The best re-amp box. The debate is finally over

United’s Replay Box offers the very best performance & options for re-amplification. Whether you’re producing the most tone-savvy musician or experimenting with sound design, the Replay Box performs on a level all of its own - with an ultra-quiet design & flexible tone voicing.

WIth two different custom transformers for two unique sonic fingerprints & all of the gain you need, the Replay Box raises the bar for all recordists.

Replay Box features two transformers & Two independent reamp circuits: Transparent & Harmonic

The Transparent circuit features our custom-wound, US-made, 5043 step up transformer, which provides extraordinary signal isolation & noise rejection for mastering-grade quality. It accepts balanced or unbalanced line level input signal to deliver an absolutely clean, isolated, unbalanced output capable of driving any amp, pedal, or processor. Because the transformer is wound to have passive gain, it has about 3 dB of extra gain on tap above its already +4 dB rated input from your DAW or recorder. No active circuitry or other components are involved — you get the cleanest gain available on any re-amplification device.

The Harmonic circuit is for those who want a bit more coloration or fattening in the re-amp stage. Harmonic mode engages another transformer specifically designed to add character. This transformer is wound to offer a steeper gain ratio plus a very gentle rolling-off of the uppermost high frequencies. It adds both harmonic & phase distortion in the sub-bass region, fattening the low mids & delivers a more aggressive warmer tone

Until now, this dual-transformer design was never commercially available & only existed in the hands of a few. Replay Box is the culmination of two decades of experimenting & user feedback from early adopters of Chad Kelly’s early hand-made reamplification boxes. These early units became the secret weapons of top industry engineers the world over & over the years, their insights refined the design