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Re: 4pi: Cabinetmaker's build [message #99565 is a reply to message #99564]

Tue, 07 July 2026 20:13

Wayne Parham
Messages: 19058
Registered: January 2001

Illuminati (33rd Degree)

That chart shows the overall tonal balance, but it can't show the sharp dips we would expect to see from a crossover null.

If the polarity is right, you'll see nulls at approximately +-20 degrees above and below the speaker. If it's wrong, you'll see a null on-axis.

Watch this video to understand what I'm expecting to see:

Vertical Nulls

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Re: 4pi: Cabinetmaker's build [message #99568 is a reply to message #99291]

Wed, 08 July 2026 08:10

dustboy
Messages: 13
Registered: March 2026

Chancellor

What is the test signal you are using there?

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Re: 4pi: Cabinetmaker's build [message #99569 is a reply to message #99568]

Wed, 08 July 2026 11:36

Wayne Parham
Messages: 19058
Registered: January 2001

Illuminati (33rd Degree)

That was a gated (fast) log sine sweep, often called a "chirp" signal.

My main focus was the crossover region, because I was looking for nulls. You can see them on the computer screen in the foreground when I move the microphone above and below the speaker. Watch for the notches to grow as I get close to the location of the vertical nulls, and shrink back when I get past them.

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