loudspeaker phase checker

[bong]

Dear all, I am looking for schematic diagram of loudspeaker phase checker, I dont know which web site that I can look into?
Thanks😕

 

[halojoy]

not long ago, there was some posts about phase checkers
I will use search.

Here it is:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=7841

 

[planet10]

Do you want to measure phase (mostly done by computer now)


or check polarity (use a battery -- when it is temporarily connected and the cone moves out, the wire hooked to the positive terminal of the beattery is the positive terminal)

dave