Review on 🔊 Actopus Car Audio Speaker Phase Meter Polarity Tester PH Phasemeter for Enhanced SEO by Jeremy Jackz

This simple and inexpensive tool instantly diagnosed 3 speakers installed by a technician with the wrong phase (plus and minus). Since they were connected to the factory speaker wires, it wasn't clear where + and where -, but this unit gave the answer straight away and we can fix the connections. The instructions could have been better but with a quick web search the easy way to use this and the disc that came with it was clear. You must have a CD player to use the disc to create test sounds.