When a rig goes silent, the fastest fix is a reliable test signal and a clear way to confirm whats happening-at both ends of the cable. XVIVE AT-3 Audio Tester Ultra is a professional troubleshooting tool designed for live sound, church audio teams, AV techs, rentals, and studios. It combines signal generation, long-run cable testing, phantom power checking, input metering, and on-the-spot monitoring in a split, two-unit system. What makes AT-3 different from AT-2? AT-2 is a compact all-in-one tester. AT-3 is a split-design system built for long runs and one-person troubleshooting. AT-3 includes two independent units: AT-3M (XLR male): sends test signal and checks phantom power on the output XLR AT-3F (XLR female): receives input, shows input level indication, and provides monitoring Why split matters: you can place one unit at the console end and the other at the far end (speaker/stage box/wall plate), so you can verify signal flow without walking back and forth. If you mainly troubleshoot short cables right in front of you, AT-2 is often enough. If you regularly deal with long XLR/DMX runs, installed systems, stage boxes, or venues where you cant hear the speakers clearly, AT-3 is the faster tool. Key advantages of AT-3 (real-world workflow) Long-distance XLR/DMX cable testing: use the split units for end-to-end cable checks and pin fault diagnosis on long runs. Built-in signal generator: output 1kHz sine or pink noise with three output level options (-40 / -20 / -10 dBu, 1 dB) to verify mixers, PA speakers, DI boxes, pedals/effects, wireless/IEM chains, and more. 48V phantom power check (pins 2 & 3): phantom voltage is metered per pin with clear LED behavior (solid: 44-52V; flashing: 24-44V). XLR input metering LEDs: SG indicates signal detection (above about -20 dBu RMS) and PK warns when the input is very loud (above about +10 dBu RMS)-useful in noisy venues. Monitoring at the receiving end: AT-3F provides 1/8 headphone monitoring and a built-in speaker (the speaker automatically mutes when headphones are plugged in), with a dedicated volume knob. USB-C rechargeable + low-battery warning: charge with a standard USB-C cable and any 5V/2A USB power supply; a full charge takes about 1.5 hours. If youre choosing between XVIVE AT-2 and AT-3: Choose AT-2 for an all-in-one pocket tester for quick local checks. Choose AT-3 when you need a split system to test long cable runs and confirm signal at the far end with headphone/speaker monitoring on AT-3F.