ZT Lunchbox Cab LBC1Passive extension speaker for original Lunchbox Amp (LBG2) The ZT Lunchbox Cab is a passive extension speaker, with the same cabinet and custom design 6. 5 driver as the ZT Lunchbox amp. Adding the Cab to a ZT Lunchbox amp increases overall output and adds a bit of bottom end to your system. Whether you build a Lunchbox stack or spread them apart on stage, the Lunchbox Cabs built in phase switch provides accurate sound in any situation. FEATURES