Given that both units use an SMPS power supply I wonder how different the two units would sound from one another. To John Atkinson you cant measure AES48 compliant device's noise by shorting it to the GND you will pickup noise from the enclosure, you need to short out the signal wires or put a resistor between them.Īs a current owner of a few DIY Hypex NC400 amplifiers I see some of the measurements of this Benchmark amp looking very similar to what has been seen in the Hypex amp/smps modules in terms of low distortion figures. Web: This amp is designed to show good THD+N on the AP test you can't correlate this measurements to the other amps tests in stereophile because the amp has no gain it puts AP generator/analyser in the low distortion field if you loopback AP2 you will see that from 10-500mvRMS has 0.015-0.0004 THD+N if you add 23db gain to that line the amp that has no distorion has to have THDvsPower graph line from 0.003-0.0003 downward slope strait line from 100mW to 30Watts then flatten's out toward 100 Watt on 80kHz bandwidth, if put the analyser in 20kHz bandwidth the line will be lower but still the same shape like thisĪs is measured on a class a amp with lower distortion then AHB2 and when you crank the volume control on the pre-amp to compensate for the low gain you will amplify the noise of the DAC or Phono-pre up to levels of the other amps so low noise in the AHB2 is just red herring if you lower the designed gain of any amp the noise gets lower as well. Hampton Place, Suite 2, Syracuse, NY 13206-1633. Manufacturer: Benchmark Media Systems, Inc., 203 E.
BENCHMARK AHB2 SPECIFICATIONS SERIAL NUMBER
Serial number of unit reviewed: 14440108-0. Signal/noise (A-weighted): 132dB (stereo), 135dB (mono). Frequency response: better than 0.1Hz≢00kHz, +0/≣dB. Input sensitivity (selectable): 9.8V RMS/22dBu, 4V RMS/14.2dBu, 2V RMS/8.2dBu. Output current: 18 amps/channel, both channels driven, 18 amps shut-down threshold. Output power, bridged-mono mode: 200W into 16 ohms (26dBW), 380W into 8 ohms (25.8dBW), 480W into 6 ohms (25dBW). Front-panel controls: Power Switch, Power Indicator, Clip, Temperature, and Mute Indicators for each channel. Rear-panel controls: two 12V trigger inputs/outputs, three-position Input Sensitivity Switch, two-position Bridge Mode Switch. Outputs: 1 pair multiway binding posts, 1 pair Neutrik NL4 speaker outputs (channels 1 & 2), 1 Neutrik NL4 speaker output (for bridged-mono operation). Inputs: 1 pair balanced, line-level (XLR).
Description: Two-channel, solid-state power amplifier.
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