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