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Multi-Way Conventional loudspeakers with crossovers

Small Syns
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Old Yesterday, 10:07 PM   #401
bwaslo is offline bwaslo  United States
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Yeah, looks like something off there. Here are some horizontal curves I have from a few years back (done indoors, unsmoothed, angles are 0, 20, 30, 45, 60).

Small Syns-mid-offaxis-plots-png

What happens if you move the mic closer/further? (thinking cabinet edge diffraction maybe).
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Old Yesterday, 10:15 PM   #402
bwaslo is offline bwaslo  United States
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To rule out cabinet effects, try to measure on-axis and watch that peak when you move the mic closer/further as well as higher/lower. See if it stays put or shifts around. I don't know why the peak should drop like that due to anything in the ports -- directivity effects near that frequency should be happening from more near to the end of the waveguide mouth.
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Old Yesterday, 10:57 PM   #403
3ll3d00d is offline 3ll3d00d  United Kingdom
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OK I'll give that a go next time I get the mic out.
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Old Yesterday, 11:29 PM   #404
HammerSandwich is offline HammerSandwich
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Bill, any chance that's a combination of a resonance (on-axis boost) and path-length differences (off-axis null) from the mid ports?
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Old Today, 12:14 AM   #405
bwaslo is offline bwaslo  United States
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Dunno, maybe. Horn Response (not sure I have the same model from then) shows if the port is too small/too short/too close to the throat that can give a peak about there. Maybe try some modeling clay to "lengthen" the ports and see what happens?

Doubt an off-axis null could be there, though. It could only happen from the distance of the ports from each other (tweeter isn't playing!), you'd have to get about 5 inches closer to one than the other from being off-axis for that to happen.
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