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It's easy to reduce the effective volume after completion by adding filler material, so you could go a little larger if you want.
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If you are still set up to measure, I'd check off axis to see if anything odd shows up. Also, you can turn the speaker sideways for measurements, and...
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Maybe alter that contour shown in the picture above, that just happens to be at a suspect distance....
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I would be tempted to try a different shape contour on the grill. Something less symmetrical. Small dimensions affect higher frequencies.Maybe shift one...
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OK, someone has to disagree, so it might as well be me! Start with a realistic budget. If under $200 for a pair, then maybe a kit is a safer venture...
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Waste of time! Most of the contests had restrictive rules to make it harder to make a competent speaker. Only 5 xo parts. Only 3l, only 12" tall....
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If you want to see the woofer alone, temporarily add a 999 ohm resistor in front of the mid, and tweeter, then look at the total speaker impedance.
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I can't see any pictures of the speaker, but here's what I'd try.
The mid may be influenced by the woofer nearby, or the other mid may be...
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Here's what I came up with using PE data. These appear to have similar transfer function as your filter. I think these would have higher impedance, but...
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I'm getting lost in the details, so not sure. However, the coil in the woofer circuit increases the impedance as the frequency increases.
...
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I'm not an EE, but see if this sounds logical. Imagine the voltage to the speaker is 16 volts. Look at your impedance. (Pick a frequency.) If the impedance...
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Three-way x-overs can be a little tricky. I measure close mic on the woofer, but also from 3' or so. I don't think I could describe precisely how I arrive...
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Did you filter (EQ) the mid to follow a 4th order target on axis, or did you just dial in a 4th order filter?
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What if you embedded some magnets on the back side of the grill. Then use a hand held magnet from the outside to attract the ones in the grill.
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