Format-A Two-Pair Audio Sender (Compatible with Guest Room Audio System)

The RDL FP-TPS4A is an ultra-compact, all-metal Format-A sender designed to distribute high-quality audio through two RJ45 outputs. It accepts left and right audio from a fixed-level unbalanced source, such as a television, or a balanced mono signal from an amplified source. The sender uses Format-A signal pairs B and C and can also distribute power to connected receivers.

Ideal Use Cases

This model is suited to guest room audio systems and other installations that need to carry fixed-level audio from a source to compatible Format-A receivers. Its two input configurations support several practical signal paths without requiring the source to provide a single specific connection type.

• Sending left and right audio channels from a television’s fixed audio output
• Distributing unbalanced stereo audio from a fixed-level source
• Accepting a balanced mono feed from an amplifier
• Feeding two RDL TP Format-A outputs through RJ45 connections

Why Choose This Model

The FP-TPS4A combines flexible source connections, two Format-A outputs, and receiver power distribution in a compact enclosure. Its three inputs consist of two 20 kΩ unbalanced inputs for left and right audio and one 100 kΩ balanced input for a mono amplified signal. Unbalanced sources connect through a phono jack, while the balanced input uses a mini-jack.

The supported unbalanced input level is 10 dBV. For the balanced amplified input, the supported range is 1 W into 8 ohms through 10 W into 8 ohms, with 2 W nominal. This allows the sender to work with either a fixed-level stereo source or an appropriate amplified mono source while maintaining clearly defined input requirements.

Installation and Integration

Integration begins by selecting the connection that matches the source. Connect the fixed-level unbalanced source through the phono input for left and right audio, or use the balanced mini-jack input for a compatible mono amplifier signal. The distributed RDL TP Format-A signal is available from two RJ45 outputs, using signal pairs B and C.

Power connects through a locking power jack. The unit requires 24 Vdc at 30 mA plus the current required by connected loads, with a maximum load current of 500 mA. Recommended power supplies are the PS-24AS for the USA and PS-24AX for international use. An automatically resetting fuse is provided for the output voltage, and the power indicator shows when the input and outputs are active.

Performance Highlights

The FP-TPS4A provides a frequency response of 10 Hz to 50 kHz within ±0.1 dB. THD+N is less than 0.05%, while noise below +4 dBu is less than -85 dB. Headroom above +4 dBu exceeds 18 dB.

Channel separation is supported by crosstalk performance of less than -85 dB from 10 Hz to 10 kHz and less than -80 dB from 10 kHz to 20 kHz. These documented performance figures make it possible to evaluate the sender against the signal-quality requirements of a planned Format-A installation.

What Makes It Different

Unlike a sender limited to one source format, the FP-TPS4A accommodates both unbalanced left-and-right audio and a balanced mono amplified input. It delivers the selected audio through two RJ45 Format-A outputs while distributing power to connected receivers. The automatically resetting output-voltage fuse and locking power connection further support permanent system integration.

Its compact all-metal enclosure measures 4.15 inches long, 3.25 inches wide, and 1.68 inches high, or 10.5 by 8.6 by 4.27 centimeters. This small footprint helps the sender fit into installations where available equipment space is limited.

Final Assessment

The RDL FP-TPS4A is a focused solution for distributing television fixed-output audio, fixed-level stereo audio, or a compatible amplified mono signal within an RDL TP Format-A system. Two RJ45 outputs, power distribution for connected receivers, defined audio performance, and ultra-compact metal construction make it a capable central sender for compatible guest room audio applications.