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Re: 3Pi Acoustic Axis and Listening Distance [message #91262 is a reply to message #91261] Sat, 14 December 2019 11:59 Go to previous messageGo to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18678
Registered: January 2001
Illuminati (33rd Degree)

What I would define as the forward lobe centerline is the midpoint between the two vertical nulls. You can see in the video I posted in the message above exactly where those nulls occur. Watch the video for the position of the microphone above and below the speaker where you see a notch around 1.2kHz. The midpoint between them is the centerline of the forward lobe.

Bear in mind that speakers that provide constant directivity don't need the listener to be perfectly on-axis with the forward lobe centerline. As long as the listener is within the 90° x 50° pattern, sound quality is good. That's one of the main benefits of having a speaker like this.
 
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