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In Reply to: I had "assumed" that ICE would stand for something exotic. "Internal posted by Duilawyer on March 28, 2008 at 17:07:14:
These have massive linear power supplies instead of switching power supplies, and are better than my system is able to reveal. I use them with what remains of the external Magnepan crossovers (heavily modified) and my replacements for the internal crossovers, with my MG-20s.
Switching amps create RF noise by virtue of their switching action. The output filter is intended to suppress the switching tone and its harmonics. The Gilmore amps have some sophistication in their output filters to improve the suppression. I don't know if your Spectron amps include this technique.
Switching power supplies also create RF noise. Putting a switching power supply next to the amplifier creates a major problem for keeping the power supply noise out of the analog circuitry.
My only modification of the Gilmore amps has been to take off their rubber feet and mount them directly on Deflex rubber sheets on end-grain butcher-block boards. These boards ride on home-made roller ball suspensions in my amp stands. The heavy toroidal power transformers can ring on the Raptor bottom panels when supported by the stock feet. My mounting scheme suppresses this ringing and improves the bass palpability.
As far as I know, the Bang & Olufsen ICEpower amps are just a particular realization of what we call 'class D' amplifier topology. There are probably some differences among designs with regards to how the control circuitry and feedback are implemented, but I'm not educated in the details of this stuff.
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Follow Ups
- I use the Gilmore Raptor monoblock switching amps. - Al Sekela 14:11:36 03/29/08 (0)
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