Step Down Transformers?!

Are you sure you need a step down transformer? Perhaps you are confusing that with an isolation transformer? And what exactly do you mean by a "30A two pole" line? That’s uncommon for household use, at least in the US, and shouldn’t be connected to a conventional 15A or 20A receptacle.

What are you building a theater? I assume the 30 amp is for the Richard Gray Powerhouse which needs a NEMA 6-30r basically a clothes dryer plug. I can’t understand what the other two 20 amps are for that Richard Gray powerhouse could almost run a house with 10 120v and 4 240 v outlets.

step down from 220 to balanced 120VAC, is the way to go...

the big deal is to use the transformer’s linear range of loading from top to bottom, for your dynamic aspects of draw.

Way over spec transformers always sound best for audio, due to the non linear and widely dynamic ranges of draw.

Many many thousands of micro and macro transients all have to be in perfect agreement with their original patterns, shapes and placment, compared to one another and as a group, in any given moment and across time --- otherwise the ear hears it.

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.