The unit features four summing mono audio inputs which are presented to both channels of the headset. The microphone signal is also summed with the audio inputs, and this sidetone level is internally adjustable. Two microphone audio outputs carry the amplified microphone signal only. All inputs and outputs are balanced. The HDST-1 provides a great deal of flexibility when connecting a headset to any system.
A remote connector allows the microphone to be muted, and the entire headset to be turned on and off. A tally is also provided for headset on.
The microphone preamplifier has adjustable gain, and includes a compressor with adjustable threshold and ratio controls.
| Power Requirements | 115 VAC, 60 Hz or 230 VAC, 50 Hz; 5 W |
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| Headset Connector | XLR (male, specify no. of pins when ordering) |
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| Headphone Impedance | 200 ohms to 2 kohms |
| Headphone Output Level | +18 dBu maximum |
| Microphone Input Signal Level | 0 dBu maximum |
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| Microphone Gain Range | 25 to 64 dB |
| Microphone Equivalent Input Noise (EIN) | -121 dB @ 60 dB gain |
| Microphone Compressor Ratio Range | 1.5:1 to 5:1 (approx.) |
| Audio Input/Output Levels | +24 dBu maximum |
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| Audio Input/Output Connectors | Screw clamp terminal blocks |
| Number of Headphone Audio Inputs | 4 mono, summing |
| Audio Input Impedance | 40 kohms, balanced |
| Number of Microphone Audio Outputs | 2, each with 2 parallel connectors |
| Frequency Response | +0/-0.2 dB, 20 Hz to 20 kHz |
| HDST-1 | 8.1 W x 1.9 H x 5.1 D |
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| HDST-1 | Stand alone Table Top Version |
| HDST-1/R1 | 1 Unit Rack Mounted in 1 RU Frame. Unit takes 1/2 of the rack frame |
| HDST-1/R2 | 2 Units Rack Mounted in 1 RU Frame |
| HDST-1/A | Assembly unit only. Ordered for existing Frames |
| HDST-1/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 |
