JX-42™ Using & Applications

The following page is a quick guide that describes how to use the Radial JX-42 in a typical concert setting. For more details, please click the icon at left to download the complete manual.

Making connections

As always, before making any electrical or audio connections, ensure all volume levels are turned down or systems turned off. This prevents turn-on or connection transients from damaging more sensitive components such as tweeters. When testing, start by connecting one guitar and one amp without any pedals. This keeps things simple and avoids lengthily trouble shooting.

Connect your guitar into the JX-42 input-1 and the output-A from the JX-42 to your guitar amp. Check to make sure the power supply is properly connected. One of the front panel LEDs will illuminate to let you know if you are good to go. Make sure all of the DRAG / TRIM switches are in the out (DRAG) position and potentiometers turned fully clockwise (5 o'clock). Make sure input-1 is active and output A is on. Turn on your amp and slowly increase the volume.

Use a hex driver to loosen the cable lock.
Pass the cable through and re-tighten.

Once satisfied, add a second guitar by connecting it to input-2. Toggle between them using the front panel selector switches. You can now add a second amp by connecting it from output-B. Use the front panel selector switch to toggle between your amps.

Adjusting the Drag Control

Drag control is a load correction circuit that essentially replicates the tone and feel as if connected to a tube amp with a regular guitar cable. This fixes the problem associated with buffers whereby many do not sound natural. By loading a magnetic pickup properly, you will immediately notice the tone will warm up and sound less harsh. Drag has no effect on instruments that have built-in preamps (buffers) such as an active bass or keyboard. Start by setting the Drag control to 12 o'clock. As you turn the control clockwise, it will sound brighter. Adjust to suit.

Adjusting the Trim Control

The DRAG control can also be assigned as a TRIM control by simply having the switch on the outward position. This resistive control is designed to attenuate the input of a loud instrument (example: wireless receiver) so that it will match the output of a lower level instrument such as a passive guitar (Les Paul or Jazz Bass). To set the trim, make sure the selector switch is pushed outward and then set the potentiometer fully clockwise to 5 o'clock. Once all of the instruments are connected, compare them. For those that are loudest, simply reduce the level to suit.

Switching amps

The JX-42 is able to switch between two amps, designated as A or B. Output B is isolated in order to prevent hum and buzz caused by ground loops. You can switch the amps using a front panel switch or by adding the optional JR2 footswitch (part no R800 2090 00). This two 'button' remote lets you select between the two AB amp outputs or mute the JX-42 using the 'always on' tuner out. The JR2 is powered by the JX-42 via the balanced cable and is equipped with LED indicators for output status. This is connected using a ¼" TRS jack at the JX-42 end and a choice of either ¼" TRS or XLR-female at the JR2 end. You can also remotely switch the instrument inputs using the optional JR5 footswitch (part no R800 6600 00). This has 5 'radio-style' buttons, four of which are used to select between guitars. As soon as you select an input, the previous one will be turned off. This employs a standard 3-pin XLR cable.


You may also special order a rack mount kit (part no R800 9420 10) for the JX-42 that lets yo mount one or two JX-42s into a single 19" rack space. This is particularly handy for touring musicians that need to have their switcher nearby their amps or for technicians that require strategically positioned amp setups.

Typical setups

  • 4 electric guitars and 2 amps
  • 3 electric bases and an upright with two amps
  • 2 wireless guitars, 1 acoustic and 1 amp
  • 4 acoustic instruments