Benchmark

BNMK_500-17200-200

Benchmark HPA4 - Headphone / Line Amplifier


The Benchmark HPA4 is an elite headphone amplifier that initiates the Benchmark / THX alliance in creating one of the best-in-class headphone amp / DAC's on the market. The THX Achromatic Audio Amplifier technology found in the HPA4 reduces harmonic distortion by up to 40 dB. The HPA4 features 4 x stereo analogue inputs split over XLR and RCA connectors. It also offers 2.1 balanced monitoring via XLR, and has stereo unbalanced RCA output connectors too. Available in either a black or silver finish, and with or without a remote. 


    • Benchmark HPA4 PRODUCT FEATURES:

      The HPA4 is Benchmark's newest headphone amplifier. Benchmark Media Systems, Inc. and THX, Ltd. have partnered to introduce the Benchmark HPA4 headphone/line amplifier featuring THX Achromatic Audio Amplifier (AAA™) technology.

      THX AAA™ reduces harmonic, intermodulation, and crossover distortion by 20 to 40 dB to guarantee a realistic and fatigue-free listening experience. It accomplishes this using a patented feed-forward topology to null conventional distortion and noise mechanisms, resulting in the world's most linear amplifier. THX AAA allows the amplifier to reach its maximum output power and sound pressure level (SPL) without producing the distortion that normally accompanies increased output levels in traditional amplifiers.

      Featuring the flagship THX-888 amplifier design, the revolutionary HPA4 headphone amplifier incorporates the same THX AAA technology that Benchmark uses in the AHB2 power amplifier. The HPA4 delivers sonic perfection. Hear the music without any contamination from electronic noise or distortion. The HPA4 delivers power, audio fidelity, speed and accuracy over an utterly silent background.

      The THX-888 amplifier is driven by a Benchmark line amplifier that features relay gain control, relay input selection, and relay muting. The line amplifier incorporates the finest gold-contact relays available. The gain control has 256 steps in 0.5 dB increments. It also features a balance control. Relay closures are precisely timed to deliver silky-smooth volume changes. No other relay gain control offers this level of precision and performance. The HPA4 includes 4 independent 256-step attenuators: two for the L&R headphone outputs, and two for the L&R line outputs. To make this all happen, the HPA4 includes a total of 64 precision relays.

      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 TECHNICAL SPECIFICATIONS:

      * using balanced inputs at +24 dBu

      THX-888™ Headphone Output:
      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 Current, 1.5 A
      Maximum Output Voltage, 11.5 Vrms into 300 Ohms
      Crosstalk < -133 dB @ 1 kHz, -115 dB @ 10 kHz (XLR4)

      Balanced Line Outputs:
      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 Voltage, 20 Vrms (+28 dBu)
      Crosstalk < -133 dB @ 1 kHz, -116 dB @ 10 kHz

      Dimensions:
      8.65" W x 3.88" H x 8.33" D - Including Feet
      8.65" W x 3.47" H x 8.33" D - Excluding Feet

      Weight:
      8.0 lbs., 12 lbs. shipping

      Power:
      18W Typical Input Power
      35W Maximum Input power
      0.33 W Standby Power (when off)
      Internal Universal Power Supply

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