Line-Level Receiver-8 Twisted Pair Format-A Input Sections-24 Audio Channels-Balanced Line Level Outputs on Detachable Terminal Blocks

The RDL SF-TPR24A is a line-level Format-A receiver built around eight separate three-pair receiver sections. Each section accepts an RDL Format-A input through RJ45 and provides audio outputs for pairs A, B, and C, producing up to 24 balanced channels in one unit. Every section supplies three nominal +4 dBu outputs on detachable terminal blocks. The design also distributes local power to modules connected to its inputs, provides automatic-resetting fuse protection for wiring faults, and gives each RJ45 section a green power-validity indicator.

Ideal Use Cases

This model is suited to Format-A systems that need to receive multiple line-level audio channels at a central location. Its eight inputs and three outputs per section support installations in which signal pairs A, B, and C must be recovered individually. The 24 balanced outputs accommodate downstream equipment requiring balanced line-level feeds through detachable terminal blocks.

The SF-TPR24A is also appropriate when receiver-side power distribution and visible status indication are important. Local power feeds all modules connected to the INPUTs, while one green LED per RJ45 indicates the validity of module remote power. These capabilities support organized operation across all eight receiver sections.

Why Choose This Model

The SF-TPR24A combines high channel density with a consistent connection format. Eight RJ45 Format-A inputs receive as many as 24 audio channels, and every three-pair section provides a dedicated output for each of its A, B, and C signal pairs. All 24 outputs are 150-ohm balanced connections presented on detachable terminal blocks.

Output level is specified at +4 dBu balanced nominal with a maximum level of +22 dBu. More than 18 dB of headroom is available above +4 dBu. Studio-quality precision active balanced circuitry supports the unit’s role in line-level signal distribution, while wiring-fault protection is provided by an automatic-resetting fuse.

Installation and Integration

Each of the eight Format-A inputs uses an RJ45 connection. The balanced outputs are provided on detachable terminal blocks, allowing all three signal pairs from each receiver section to be connected separately. Local 24 Vdc power can be connected through either the power jack or the detachable terminal block.

The power requirement is 24 Vdc at 360 mA plus connected loads, with a maximum of 1.6 A. Recommended power-supply options listed for the unit are the PS-24V3A and PS-24KS for the USA, along with the PS-24V3 and PS-24KX international versions. The chassis measures 8.74 inches wide, 1.68 inches high, and 5.78 inches deep. Its specified ambient operating range is 0° C to 55° C.

Performance Highlights

The receiver has a frequency response of 10 Hz to 50 kHz within ±0.1 dB. THD+N is specified at less than 0.005%, and crosstalk is below the noise floor from 20 Hz to 20 kHz with a +4 dBu input. The listed noise performance is less than 90 dB below +4 dBu.

Common-mode rejection is greater than 80 dB from 50 Hz to 150 Hz. Combined with the nominal +4 dBu balanced output level, +22 dBu maximum output, and greater than 18 dB of headroom, these specifications define the unit’s line-level operating capability across all eight receiver sections.

What Makes It Different

The defining feature of the SF-TPR24A is its repeated three-pair architecture. Every one of its eight receiver sections handles all three Format-A signal pairs and exposes three corresponding balanced outputs. This produces 24 independently available outputs while preserving the A, B, and C organization at each input.

The same unit also supplies local power to connected input modules, monitors remote-power validity with eight section-specific green LEDs, and protects against wiring faults with an automatic-resetting fuse. Power can be introduced through either of two connection types, supporting terminal-block or dc power-jack integration.

Final Assessment

The RDL SF-TPR24A is a purpose-built choice for receiving up to 24 RDL Format-A audio channels through eight RJ45 input sections. It combines three balanced +4 dBu outputs per section, detachable output terminals, local power distribution, per-section power indication, and specified precision audio performance. For systems organized around Format-A pairs A, B, and C, it provides a clearly structured receiver and output interface in a single chassis.