hey ya all, new board member here...
I'm the original owner of a pair of L100T's I got back in 1990 or so. I'm finally getting the 2214H woofers refoamed after many years of neglect... My stack is an Adcom gfp565 preamp, Adcom 555-II tuner, an inexpensive Yamaha CD player, a Denon quartz/beltdrive turntable, and I have both of the above amps...
the GFA-585 is a real beast. it dims the lights in the room when I switch it on. I believe its rated at 250W RMS DC to daylight, but only if you put it on a dedicated 15 amp A/C circuit Its also a real monster to lever up onto my amp shelf which is at the very top of a narrow 'closet' built into the living room wall, I think it weighs like 80 lbs.
i've always liked the xl280, its just a sweet amp, never given me any grief, and its whats up on my amp shelf right now... I think it was rated at 140W RMS dc to daylight per channel, but we pulled something like 200 watt RMS sine waves out of it on my friend bench with a dummy load (a 8 ohm heater element) and a signal generator input and it just got warm (we put fans on the heatsinks)...
I listen to a wide range of music, from acoustic modern folk music to bebop & free jazz to loud rock of the SRV variety, and even occasionally Reggae or somekinds of modern rock. Got a big house, and when the girls are gone, sometimes I like to crank it up, hard.
so... whats the consensus? stick with my XL280, or lever that adcom back up in its place? The adcom probably has 3dB more headroom than the Hafler, but at the expense of dimming the lights
at 91dB/watt, I'm not sure the L100T's need that kind of power