[aerius]

I haven't heard the Prometheus or DIY Hifi transformers yet, and I don't know anyone around here who has one. I've heard the S&B TX102, a Dave Slagle AVC, and a couple Tribute AVC's. Tribute & Slagle will both do custom jobs, if you need different spacing between steps, inductance values or whatnot, they can do it.

My personal favourite is the Tribute followed by the Slagle, the Tribute sounds like it has a wider bandwidth, more details, more speed, more goodness. Kinda like hearing DHT's for the first time but not quite that dramatic, but it's the same idea. The Slagle is no slouch itself, the difference between it and the S&B is the same as going from the Tribute to the Slagle.

I don't know how much of a difference you'd notice on a typical headphone system, most of the listening was done on a custom open baffle speaker rig using Lowther and Beyma drivers with a Heil tweeter.