Surge protector vs wall debate for amps

If you can find a power conditioner that doesn't restrict current flow, then go for it. I've found the purest sound from a power amp is running it thru the wall receptacle, provided you have a dedicated line. That's why I suggested a power strip without filtering.

The conditioners that do not limit current or colour the sound are often very pricey.

Torus claims that their units not only don't limit current, they provide a short-term reserve due to energy storage in the large toroidal transformer. The RM-20 weighs considerably more than the Bryston 4B3 it's feeding. But as @masi61 said, they are not cheap. Sometimes Torus has a demo unit available.

Brick Wall, I use their 20amp 2 outlet for large current amps and the 15amp 8 outlet for electronics.  Simple and not that expensive, 289 for the 8 outlet.

I have a Pass XP-22 pre and X-250.8 power amp and currently live in a rental house. Rewiring was not an option and the landlord did not want a whole house surge installed. I also have a bit of $$ in a TT setup so I was very concerned about both crapy electricity as well as surges. 
I confirmed with my insurance that I have protection from lightning AND power surges. The wording in the policy says.

 “Increase or decrease of artificially generated electrical current to electrical appliances, devices, fixtures and wiring.” 

Once I got that confirmation IN WRITING I bought the Torus RM-15. I would have bought the RM-20 but this is a temporary living situation and I wanted to save the $1k between the two models.

I feel much better as to surges and still know I am covered if the RM-15 fails to protect. We must have some dirty power here because I have noticed a little deeper soundstage as well as more detail. I AM THRILLED.
The X250.8 is a great amp with good power. However, it is not nearly as high current as Nelson's class A amps and the Torus does not seem to be limiting any dynamics. So, I am confident that you will be fine with the RM-20. If you own your home I would suggest a dedicated 240V line and buy a balanced RM-20.

Bye the way, make sure your insurance covers replacement cost and not just replacement value. Good luck!

Bruce

Just got the new Audioquest Niagara 1200 with a couple of high current outlets for amps. Not enough time with it to be 100% sure, but I would say it was an improvement SQ wise, and a piece of mind with the protection.