Just a quick comment. Torus is not Balanced power on the output like Equitech. It take 120 volt or 240 volt on the input and 120 volt on the output. The beauty of this is Torus Isolation transformers can utilize AFCI breakers on the output which is a requirement in any Dwelling unit in the USA.
I have been studying power for a long time now. I am very hesitant about power conditioners. I have tried many, heard them all, liked a lot of what I heard and had issues with some stuff. I would ask Mike L, are you sure the wall is not better than from your Equitech with your Dartzeel. He was adamant the isolation transformer was better. I was still hesitant as the "online" chatter was a transformer limits current delivery. Well, I finally decided to try one for myself. I was absolutely floored in what I heard. Better dynamics, better bass that integrated with the upper frequency range. A quite in the room. Not a black, just a calm. Better resolution and inner detail. The soundstage expands and moves up and out. There is 0 that comes across as a negative. I then went and bought a demo RM20 and took it around to people I know. If someone did not have any power conditioner, they bought it. If they had a different conditioner, they sold the other and kept the Torus.
Something to consider about a Torus transformer. You can't just throw it into a system and get all it has to give. An isolation transformer is very reactive to the power it is delivered. The better the grounding, service, feeders and branch wiring, the better the Torus will function.
I am updating my website this week. The update will reflect where I find the greatest band for the buck when building out your electrical infrastructure.
#1 Torus Isolation transformer
#2 Dedicated lines to your equipment. With or without a Torus.
#3 Corrosion protection/Removal of all aluminum. These 2 are very similar in affect and intensity so I rate them the same.
#4 Better branch wires
#5 damping mechanical vibrations
My experience is that all systems perform at a higher level with a quality isolation transformer. The only 3 I would call quality are Torus, Equitech and Controlled Power. The others such as Triplite, Topaz or industrial units are not the same. Torus stands apart from the rest as it is an amazing RF filter, uses NEC required AFCI breakers, has 2 types of built in surge protection, can be configured with automatic primary voltage selective taps that maintain 120 volt output with sags to 90 volts and surges to 130 volts. All the primary and secondary code required disconnects are built into one box. You don't need any disconnect switches on the wall to install it.
If you believe, which I don't buy into anymore, that you need to "Isolate" your server, preamps and amps from each other, then go ahead an put another filter on your rack that does as such. You will probably remove it in short time. What you do need is "#2 Dedicated Line". You never want everything on 1 branch wire and 1 duplex.
Last, I have never heard a RM20 in a room. Dead silent. Any larger and you want to have some way to potentially encase hum. I have set RM40 in rooms and if they are in a open back cabinet, the front and sides are plenty to keep the hum from being heard at the chair. You have to climb up to the rack to hear it. I prefer to put larger isolation transformers on a wall outside the room. The branch from the Torus to the duplex should optimally be 20 feet or less. 40 feet max, no more.
OK, sorry for the sidetrack, back to the Gryphon Thread.