For the ultimate in routing flexibility and power, nothing beats the MH-8 headphone amp from TASCAM
TASCAM's MH-8 is the ultimate headphone amplifier for studio, stage and installation. Each of the eight stereo outputs gets 250mW per side with three switchable sources available. Two stereo inputs can be shared with any of the outputs, and individual stereo direct inputs are available for each of the eight channels. A headphone out can select any one of these inputs, or mix several together. A set of foldback outputs allows you to chain other MH-8s into a system.8 stereo 1/4" headphone outputs
250mW + 250mW at 32Ω per channel
Each headphone output is switchable to input 1, input 2 and direct input source (or a combination of the three)
Master input gain controls
16 1/4" TRS balanced direct inputs
4 XLR balanced inputs (CH1 & CH2)
2 1/4" TRS balanced inputs (CH1)
2 RCA unbalanced inputs (CH2)
4 TRS balanced foldback outputs
Ground lift switch and terminal