H1
H1 Overview
The H1 is an ultra-high resolution stereo headphone amplifier with current boosted outputs that will drive headphones with impedances down to 60 ohm.
Inside the H1 is Benchmark's signature headphone amplifier module, the HPA-2™. The sonic purity of the HPA-2™ fulfills even the most demanding headphone applications. The spectacularly clean performance offers true state-of-the-art listening with today's ultra-high performance headphones.
Specs
| Input | Stereo 200 kO Balanced Inputs with over-voltage protection |
| Input Clip | +26.5 dBu with ±15 volt supplies |
| Output | Stereo, for use with 1/4" Tip/Ring/Sleeve plugs only, short-circuit protected |
| Output Impedance | 0 O |
| Load Z | 60 O or greater |
| Output Clip | Dependant upon power voltage and load [+20 dBu @ ±15V and 60 O load] |
| Load Impedance | 30 O or higher |
| Output Level | Up to +20 dBu into 60 O [dependent upon power source] |
| Output Control | Dual log taper response |
| Gain Range | Off to +20 dB |
| Bandwidth | 0.1 Hz to 300 kHz minimum |
| THD+N | 0.0003% typical at headphone inputs - under load! |
| Noise Floor | Better than -75 dBu at maximum gain |
| Power | (Bipolar) ± 9 to ± 18 volts, bridge-rectified, maximum peak current needed = 1.1 Amp at maximum peak output into 30 O |
| Peak Output | 7.5 watts [±18 volt supplies. 30 O load] |
| Max Avg Output | 1.35 watts [-8 dB peak to average ratio] |
| Dimensions | 5.5” (139.7mm) Deep 1.5” (381.1mm) High 5.5” (139.7mm) Wide. |
| Weight | 1.17lb |
For more specifications, please download the H1 Product Manual.
Power Supply Options
PS-1
The PS-1, a ±16 VDC, 300 mA wall mount power supply, is included with every H1.
By physically separating the power supply from the audio electronics, EMI (Electromagnetic Interference) generated from the transformer in-rush currents at the filter capacitors is prevented from contaminating the audio signal.
PS-12
The PS-12 (pictured below) is a ±15 VDC, 700 mA, 110/220 Volt power supply that powers up to two H1s
Power output is provided using easy-to-obtain RJ11 modular connectors. This makes creating an extension simple and inexpensive. The center two pins on the RJ11 are ground, thereby protecting against a mistaken telephone plug-in.
A 1 RU Rack-Mount panel accomodates 3 H1s or PS-12s
Rear view:
Rack-Mount Panel:
