The best re-amp box. The debate is finally over. United’s Replay Box offers the very best performance and 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 and flexible tone voicing. With two different custom transformers for two unique sonic fingerprints and all of the gain you need, the Replay Box raises the bar for all recordists.