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Shotgun™ Using & Applications

The following page describes how to use the Radial Shotgun. For more details, feel free to download the full manual by clicking the icon at left.

Making connections

Before making connections ensure your amplifiers are either turned off or volume turned down. This will avoid unpleasant plug in transients that could shorten the lifespan of more sensitive components. Set all of the ground lift and 180° polarity reverse switches to the down position. Plug in your 9V power supply. This should be a standard 'Boss' type guitar pedal adaptor or 9V supply from a multi-pedal power brick. There is no power switch on the Shotgun. Once the power supply is connected, it will turn on and the top panel LED will illuminate to let you know power is on.

Connecting to and from the Shotgun is done using standard ¼" hi-Z coaxial guitar cables. Better quality, low-capacitance cables with 90% to 100% shield will improve signal-to-noise. Keeping cables as short as possible on the input side will reduce susceptibility to noise. Once the signal has passed through the Shotgun, longer cables may be used as the Shotgun will buffer the signal and lower the impedance to enable cable runs up to 15 meters (50') without appreciable noise. The Shotgun is a unity gain device. Whatever signal you put in, it will put out - producing the same relative output volume.

To start, test using one input and one output by connecting your guitar to input-1 and your amp to output-1. Note output-1 is the default output and should always be used. This output is not isolated in order to provide a safety ground to the guitar. It should be connected to an amplifier with a proper electrical ground. For safety, always test at a low volume before increasing the levels. Turn up the volume on your amp. You should be getting a nice clean signal. Add your second amp by connecting it from the Shotgun's output-2. If you hear noise, try lifting the ground by pushing the ouput-2 ground lift switch in the up position. Repeat for any additional amplifiers.

IMPORTANT SAFETY NOTICE: As you are the sole user of the Shotgun, you are entirely responsible for using amplifiers, power supplies and effects that are electrically approved by your local authority and are safe for use. If you are unsure of the status of your equipment, please contact the manufacturer or dealer for details. As Radial Engineering Ltd. is unable to control what is being connected to the Shotgun, you agree to take full responsibility its safe use and agree that Radial Engineering Ltd. along with its staff and directors shall not be held responsible in any way for damages of any kind other than those clearly detailed in the Radial Warranty. Should you for any reason feel uncomfortable with the above statement, you should return the Shotgun before use to the dealer in the original packaging for full credit within 7 days of purchase.

Using the 180° polarity reverse

Using amp-1 (output-1) as your reference and amp-2 as the comparator, the easiest way to check to make sure your amps are in phase is to point them at each other, face-to-face or speaker-to-speaker. When you play, if the sound is thin or distant, you are likely out of phase. Simply push the 180º polarity reverse switch in the upward position to bring the two amps in phase. Repeat for amps 3 and 4 – always using amp-1 as the reference.

Using the Shotgun in stereo

In setups where you may have a stereo chorus or multi-tap delay on your pedalboard, sending the output from the pedal to your amps will often cause hum and buzz due to a ground loop. This is because most pedals are not equipped with isolation transformers to prevent the noise.

Simply connect the left and right outputs from your chorus to the Shotgun's 1 and 2 inputs. Once connected to input-2, the Shotgun will automatically shift from mono-mode to stereo-mode. When in stereo-mode, input-1 is routed to outputs 1 and 2, while input-2 is routed to outputs 3 and 4. Connect output-1 to your left amp and output-3 to your right amp. You can also add two additional amps on each side for larger stages.