Withdrawn Sonifex RB-HD1 Headphone Amplifier - One Output In perfect working order & excellent condition (marks around rack mount holes)..mains lead...sorry no original box Has been used in a rack for our drummers wired in ear. Collect or £12 postage A rack-mounting stereo headphone amplifier for driving up to two pairs (in parallel) of professional stereo headphones from a single stereo or mono input. An additional mono input (for example, talkback) can be mixed into the