A passive studio re-amper that allows you to take a prerecorded track and send it back to a guitar or bass amplifier and re-record it. It features a 100% passive design with John's original custom wound 'Made in the USA' transformer and circuit. The latest Radial version features separate XLR and 1/4 " TRS input connectors, variable output level plus a three-position filter that lets you tame excessive highs, warm up the lows or simply bypass if you want to revert to the original circuit. An on-board mute function has also been added to allow you to shut off the signal going to the amps when making adjustments or moving mics around the studio. The dimensions of the box are 157 x 107 x 76 mm and the weight 816 g.