Tbg:
My AMR fuses just arrived.
As a matter of keeping it a controlled experiment, I changed ONLY the fuse in the PS Audio Power Plant 300 (which,for the past year, has had a 5 amp, slow-blow, HiFi Tuning gold fuse in it). I wanted to hear only the change in the the preamp and CD player, which are both hooked into it (the Power Plant).
Quite a revelation for a cold fuse: I played the Katchaturian ballet (the full ballet on RCA Red Seal) and in the opening number, the cymbal crash, which splintered every time it played, held together from initial transient thru to decay. The placement of instruments - and, as mentioned by someone else - their "body" (physical density) is considerably improved so that, while I cannot see the trumpets "side by side" as I have other systems in the past, I can hear the harmonics of several separate ones in the section, so there is more separation and individuation of instruments. And not merely instruments within one group: instruments with different tonalities and timbres (flute, piccolo, oboe, violins, triangles) playing all at the same time, exhibit their individual tonalities, so the music makes more sense, as you can hear more of the composition instead of a mildly blurred - no, make that homogenous - chorus of sound. It's quite involving.
I have one WA Quantum fuse chip left, which I will put on the AMR, but not for until Saturday, after I've had some time to listen to different CDS and types of music.
That said, the AMR made the HiFi gold 5 amp fuse that has been in the Power Plant for the last year sound confused, jangly and even "lean." It was very interesting to hear the placement of instruments, as well as the air gently expanding around them, which, it would seem to me, indicates a coherence from midbass thru, at the very least, the lower treble. (My Hurricanes are not the most extended amps at the frequency extremes, but when I put in the 10 amp fuses I bought - which will replace the Synergistic Research SR 20s - it should be a VERY interesting experiment!