Radial Twinline User Guide
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Using The Twinline™

This page discusses the Twinline's basic use and various setups that you can employ. For complete details, feel free to download the Twinline manual by clicking the image on the left.

The best way to approach the Twinline is to consider your amp and effects setup and make your connections based on how you intend to use it. Before making any connections, it is good practice to turn off all of your amplifiers as this will prevent plug-in or power-on transients that could damage more sensitive components. Once you have made the connections, you can plug in the Twinline's 15VDC power supply. This activates the Twinline as there is no power switch. A handy cable lock may be used to secure the cable in place.

Connecting the two loops

When making connections, ensure you are using high quality coaxial unbalanced guitar cables with ¼" connectors. Good quality cables help reduce noise while retaining signal integrity. Try to keep the cables as short as possible. You will need at least six (6) guitar cables for the basic hookup.

Start by connecting your two amp effects loops to the Twinline:

  1. Connect the effects loop SEND from your first amplifier to the Twinline FROM AMP A input.
  2. Connect the TO AMP A from the Twinline to your first amplifier's effects loop RECEIVE jack.
  3. Connect the effects loop SEND from your second amplifier to the Twinline FROM AMP B input.
  4. Connect the TO AMP A from the Twinline to your second amplifier's effects loop RECEIVE jack.

Next, you can either connect your pedalboard (guitar effects) or studio processors to and from the Twinline:

  1. If using unbalanced guitar pedals:
    1. Make sure the rear panel effects select switch is set to the UNB (unbalanced) out position.
    2. This switch is recessed to prevent accidental switching.
    3. Connect from the Twinline SEND to the input of your first pedal.
    4. Connect from your last pedal to the Twinline RECV (receive).
  2. If using a balanced studio processor:
    1. You will need two balanced XLR cables.
    2. Set the rear panel effects select switch to BAL (balanced) or the in position.
    3. Connect from the Twinline XLR SEND to the input of your processor.
    4. Connect from your processor to the Twinline RECV (receive) XLR input.

You are now ready to power up. Make sure the volume levels on your amps are turned down before turning them on. Plug in the Twinline's power supply, turn on your amps. Set the send and receive loop controls on the Twinline to 12 O'Clock. If your amp has variable level controls, they should be set to the manufacturer's recommended setting to start.

Select loop-A using the A-B switch on the Twinline front panel. The LED indicator will illuminate to let you know which channel is active. Bypass the effects to test by setting the FX ON switch in the OFF (out) position – this LED will go off. Slowly bring up the volume on your first amp and test. Always test at low volumes to ensure things are working before turning up. This can help eliminate turn-on or connection transients from cables that may not be seated correctly.

Once you have confirmed the signal is passing, activate the Twinline's effects loop by depressing the FX ON switch. The LED will illuminate. You can now play using your effects. It is a good idea to use a clean effect such as a delay or chorus to set the levels. If you hear distortion, reduce the SEND level and then adjust the RECEIVE level for gain make-up. If the sound seems thin… increase the SEND level to suit. You cannot harm pedals by overloading them, they will simply distort.

It is important to note that when combining various products together such as amps, switchers and pedals, it takes a bit of fiddling to get the levels to work properly. Be patient and try different settings. Take notes on what you like, and then once you have made your setup decisions, keep it as a reference.

You are now ready to test the second amps effects loop. To do this, select Amp-B using the front panel AB switch, bypass the effects for testing (FX switch out) and then if all is good, reactivate the effects (FX switch-in). Set your levels to suit this amp and you are now ready to rock!

Remote Controlling the Twinline

With all of these cables going back and forth to the Twinline and your amps, it is best to keep the Twinline near your amp where you can hide the cable mess and keep the cables short. You can then remotely switch the Twinline using a standard latching footswitch, a Radial-equipped Slingshot pedal, the optional JR2 remote or MIDI switcher.

  1. Using a standard footswitch
    Connect a latching footswitch with ¼" connector to the Slingshot remote jack on the Twinline. Once depressed, this will toggle the effects loops from Amp-1 to Amp-2. The LED indicators on the Twinline front panel will let you know which amp effects loop is active.
  2. Using the Slingshot Remote
    Some Radial pedals like the Loopbone™ or SW2™ are equipped with a Slingshot remote output jack. This acts just like a latching footswitch and allows more than one action to occur at one time. For instance, you can use the Loopbone to toggle the Twinline's AB select and activate a rack-mount studio effect with a single foot stomp. This employs a standard ¼" guitar cable.
  3. Using the Optional JR2™ Remote
    The Radial JR2 is a dual footswitch remote that can toggle the AB loops and bypass the effects altogether. It receives current from the Twinline to power its LEDs thus providing visual status at your feet. Connection from the JR2 is accomplished using a standard ¼" TRS cable.
  4. Using the Slingshot out from the Twinline
    To take things even further, the Slingshot out can be connected to a Radial device like the Headbone which can then switch heads and toggle the effects loops at the same time. For many this is the ultimate setup. Simply connect the Slingshot output to the Headbone using a ¼" guitar cable.
  5. Using a MIDI Switcher
    A great way to toggle the Twinline is to use a MIDI footswitch controller. Simply take the latching contact closure output from your MIDI controller and connect it to the Twinline remote input. You can also use a second contact closure to bypass the effects loops by creating the following dual mono to stereo connection.

The Polarity Reverse

Both of the Twinline effects loops are equipped with a polarity 'invert' switch that reverses the polarity on the effects loop to match the amp. This enables you to phase-match the amps if need be. This is only really noticeable to the ear when both amps are on at the same time.

Rack mounting the Twinline

The Twinline may be rack mounted using the SA optional rackmount kit. This allows either one or two of the Radial Stand-Alone (SA series) modules to be used side by side and only requires a single 19" space for mounting.