Radial Catapult TX4L 4-Channel Cat 5 Line-Level Isolator / Splitter Snake

Radial Catapult TX4L: A Four-Channel Line Splitter and Isolator That Rides on Cat 5

The Radial Catapult TX4L is a passive, four-channel line-level splitter and isolator that takes four balanced line signals, isolates them with transformers, and transmits them over a single shielded Cat 5 or Cat 6 cable. It combines two jobs in one compact steel box: it sends four channels down featherweight network cable in place of a bulky multicore, and it uses line-level isolation transformers to break the ground loops that put hum and buzz into a split feed. For the engineer feeding playback tracks or console outputs to amp racks and monitor zones, the TX4L delivers clean, quiet, isolated audio wherever it needs to land.

Why Line-Level Signals Need Transformer Isolation

Whenever you split one line output to two or more destinations, you tie their grounds together, and gear referenced to different grounds sends stray current down the audio cable, which you hear as 60-cycle hum and buzz. The TX4L breaks that path with a line-level isolation transformer on each channel: the transformer passes the audio magnetically while physically separating the two grounds, so no loop current can flow. The result is four splits that stay dead quiet even when they feed amplifiers scattered across a large stage.

Analog Audio Over a Single Cat 5 Cable

A Cat 5 cable carries four twisted pairs, and each balanced channel needs exactly one pair, so a single Cat 5 run moves all four of the TX4L's channels at once. The audio never leaves the analog domain, meaning there is no sampling, no encoding, and no latency, just balanced line-level signal traveling over inexpensive, widely available network cable. That lets you split line audio between three different destinations, or route it through a building's existing Cat 5 wiring from one room to another.

Direct Isolated Outputs Plus a Cat 5 Send

The TX4L gives you four XLR-F inputs and four transformer-isolated XLR-M outputs on the box itself, plus an RJ45 jack that carries the same four channels over Cat 5. That combination lets one unit feed a local amp rack from its XLR outputs while simultaneously sending the four channels across the venue on a single Ethernet cable to another Catapult module. Each channel also carries a ground-lift switch, so you can chase down and silence any remaining hum one line at a time.

Passive, Rugged, and Ready for the Road

The TX4L is entirely passive, drawing its performance from custom transformers rather than any power supply, so there is nothing to plug in and nothing to fail. It is housed in a 14-gauge steel chassis and outer shell built to take the daily punishment of touring and install work, with a locking, metal-shelled RJ45 connector that resists accidental disconnection. This is a tool you throw in a case, patch once, and trust to keep working for years.

Where the TX4L Earns Its Keep

On stage, the TX4L splits playback tracks and console outputs to multiple amplifier racks without a trace of ground-loop hum. In corporate and worship AV, it carries isolated line feeds between distant rooms over existing network cable. In a fixed install, it acts as a clean four-channel line isolator anywhere two systems must connect without sharing a noisy ground. Because it is part of the modular Catapult family, it pairs with any Catapult receive module to shape a snake around the job.

Who the Catapult TX4L Is For

The Catapult TX4L is for the front-of-house or systems engineer splitting line-level feeds to amp racks and monitor zones who cannot tolerate hum; for the AV integrator routing isolated line audio between rooms over Cat 5; and for the playback tech who needs clean, transformer-isolated splits of backing tracks. If you send line-level audio to more than one place and need it silent and ground-loop-free, the TX4L is the isolating transmitter to reach for.