Designed to ease and speed up the task of checking loudspeaker polarity, the Gold Line APT2 ensures consistency across multi-speaker installations. It allows an entire system to be checked in seconds, including individual drivers and complete cabinets, as well as equalizers, amplifiers and crossovers. The unit’s performance is unimpaired by passive crossovers, or by signal waveform distortions produced by the device under test, and is supplied complete with a