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Multi-Way Conventional loudspeakers with crossovers

Baffle Diffraction
Baffle Diffraction
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Old Yesterday, 04:59 PM   #601
gedlee is offline gedlee  United States
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Quote:
Originally Posted by badman View Post
if polars are a priority, the DIYSG driver seems to have it all over the B&C.
There are no polars of a completed system so how can you make that statement?
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Old Yesterday, 08:22 PM   #602
badman is offline badman  United States
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Quote:
Originally Posted by gedlee View Post
There are no polars of a completed system so how can you make that statement?

Click the image to open in full size.

What I'm generally looking for is even spacing of on and off-axis, and in particular, minimal off-axis peaking (don't want the 30 degree plot intersecting 0 deg).

I don't know that the XO or enclosure would matter for some of the issues like at 6k where 15/30 off is hot. Any thoughts on the ways that the raw response in the HF would differ in a completed design? Certainly some baffle diffraction would introduce some of those types of issues, but we don't see as much deviation on the similar, untreated width baffle of the test enclosures for the diysg speakers (particularly the 15").

What mechanisms would be at play in the design that would change polar behavior well above XO or where the device, presumably, has limited energy to excite baffle diffraction? Curious to hear your take here.
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Old Yesterday, 11:16 PM   #603
gedlee is offline gedlee  United States
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I hate those kind of plots (that's how I missed it,) but yes it looks like some significant diffraction of the CD from the edge of the woofer or the CD to woofer connection - a serious downside to coax, but perhaps improvable.
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Old Today, 01:06 AM   #604
AllenB is offline AllenB  Australia
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You don't think the same thing is happening here?
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Old Today, 01:09 AM   #605
Patrick Bateman is offline Patrick Bateman  United States
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The optimum format for a coaxial is to put the tweeter in front and put a phase plug on the woofer.

Two years ago, I demonstrated that here : Synergy Eggstravaganza

And then Danley started selling a similar design here : Studio 1 | Danley Sound Labs, Inc.

Tymphany patented the idea three months after I published it, here's their take on it:

Click the image to open in full size.

The reason that putting a phase plug on the woofer works a million times better than sticking the tweeter in the throat is because high frequencies are so short. For instance, 13500Hz is an inch long. Due to that, even the *smallest* discontinuity near the tweeter is a problem. The surround of the woofer is a problem. The edge of the woofer frame is a problem.

So a phase plug solves all that - you just cover up the whole darn woofer.
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