The BOSS AB-2 is a two-channel selector. Its pedal switch toggles between Channel A and Channel B, and Indicator A (red) or Indicator B (yellow) shows the selected channel. The manual gives examples for using it as an input selector between two guitars, an output selector between two guitar amps, and a tuning mute that switches between a tuner and a guitar amp.
The Notes section says not to use the unit for switching power amp speaker outs or other powerful signals, and to turn down volume and turn off power on all devices before connections. Battery replacement uses two AAA batteries; if an indicator loses brightness, the batteries are nearly dead. Specifications list nominal input and output level, connectors, current draw, power supply, dimensions, weight, and accessories.
| Nominal Input Level | -20 dBu |
|---|---|
| Nominal Output Level | -20 dBu |
| Control | Pedal |
| Indicators | A (red), B (yellow) |
| Connectors | A jack, B jack, IN/OUT jack |
| Current Draw | 5 mA or less |
| Power Supply | Two AAA dry batteries |
| Dimensions | 96 (W) x 90 (D) x 43 (H) mm |
| Weight | 240 g / 9 oz |
| Expected battery life (carbon) | 100 hours |
The BOSS AB-2 is a two-channel selector.
Depress the switch to toggle between Channel A and Channel B.
It uses two size AAA batteries.
Check whether Indicator A (red) or Indicator B (yellow) is lit.