The Benchmark HPA4 Rackmount Reference Headphone/Line Amplifier with Remote Control is a single channel headphone and line amplifier designed for professional use. It features a headphone output power of up to 6000 mW, with 6000 mW into 16 Ohms (Max). The device includes 1/4" / XLR 4-Pin Balanced (Headphone) XLR / RCA (I/O) audio I/O. It requires AC input power and has a rackmount form factor. The amplifier also includes a touchscreen display, multiple analog and digital audio inputs and outputs, and other I/O such as 2x 1/8" / 3.5 mm TRS and 12 V Trigger (Bi-Directional). The frequency response ranges from 0.1 Hz to 500 kHz -3 dB and 10 Hz to 20 kHz -0.003 dB. The maximum input level is +28 dBu, with line outputs at +28 dBu and headphone outputs at 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)
