Earthquaker Devices AB Box

The EarthQuaker Devices A/B Box puts the power of choice directly at your feet with its brilliantly simple, compact design. This completely passive switching device contains no circuitry between input and outputs, making it incredibly versatile for bidirectional use across your entire rig.

From switching between two amplifiers to toggling channels on multi-channel amps, this little box handles it all. Use it as a tuner out with mute functionality, swap between different instruments, or create separate dry and wet signal paths. The passive design means your tone remains completely uncoloured throughout the switching process.

Power requirements are straightforward - the unit runs on a standard 9-volt DC supply with 2.1mm negative centre barrel connection. EarthQuaker strongly recommends using pedal-specific, transformer-isolated wall adaptors or multiple isolated-output supplies for optimal performance. Switching power supplies, daisy chains, and non-pedal specific adaptors can introduce unwanted noise due to poor filtering of dirty power and ripple.

Critical warning: DO NOT RUN AT HIGHER VOLTAGES! Stick to the specified 9-volt requirement to avoid damaging your A/B Box and maintain reliable operation.