FH-168 Speaker Polarity Tester

This Speaker Polarity tester Useful more in BGM speakers to check , that in the Zones all speakers are connected properly- during commissioning . With + ve : it push the air or you can say the speakers cone moves forward. With -ve : it pull the air or you can say the speaker cone moves backwards In case you do not find any marking + or - On the speaker You can use small battery 🔋 Via small wire - tap the speaker terminal At the same time feel the speaker cone moves forward/ outwards It’s + ve of battery 🔋 connected to +ve terminal of speaker : speaker cone moves forward/ outwards Good luck