Nady HPA-8 Eight Channel Headphone Amplifier - Eight stereo headphone channels, single rack space, level adjustment and a 1/4&rdquo; headphone output per channel 8 channel headphone amplifier for totally independent highpower (over 100mW/channel) distribution with multiple signal distribution options for monitoring flexibility in an all-metal chassis and single rack mount design 6 balanced, selectable stereo/mono line-level 1/4" TRS inputs with unique routing capacity allows you to distribute one input signal to all outputs or group the outputs from several inputs for monitoring flexibility "Each output channel features an independent rotary volume control for variable adjustment of the 1/4"" TRS stereo microphone/line level outputs" Rugged 1U construction with high-tolerance components and low-noise amps for clear, transparent audio with maximum headroom Shielded internal dual regulated power supply with (-115V/60Hz or -230V/50Hz) selector switch and fused IEC power cord connector