I picked up a Gilmore Lite (version 1) just for interim use until I decide if I want to keep these HE-500s and then until I decide what amp I want to pair them with. My Cute Beyond is a great little pure class A "currenty" amp with nearly "0" output impedance and ideal for my M50Ss and D1001s, but it doesn't really have the numbers down low for low efficiency / low impedance loads, so the more robust GL should be able to push about 800 mW through the HE-500.
I was impressed with the GL before (version 2) and was lucky to find another. If it doesn't work out with the HE-500 then at least I have good solid state power for home and can leave the Cute Beyond at work instead of transporting it each day.
I'm well aware the GL probably isn't going to be the best pairing with the HE-500:
- bright pads (new velours)
- bright cable (silver)
- bright amp (GL)
Hell my source (Marantz CD Player) is probably bright too, along with my power and cables and my music. But I'll bear all that in mind while I'm auditioning. I don't tend to listen at very high volume, so that should help tame the highs (see loudness contours / human hearing) and make up for the fact that the GL only pushes less than a watt.
According to Tyll's Innerfidelity measurements, the HE-500 needs 2.04 mW to produce 90 dB at ear distance (technically an efficiency of 87 dB/mW). That means 800 mW should be able to produce 116 dB peaks. Since I listen in the 75 dB continuous range, maybe 84 at the absolute most (so the numbers come out), and giving a wide 16 dB dynamic range swing (my music usually doesn't come close to that), 20 mW should be all the GL is asked to send through the HE-500 by me, which gives *another* 16 dB or 780 mW of headroom. The Cute Beyond would probably do okay but the GL is just a torquier, revvier engine. It's a Porsche inline-six vs. the Cute Beyond's leaner 2 liter four-cylinder.
Of course, all of this doesn't matter if Headroom never resolves the backorder status... No way to cancel through their website, so I'd have to call on Tuesday...