The Benchmark HPA4 Reference Headphone/Line Amplifier with Remote Control (Silver) is a single channel headphone and line amplifier. It features a headphone output power of up to 6000 mW, and includes a touchscreen display. The device has multiple audio input and output options including 1/4" / XLR 4-Pin Balanced (Headphone) XLR / RCA (I/O), 1x 1/4" TRS Unbalanced Headphone Output, 1x XLR 4-Pin Balanced Headphone Output, 4x XLR 3-Pin Balanced Input, 2x Stereo 2RCA Unbalanced Input, 2x XLR 3-Pin Balanced Output, 1x XLR 3-Pin Balanced Output, and 1x Stereo 2RCA Unbalanced Output. It also includes 2x 1/8" / 3.5 mm TRS. The frequency response is 0.1 Hz to 500 kHz -3 dB, with a maximum input level of +28 dBu and maximum output level of line outputs: +28 dBu and headphone outputs: 11.5 Vrms (300-Ohm Load).
Line Outputs: < -133 dB (1 kHz) < -116 dB (10 kHz) Balanced Headphone Outputs: < -133 dB (1 kHz) < -115 dB (10 kHz)
Maximum Input Level
+28 dBu
Maximum Output Level
Line Outputs: +28 dBu Headphone Outputs: 11.5 Vrms (300-Ohm Load)
Noise
Line Outputs: < 1.9 µV (Unity Gain, 20 Hz to 20 kHz) Headphone Outputs: < 2.45 µV (Unity Gain, 20 Hz to 20 kHz)
Other I/O
2x 1/8" / 3.5 mm TRS 12 V Trigger (Bi-Directional)
Power Requirements
AC Input
SNR
Line Outputs: > 135 dB (Unweighted, 20 Hz to 20 kHz) > 137 dB (A-Weighted) Headphone Outputs: > 131 dB (Unweighted, 20 Hz to 20 kHz) > 135 dB (A-Weighted)
