A/B Box

The A/B Box is a compact passive switcher from EarthQuaker Devices. One input, two outputs (or one output and two inputs — it runs either direction because the circuit between them is just wire). A single footswitch chooses between A and B. Useful for A/B-ing two amps, switching between two guitars into one amp, muting the signal path for silent tuning, or running separate dry and wet paths in parallel. Because it's fully passive with no buffer, there's no tone coloration but also no protection against signal loss over very long cable runs. 3.7 x 1.8 x 1.8 inch enclosure — one of the smallest EQD makes. No battery, no adapter, nothing to fail.