The RA53b is a high powered headphone amplifier with five 1/4” and
1/8” (3.5mm) headphone and earphone outs. Two RA53b units may be
linked together and mounted side-by-side in a universal rack tray for
a total of 10 outputs.

RA53b Headphone Amplifier

5: 1/4" TRS Headphone Outputs with Le...