Mackie HM-400 Features:
Rackmount 4-channel headphone amplifier
3 outputs per channel for a total of 12 headphone outputs
Each channel contains an aux input and a balance control to mix your main and aux signals
 
Type:Headphone Amp
Input Channels:4
Output Channels:4 (3 outs per channel)
Analog Inputs:2 x 1/4" (main L/R rear), 1 x 1/4" (main front), 2 x XLR (main L/R), 4 x 1/4" (aux in)
Analog Outputs:2 x 1/4" (main L/R), 2 x XLR (main L/R)
Headphones:12 x 1/4" (8 x rear, 4 x front)
Controls per Channel:Balance, Bass, Treble, Output
Form Factor:Rackmount
Power Supply:Standard IEC AC cable
Height:1.8"
Width:19"
Depth:8.8"
Weight:8 lbs.