I've got a line on an out-of-state ABM600 Power Magnifier, and I can't find a damn thing about them anywhere. It's a power-amp only, no pre, 320W per side @4ohms. Anyone have any knowledge/experience with this amp? I've liked every Ashdown head I've very played, but their ever revolving product line-up, and that I can't play before I purchase, concerns me. thanks.