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Old 1st October 2005, 09:09 PM   #1
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Default Checking tweeter phase

OK I made a real dumb move when installing some tweeters for my DIY car project. The terminals were coated with color. I soldered on a connector and then desoldered it. Now, I have no idea which one is + and which one is -. There are NO other markings or designations on the tweeter. The plugs are both the same.

Obviously I cant do the DC current from a AA sized battery because it is a 19 mm tweeter. So, I thought of another bright idea. I used my Sheffield Test Disc and tried to play thru the system some polarity pulses that show up if I record it to my computer and analyze the audioform using SoundForge. They are 3 positive followed by one negative pulse. It worked great if I directly recorded the disc to harddrive thru digital output, but I ran a microphone thru a Spirit Folio mixerboard, to my Minidisc recorder and played it thru my computer as well, but no dice. The polarity pulses no longer showed up. I then tried it with a sine wave with the negative side clipped, and those didn't show up either. I'm not sure if it was the Atrac of the minidisc player or what, but I'm out of ides here. Im gonna give it one more attempt this time using a laptop cmputer bypassing the Minidisc player.

The next best thing I can think of, is play some filtered pink noise around the X over frequency to the midrange and try flipping the phase, see if I can tell a noticeable difference in the response near the X over frequency.

Any other ideas???
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Old 1st October 2005, 10:14 PM   #2
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Never mind, I got it. This time I programmed SoundForge onto a Laptop, skipped the Minidisc player and voila, the phase marks are distinctive.

Good news is I did find out my tweeters were out of phase. So now I can correct
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Old 1st October 2005, 11:09 PM   #3
bogicp is offline bogicp  Yugoslavia
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eRiCdWoNg,

Why you dont try to wire tweeter and measure response with MLS if you have large deep in overall frequency characteristic at cross point frequency, you swap + and -

Best regards

-boggy
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Old 1st October 2005, 11:11 PM   #4
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It should be noted that boggy's reply was in the moderation queue before Eric sorted it out, hence the wrong order.

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