United Replay Box – the new benchmark in professional reamping Whether you’re a professional engineer, producer or sound designer – the Replay Box from United Studio Tech is the ultimate tool for uncompromised reamping. It combines two distinct signal paths, superior signal purity and rugged, tour-ready design in one box.

Product Features Two independent modes: Transparent and Harmonic Ultra-low noise operation with galvanic isolation Rugged aluminum chassis with mounting options Built-in features: Phase Invert, Ground Lift, Thru Out Clean signal or enhanced color – your choice Transparent Mode uses a custom-wound 5043 transformer made in the USA. It offers +3 dB of passive gain and maximum signal purity – ideal for mastering-grade applications. Frequency response is 20 Hz–20 kHz with ±0.5 dB tolerance. Harmonic Mode engages a second transformer designed for subtle harmonic saturation and warmth. It provides +5 dB of passive gain and imparts a thicker, slightly more aggressive tone that works great with DI tracks and guitars.

Applications The Replay Box is the perfect solution for guitar and bass reamping, synths, DI sources, and creative sound design. Its passive, interference-free operation and robust build make it equally suited to studio or live setups.

Technical Specifications Input Impedance: Transparent – 300 Ω, Harmonic – 50 Ω Output Impedance: Transparent – 1 kΩ, Harmonic – 150 Ω Frequency Response: Transparent – 20 Hz–20 kHz ±0.5 dB, Harmonic – 40 Hz–20 kHz ±0.5 dB Gain: Transparent – +3 dB, Harmonic – +5 dB Recommended Input: +4 dBu balanced line level Extras: Ground Lift, Phase Invert, Thru Out Dimensions: 149 × 155 × 52 mm (with feet) Weight: 0.8 kg / 1.76 lbs Materials & Build Crafted from anodized aluminum with screw-mounted rubber feet, the Replay Box is both lightweight and tough. Passive construction means no power is needed – perfect for mission-critical live and studio use without fail points.

Included in the Box United Replay Box – dual-mode reamp unit Quick Start Guide (EN, DE, FR, ES) Full User Manual (available online as PDF) Protective foam-padded shipping box Why choose the United Replay Box? The Replay Box brings together two premium-grade reamp circuits in one device. With studio-level sound, tonal versatility, and intuitive features, it’s a tool built for serious creators. Based on over 20 years of prototyping by Chad Kelly, it’s already a trusted weapon in the world’s best studios – now available to all.