Which components knocked you out on first listen?

Recently, when I switched back in the DNM Reson ICs in place of some others (MIT and Harmonic Tech), they surprisingly knocked me out with their tonal clarity and seeming coherence and have taken over my system since.

Massed strings on Magico mini's with good tube amplification almost floored me couple years back when I heard them.

Also recently, a pair of GOTO custom horns of some high end tube electronics and vinyl rig at Capital Audio Fest knocked out most everyone I encountered who heard them with various classical and jazz pieces played.

My current system setup overall mesmerizes me regularly, particularly with the OHMs, but it took a good bit of tweaking and refinement to get it there. If I allowed it to knock me out, I'd be dead and buried by now.

Klipsch LaScalla
McIntosh C32
McIntosh 6200
Krell 300
Wilson Watt 2
Wilson WAMM
Thiel CS 3.5
Thiel CS 3.7

JL F100
JL
F112
JL F213
JL F113
B & W 802D

EgglestonWorks Fontaine speakers - my first, and still current, main speakers. I had auditioned several speakers for my first venture into high end audio. Up until then the speakers (all far cheaper, retail-wise) I heard were nice, and obviously better than my current low enders, but none knocked me out. When I auditioned the Fontaines they knocked me out cold. At that moment I knew I had to have them and begin a pursuit of high end sound.

My wife was pissed at me when I got home with them for blowing my budget, but after setting them up and selecting the "Miss Sarajevo" track on the Passengers CD, she was equally floored and thus quickly forgave me. These speakers really are special.

The NAD 1020 is a pretty decent mid-fi component, yet a direct swap out with the ARC had me amazed at the depth of sound and clarity. This was especially noticeable with complex or classical music, where some of the 1020 rendered muddled, ambiguous content, while the ARC resolved so much better.