Line-Level Sender-8 Twisted Pair Format-A Output Sections-24 Audio Channels-Balanced Line Level Inputs on Detachable Terminal Blocks

The RDL SF-TPS24A is a line-level sender organized as eight separate three-pair Format-A sections. Each section accepts three +4 dBu balanced audio inputs, placing them on Format-A pairs A, B, and C for a total capacity of up to 24 channels. Inputs use detachable terminal blocks, while each Format-A output uses an RJ45 connection. The design combines high channel capacity with section-level power indication, local powering for connected output modules, and precision active balanced circuitry.

Ideal Use Cases

The SF-TPS24A is suited to audio systems that need to send multiple balanced line-level signals through RDL twisted-pair Format-A connections. Its eight independent sender sections accommodate applications ranging from a few three-channel groups to a full complement of 24 audio channels. Because every section assigns its three inputs directly to pairs A, B, and C, the unit is especially useful when channel organization must remain consistent across multiple Format-A outputs. The +4 dBu balanced input level supports professional line-level sources, while the specified +22 dBu maximum input level provides substantial input capacity.

Why Choose This Model

A primary advantage of the SF-TPS24A is its combination of eight sender sections in one unit. Each section provides three 20 kΩ balanced inputs and uses all three available Format-A signal pairs. Detachable terminal blocks provide the balanced input connections, and RJ45 connectors provide the Format-A outputs. A green LED for each section indicates the validity of remote module power, giving eight clearly defined power indicators. Local power also feeds every module connected to the outputs. Wiring fault protection is provided by an automatic-resetting fuse, adding protection without requiring a conventional fuse replacement after a qualifying wiring fault is cleared.

Installation and Integration

Installation centers on clearly grouped connections. Three balanced audio inputs are wired to the detachable terminal block for each sender section. Those inputs feed pairs A, B, and C at the corresponding RDL TP Format-A RJ45 output. Local 24 Vdc power can be connected through either the power jack or a detachable terminal block, allowing the installer to select the available connection method. The listed power requirement is 24 Vdc at 440 mA per board, plus the loads of connected modules, with a maximum of 1.6 A. Recommended power supplies listed in the source data include the PS-24V3A for the USA and PS-24V3 for international use, as well as the PS-24KS for the USA and PS-24KX for international use. The unit measures 8.74 inches wide, 1.68 inches high, and 5.78 inches deep. Its specified ambient operating range is 0 degrees C to 50 degrees C.

Performance Highlights

The SF-TPS24A uses studio-quality precision active balanced circuitry and has a specified frequency response of 10 Hz to 50 kHz within ±0.1 dB. THD+N is specified at less than 0.005 percent. Noise below +4 dBu is specified at less than 90 dB, while crosstalk is specified at less than 85 dB from 20 Hz to 20 kHz. The unit provides greater than 18 dB of headroom above +4 dBu. Common-mode rejection ratio is greater than 60 dB from 50 Hz to 150 Hz. Together, these published specifications define the signal performance available across its 24 balanced inputs and eight Format-A output sections.

What Makes It Different

The defining feature is the repeated three-channel architecture: eight separate sections, three balanced inputs per section, and all three Format-A pairs used at every output. This provides a direct relationship between each input group and its corresponding RJ45 connection. Power distribution is integrated into the same architecture, allowing local power to feed modules attached to the outputs. One green LED per RJ45 section verifies valid remote power, while automatic-resetting fuse protection addresses wiring faults. The result is a tightly organized Format-A sender built around consistent channel grouping, visible power status, and two local power-connection options.

Final Assessment

The RDL SF-TPS24A is a focused solution for sending up to 24 +4 dBu balanced audio channels through eight three-pair Format-A outputs. It combines detachable terminal-block inputs, RJ45 outputs, local power distribution, per-section green power indicators, and automatic-resetting wiring protection. Its 10 Hz to 50 kHz frequency response, low specified THD+N, and greater than 18 dB of headroom support applications that require documented line-level performance across a substantial number of channels.