THE ULTIMATE LINE AMPLIFIER

The HPA4 is the ultimate line amplifier for professional applications. It features balanced and unbalanced inputs and outputs. It includes four fully-balanced high-precision 256-step relay controlled gain stages. The gain range is -112 dB to +15 dB in 0.5 dB steps. The relay closures are precisely timed to provide silky-smooth volume changes. The HPA4 also includes relays for mute, balance, input selection, and -20 dB dim. The revolutionary THX-888 headphone amplifier drives a pair of headphone outputs. The HPA4 line amplifier is an excellent choice for controlling the levels to studio monitors, and power amplifiers in the most critical listening environments. No other analog-to-analog line amplifier offers higher performance!

The HPA4 Line Amplifier defines the current state of the art:

  • THD < -125 dB (0.00006%)
  • SNR > 135 dB, unweighted, 20-20 kHz
  • SNR > 137 dB, A-weighted
  • Frequency Response - 0.003 dB at 10 Hz, -0.001 dB at 20 kHz
  • - 3 dB Bandwidth exceeds 0.1 Hz to 500 kHz
  • Output Impedance 60 Ohms
  • Output Noise < 1.9 uV at Unity Gain, 20-20 kHz
  • Maximum Input and Output Level, +28 dBu
  • Crosstalk < -133 dB @ 1 kHz, -116 dB @ 10 kHz
  • Gain Range -112 to +15 dB in 0.5 dB steps

The THX-888 Headphone Amplifier also defines the state of the art:

  • THD < -125 dB (0.00006%)
  • SNR > 131 dB, unweighted, 20-20 kHz
  • SNR > 135 dB, A-weighted
  • Frequency Response - 0.003 dB at 10 Hz, -0.001 dB at 20 kHz
  • - 3 dB Bandwidth exceeds 0.1 Hz to 500 kHz
  • Output Impedance, near 0 Ohms
  • Output Noise < 2.45 uV at Unity Gain, 20-20 kHz
  • Maximum Output Power, 6 Watts into 16 Ohms
  • Maximum Output Voltage, 11.5 Vrms into 300 Ohms
  • Crosstalk < -133 dB @ 1 kHz, -115 dB @ 10 kHz (XLR4)
Benchmark HPA4 Headphone / Line Amplifier from $ 2,995.00
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