H1
HPA2™ Module
Rear Panel View
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 Ω |
| Load Z |
60 Ω 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
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.
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
(click images to enlarge)
Rear view:
Rack-Mount Panel:
