LX8™ Using & Applications

The following page describes how to use the LX8. For more information, feel free to download the full manual by clicking on the icon at left.


The LX8 is an eight channel balanced line level splitter that's designed to provide both splitting capabilities and signal isolation in order to eliminate hum and buzz caused by ground loops and stray DC currents. The use of high density D-Sub cables enables the user to connect up to 8 inputs and send out three sets of outputs, for a total of 24 output connections. The LX8 is also designed to withstand extreme dynamics – upwards to +26dB - without introducing audible distortion. This makes it ideal for splitting and isolating just about any type of signal you can imagine.

Making connections

Before connecting, ensure audio system levels are down or equipment is turned off. This helps eliminate plug-in and turn-on transients that can damage more sensitive components such as tweeters.

Connecting to and from the LX8 can be done by using one of three connector types. The inputs and outputs are wired in parallel, making it easy to route signals as needed.

  1. Front panel XLR input connectors
    These connections offer quick access to the LX8 via the outputs of a console or recording interface. The XLRs are wired to the AES standard with pin-1 ground, pin-2 hot (+), and pin-3 cold (-).
  2. Rear panel 25 pin D-Subs
    The LX8 is equipped with four (4) sets of D-Subs. These follow the standard employed by Tascam and ProTools making it easy to find breakout cables in most music stores and pro-audio shops.
  3. Phoenix screw-down terminals
    These are intended for use in permanent installations. One simply orders the optional cable mount connectors, screws down the wires, and then connects to the LX8.

As the Radial LX8 is completely passive, there are no power connectors required. You simply plug in and the LX8 automatically springs to life.

Using the LX8 as a multi-channel line isolator

When using a PA system, hum and buzz can find its way into the audio signal path. This can be due to stray DC currents and noise traveling between the various ground points. Inserting the LX8 in between a source and destination will often eliminate the problem by isolating the two pieces of equipment. Lifting the ground can be of further benefit.

Using the LX8 as a 2-way splitter

The most common use for the LX8 is to split a balanced line level signal to feed two audio systems. When used this way, the first system is fed a direct signal while the second system is typically fed via the isolated output. The LX8 is equipped with ground lift switches on the front panel to help eliminate hum and buzz caused by ground loops.

Using the LX8 as a 3-way splitter

When using the LX8 as a 3-way splitter, the incoming signal is then sent out via the direct output, the isolated output and the auxiliary output with ground lift switch. It is always a good idea to allocate the isolated output to the most critical audio path as transformer isolation is the most effective means of eliminating hum and buzz caused by ground loops.