Stereo Headphone Amplifier-Decora panel with user level control-Black

Ideal Use Cases

The RDL DB-SH1 is a black, panel-mounted stereo headphone amplifier for installations that require a convenient listening connection with local user level control. Its Decora mounting format supports wall-mounted and panel-mounted applications without requiring a separate tabletop amplifier. The unit accepts balanced or unbalanced sources and can drive high- or low-impedance headsets, making it suitable where headset types or source configurations may vary. Switch-selectable mono and stereo operation also allows the amplifier to accommodate either a stereo program or a mono signal derived from the left input.

Why Choose This Model

The DB-SH1 combines amplification, source compatibility, channel-mode selection, and user adjustment in one mounted control point. Its integral long-life VCA stereo level control is adjustable directly from the front panel. Two 10 kΩ balanced or unbalanced bridging inputs simplify connection to different audio systems. Switch-selectable input sensitivity provides separate operating ranges for professional and lower-level sources: the low-sensitivity setting has a +4 dBu nominal input level, while the high-sensitivity setting has a -15 dBV nominal input level.

The corresponding maximum input levels are +21 dBu in low-sensitivity mode and +3 dBu in high-sensitivity mode. These selectable ranges make the input configuration explicit during installation and help match the amplifier to the connected source.

Installation and Integration

Decora mounting compatibility gives installers a practical way to place headphone amplification at the point of use. The DB-SH1 can be mounted in a wall or panel, with its user-adjustable level control remaining accessible on the front. Balanced or unbalanced input support reduces dependence on a single wiring format, while the 10 kΩ bridging inputs provide two-channel connectivity.

A selector configures the amplifier for stereo operation or mono operation using the left input. Power requires a ground-referenced 24 Vdc supply at 50 mA. The recommended supply is the PS-24AS for the USA or PS-24AX for international use; the power supply is not included. The specified ambient operating range is 0°C to 55°C. Front and rear panel diagrams and engineering functional-block CAD files are identified as available in American DXF format.

Performance Highlights

The DB-SH1 has a frequency response of 30 Hz to 20 kHz within ±2 dB. Its normal rated output is 10 mW into 100 Ω, increasing to a maximum output of 50 mW into 100 Ω. THD+N is specified at less than 0.5% at 1 kHz, and noise is less than -70 dB below the normal operating level.

Maximum gain depends on the selected sensitivity. In high-input-sensitivity mode, the front-panel user control provides up to 18.5 dB of gain. In low-input-sensitivity mode, maximum gain is unity. Common-mode rejection is greater than 60 dB from 50 to 120 Hz. Crosstalk is specified as below the noise floor from 20 Hz to 20 kHz, supporting separation across the amplifier’s stated audio-frequency range.

What Makes It Different

This model places a complete stereo headphone listening interface into a Decora-mounted black panel. Rather than limiting installation to one source level or wiring method, it combines balanced or unbalanced inputs with switch-selectable sensitivity. The selectable mono-left or stereo mode adds another configuration option without changing the mounted interface. Its front-panel VCA stereo level control gives the listener direct adjustment, while compatibility with high- and low-impedance headsets addresses a broader range of connected headphones.

Final Assessment

The RDL DB-SH1 is a focused solution for wall- or panel-mounted headphone amplification. Its defining capabilities are the Decora mounting format, black finish, two balanced or unbalanced bridging inputs, selectable input sensitivity, mono or stereo operation, and front-panel stereo level control. With documented output, gain, noise, distortion, frequency-response, and power specifications, it provides installers with clearly defined parameters for integrating a user-controlled headphone connection.