D/DS-SH1/M Stereophonic Headphone Amplifier is a Decora-compatible stereophonic headphone amplifier from Radio Design Labs. It has long-life VCA stereo level control, balanced or unbalanced inputs, switch-selectable input sensitivity, switch-selectable mono (left) or stereo operation, and can drive high or low impedance headsets.
The document describes the RDL D/DS-SH1/M series of Decora-compatible stereophonic headphone amplifiers. These units are designed to drive headphones of any impedance from consumer or professional audio sources in applications such as language translation, museums, and music stores.
Available in panel-mount (D-SH1) and wall-mount (DS-SH1) configurations with white or brushed stainless steel enclosures, the modules feature balanced or unbalanced inputs, switch-selectable sensitivity, and mono/stereo operation. They deliver up to 50 mW into low impedance headphones via a standard 6.3 mm jack or 10 mW at 12VDC.
| Maximum Input Level (Low Sensitivity) | +21 dBu balanced; +3 dBV unbalanced |
|---|---|
| Output Signal (normal rated) | 50 mW into 100 Q |
| THD+N | < 0.5% @ 1 kHz |
| Frequency Response | 30 Hz to 20 kHz (+/- 2 dB) |
| Noise | < -70 dB below normal operating level |
| Gain (High Sensitivity) | 18.5 dB maximum |
| CMRR | > 60 dB (50 to 120 Hz) |
The module operates from a 24 Vdc ground-referenced power supply, or can run on 12 Vdc with reduced headroom.
The standard model uses a 6.3 mm (1/4 inch) headphone jack, while the mini version uses a 3.5 mm jack.
Yes, the output amplifiers are capable of driving both high and low impedance headsets.