measure the polarity of a chassis - Home Theater Forum and Systems - HomeTheaterShack.com

Old 03-29-16, 05:29 AM Thread Starter
Shackster
Alpi

Join Date: Apr 2011
Location: Austria
Posts: 28
measure the polarity of a chassis

how can I measure the polarity (wrong or good) of chassis with REW ?
I measure in a distance of one meter in front of the chassis with the 0 ° Calibrationfile of microphon.

thanks, Alpi
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Old 03-29-16, 04:19 PM
REW Author

John

Join Date: Apr 2006
Location: UK
Posts: 6,308
Re: measure the polarity of a chassis

If you mean the drive unit polarity, you can get an indication from the direction of the impulse response when the display is set to % (not to dB). It can be tricky though if you are measuring a speaker with multiple drive units.
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Old 03-29-16, 10:31 PM Thread Starter
Shackster
Alpi

Join Date: Apr 2011
Location: Austria
Posts: 28
Re: measure the polarity of a drive unit

Hi John,

yes i mean the drive unit polarity. I have an active System and i measuring only one drive unit because my Problem is i can't read the Graph.

Center only the bass unit

left only the bass unit

right only the bass unit

thats are the right Graph?
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Old 03-29-16, 10:34 PM Thread Starter
Shackster
Alpi

Join Date: Apr 2011
Location: Austria
Posts: 28
Re: measure the polarity of a chassis

And here the SPL of the Center Bass Unit:

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Old 03-30-16, 02:19 PM
REW Author

John

Join Date: Apr 2006
Location: UK
Posts: 6,308
Re: measure the polarity of a chassis

You have plotted the envelopes, those won't help as they are always positive. It is the impulse response you need to look at, which is the first trace in the Impulse Response graph.
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Old 03-31-16, 11:20 PM Thread Starter
Shackster
Alpi

Join Date: Apr 2011
Location: Austria
Posts: 28
Re: measure the polarity of a drive unit

Thank you, here the new measures only for the bass unit and i hope this was the right graphs.

Center only bass unit

left Speaker only bass unit

right Speaker only bass unit

Alpi
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Old 04-01-16, 01:34 PM
REW Author

John

Join Date: Apr 2006
Location: UK
Posts: 6,308
Re: measure the polarity of a chassis

They all have the same polarity.
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Old 04-01-16, 10:59 PM Thread Starter
Shackster
Alpi

Join Date: Apr 2011
Location: Austria
Posts: 28
Re: measure the polarity of a chassis

Hi,

you see that on the first peak?

thanks, Alpi
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Old 04-02-16, 05:25 AM
REW Author

John

Join Date: Apr 2006
Location: UK
Posts: 6,308
Re: measure the polarity of a chassis

Yes, the highest peak at the start of the IR.
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Old 04-03-16, 12:22 AM Thread Starter
Shackster
Alpi

Join Date: Apr 2011
Location: Austria
Posts: 28
Re: measure the polarity of a chassis

Thank you!

best regards, Alpi
alpenpoint is offline

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