe. The advantage there is that your nice power cords come right off the transformers, but you need a wall receptacle for the unit in most situations. The Torus line is very, very good. The WM line offers more power---would probably have gone with that but I got my stuff for cost at the time.