A specially designed output circuit will drive most headphones to maximum levels, regardless of headphone impedance. 600 ohm headsets are driven to levels comparable to those obtained using a 20 watt/channel power amplifier.
Input connections are made via balanced 1/4" TRS input connectors, which will also accept unbalanced inputs. Input levels are internally adjustable for -10 dBV/0 dBm/+8 dBm. A mono input may be connected using the right channel input only, and will be normalled to both channels.
Independent front panel gain controls permit comfortable listening levels to be adjusted for each headset.
| Power Requirements | 115 VAC, 60 Hz or 230 VAC, 50 Hz; 10 W |
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| Input Impedance | 20 kohms unbalanced, 40 kohms balanced |
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| Input Signal Level | -10 dBV/0 dBm/+8 dBm nominal (via jumper) |
| Maximum Input Level | +23 dBm |
| Input Connectors | 1/4" TRS x 2 |
| Headphone Impedance | 8 ohms to 2 kohms |
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| Output Level | 100 mW nominal, 350 mW max., 8 ohms to 600 ohms |
| Output Connectors | 1/4" TRS x 2 |
| Frequency Response | 20 Hz to 30 kHz +/-0.05 dB |
| T. H. D. + Noise | Less than 0.03%, 20 Hz to 30 kHz, nominal output |
| Hum and Noise | -84 dBm, 20 Hz to 30 kHz |
| Common Mode Rejection | -80 dB @ 60 Hz |
| HA-2B | 8.1 W x 1.9 H x 5.1 D |
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| HA-2B | Stand alone Table Top Version |
| HA-2B/R1 | 1 Unit Rack Mounted in 1 RU Frame. Unit takes 1/2 of the rack frame |
| HA-2B/R2 | 2 Units Rack Mounted in 1 RU Frame |
| HA-2B/A | Assembly unit only. Ordered for existing Frames |
| HA-2B/M | Manual |
| PH-3/FR | Phase 3 Rack Frame with no Products Installed |
| PH-3/BF | Phase 3 Blank Front Panel plate |
| PH-3/BR | Phase 3 Blank Rear Panel Plate |
| PH-3/DB | Phase 3 Under the Desk Mounting Bracket |
