Format-A Stereo Headphone Amplifier-Stainless Steel (Compatible with Guest Room Audio System)

The RDL DS-HA1A is a stainless steel Format-A stereo headphone amplifier designed for integration with guest-room audio systems and other RDL twisted-pair installations. It combines a user-accessible level control with a standard mini-jack headphone output in a Decora®-style, all-steel panel and rear enclosure. The module mounts in a wall or cabinet and receives its audio signal and operating power through an RJ45 connection from a compatible Format-A sender.

Ideal Use Cases

This model is suited to guest-room audio systems that require a conveniently located stereo headphone connection. Its wall- or cabinet-mounting design allows the listening control and mini-jack output to be positioned where users can reach them while the supporting audio distribution equipment remains elsewhere in the installation.

The DS-HA1A also fits RDL TP Format-A systems that need multiple modules connected along a twisted-pair cable run. Its RJ45 loop-through output supports connection of additional Format-A modules without eliminating access to the signal at this location.

Why Choose This Model

The DS-HA1A brings the essential headphone functions together in one installation-focused module: stereo amplification, user level adjustment, a standard mini-jack output, and Format-A signal distribution. Its stainless steel finish matches the specified version, while the Decora® design supports a clean wall-plate presentation.

The enclosure is constructed with an all-steel panel and rear housing. An automatically resetting fuse provides built-in protection without requiring replacement of a conventional fuse after it resets. Power is supplied by the connected RDL twisted-pair Format-A sender, so the module does not use a separate local power connector.

Installation and Integration

The input is RDL TP Format-A through an RJ45 connection. Two Format-A signal pairs, B and C, are used. Audio, power, and downstream signal continuity are handled through the RJ45-based connections: the input carries the Format-A signal and power from the sender, while the Format-A output provides RJ45 loop-through connectivity for additional modules.

The module requires 24 Vdc at 30 mA, with power provided by the Format-A sender. RDL lists the PS-24AS as the recommended power supply for the USA and the PS-24AX for international use. The product measures 1.55 inches deep, 1.72 inches wide, and 4.11 inches high, giving installers exact dimensions for wall or cabinet planning.

Performance Highlights

The stereo output is rated at 25 mW per channel into 100 ohms. Frequency response extends from 10 Hz to 40 kHz within ±1 dB when measured into 100 ohms. THD+N is specified at less than 0.01% at 1 kHz and 10 mW, while noise is rated below -90 dB at maximum gain.

Channel separation is represented by crosstalk specifications of less than -85 dB at 1 kHz and less than -70 dB from 20 Hz to 20 kHz. Together, these published figures define the amplifier’s operating performance under the stated measurement conditions and make it straightforward to compare the DS-HA1A with the requirements of a planned Format-A installation.

What Makes It Different

Unlike a freestanding headphone amplifier, the DS-HA1A is configured as a wall- or cabinet-mounted endpoint for an RDL Format-A system. The same installation combines user level control, stereo headphone output, twisted-pair signal input, sender-provided power, and an RJ45 loop-through connection.

The stainless steel Decora®-style panel distinguishes this version from the available white and black finishes. Its all-steel panel and rear enclosure, standard mini-jack output, and automatically resetting fuse are specified as part of the module rather than as external accessories.

Final Assessment

The RDL DS-HA1A is a focused choice for adding a user-controlled stereo headphone point to a compatible guest-room or RDL TP Format-A audio system. It offers defined audio performance, compact wall or cabinet mounting, sender-supplied 24 Vdc power, and RJ45 loop-through expansion. For installations already built around a Format-A sender and twisted-pair cabling, it provides the required headphone amplification and connection functions in a stainless steel Decora®-style module.