Loudspeaker polarity checker

Rembulan · 1st October 2007, 02:11 PM

Hello everybody,
In multi speaker situation sometimes we can made a mistake to place a loudspeaker wire. I have seen some people use a pulse based polarity checker system but I have search around without a result. any body have idea how to build this checker ?

Nordic · 1st October 2007, 02:45 PM

How about a low voltage low current source like a watch battery connected between the terminals, then note if the cone moves forward or backwards?

djQUAN · 1st October 2007, 02:55 PM

Quote:

Originally posted by Nordic
How about a low voltage low current source like a watch battery connected between the terminals, then note if the cone moves forward or backwards?

I use a 1.5V or 9V battery.

Rembulan · 1st October 2007, 03:00 PM

How about a low voltage low current source like a watch battery connected between the terminals, then note if the cone moves forward or backwards?

Thats not a problem if you can see the driver but if you cant see it like in bandpass or horn. thats procedure will gets dificulties

Svante · 1st October 2007, 05:53 PM

Run my tone generator with a sawtooth wave and record the sound with a microphone and look at it with my spectrum analyzer (which also shows the waveform).

panomaniac · 1st October 2007, 07:56 PM

The sawtooth wave is a most excellent method to check polarity. I use it all the time.

The pulse checkers you are talking about are common in pro sound. You should ask at a music or PA store. I've never seen one in kit form, but there might be one.

dangus · 1st October 2007, 08:13 PM

Elektor Magazine published plans for such a thing, "Phase Check for Audio System", probably in #11 1990. It's also in the book"Build Your Own High-End Audio Equipment".

There's a transmitter box that generates pulses (line and mic level, and audible (if you add a little speaker), and a detector box that works with a built-in microphone or line inputs. I built a set, and it worked. You could probably generate the pulses using an audio editor and burn a CD, which could save building the transmitter box.

It might be on one of the Elektor audio project CD-ROMs, or if you ask a librarian nicely you might be able to get the book through an inter-library loan, or a copy of the magazine article.

Rembulan · 2nd October 2007, 08:27 AM

Thanks for any sugestion I have found The schematic that I looking for from rolls, PT102 thats exactly that I looking for

1st October 2007, 05:53 PM	#5
Svante diyAudio Member Join Date: Feb 2004 Location: Stockholm	Run my tone generator with a sawtooth wave and record the sound with a microphone and look at it with my spectrum analyzer (which also shows the waveform). __________________ Simulate loudspeakers: Basta! Simulate the baffle step: The Edge

1st October 2007, 07:56 PM	#6
panomaniac diyAudio Moderator Join Date: Oct 2004 Location: North Carolina	The sawtooth wave is a most excellent method to check polarity. I use it all the time. The pulse checkers you are talking about are common in pro sound. You should ask at a music or PA store. I've never seen one in kit form, but there might be one. __________________ * Bibo, ergo sum.

2nd October 2007, 08:27 AM	#8
Rembulan diyAudio Member Join Date: Apr 2006 Location: near Borobudur temple	Hi everybody Thanks for any sugestion I have found The schematic that I looking for from rolls, PT102 thats exactly that I looking for

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1st October 2007, 02:11 PM	#1
Rembulan diyAudio Member Join Date: Apr 2006 Location: near Borobudur temple	Loudspeaker polarity checker Hello everybody, In multi speaker situation sometimes we can made a mistake to place a loudspeaker wire. I have seen some people use a pulse based polarity checker system but I have search around without a result. any body have idea how to build this checker ?

1st October 2007, 02:45 PM	#2
Nordic diyAudio Member Join Date: Sep 2005	How about a low voltage low current source like a watch battery connected between the terminals, then note if the cone moves forward or backwards?

1st October 2007, 03:00 PM	#4
Rembulan diyAudio Member Join Date: Apr 2006 Location: near Borobudur temple	How about a low voltage low current source like a watch battery connected between the terminals, then note if the cone moves forward or backwards? Thats not a problem if you can see the driver but if you cant see it like in bandpass or horn. thats procedure will gets dificulties

1st October 2007, 08:13 PM	#7
dangus diyAudio Member Join Date: May 2004 Location: Vancouver Island	Elektor Magazine published plans for such a thing, "Phase Check for Audio System", probably in #11 1990. It's also in the book"Build Your Own High-End Audio Equipment". There's a transmitter box that generates pulses (line and mic level, and audible (if you add a little speaker), and a detector box that works with a built-in microphone or line inputs. I built a set, and it worked. You could probably generate the pulses using an audio editor and burn a CD, which could save building the transmitter box. It might be on one of the Elektor audio project CD-ROMs, or if you ask a librarian nicely you might be able to get the book through an inter-library loan, or a copy of the magazine article.

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