VTL Siegfiried. Haven't heard the Halcro, but this VTL is the best amplifier of any description that I have ever heard in my life. It makes the Ayre monoblocks sound like a mass market receiver by comparison.
Well, I don't know about absolutes or anything, but one aspect of a transparent amp, or system, is that the soundscape changes signficantly from recording to recording - that is the system tends not to be homegenized in sound signature, but let's recordings come through more tellingly and reflecting the differences between recording venues and engineering - to me, that is usually a good sign.
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