H frame vs W frame dipole woofers - diyAudio
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Old 15th November 2004, 02:55 AM   #1
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Default H frame vs W frame dipole woofers

Iím going to build SLís Phoenix, but am attracted to the all in one design of the Orion. For one thing it'll be easier in a shared room.to move around two boxes rather than four. So Iím thinking of mounting the Phoenix midrange baffle onto the Orion H frame woofer cabinets.

The W frame is wider and lower; the H frame resonance is higher (but with an XO at 120 Hz, both resonances are relatively outside the effective range of the woofers) and by the way the drivers are mounted - the W frame has the benefit of force cancellations.

What do people think of the Ďhybridí approach?

Thanks

Thanks
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Old 15th November 2004, 03:12 AM   #2
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That's exactly what I did, so I obviously think it is a good idea.

Steve
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Old 15th November 2004, 06:07 AM   #3
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The integrated Orion style cabinet couples the strong twin bass driver forces, directly to the mids & tweeters. By SL going this way, this did not *appear*be a problem.

Though the sound of the Orion can now be improved - Revision 0.1 http://www.linkwitzlab.com/orion-rev1.htm - by decoupling the mids from the mid range panel!
So maybe something was lost in integration . .
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Old 15th November 2004, 08:46 AM   #4
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Default best of both worlds?

Beginning to think that the best all round compromise is to do a woofer Ďboxí Orion - H style, sitting underneath the midrange baffle, but just sitting off it, isolating vibrations.
This would still have the integrated look, and allow experimenting with different-better woofer locations, when "she who likes to be obeyed" is away and/ or I move to a bigger room.

It does mean I'd need a pair of inverted U shaped brackets to support the midrange baffle, straddling the woofer box. Though these could be used as a base, to support midrange driver brackets a la Orion Revision 0.1. This may be a simpler path to further midrange driver isolation than the Phoenix midrange driver spline arrangement, which I hear can be fiddly to construct.

I suspect that Phoenix XO would not require any change, but I still need to confirm or check this??

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Old 15th November 2004, 11:26 AM   #5
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Equally of course you could do them *W frame Phoenix* style sitting just underneath the midrange baffles, with U shaped brackets to support the midrange baffles.

(Then the Phoenix XO would not require change)
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Old 15th November 2004, 04:21 PM   #6
Davey is offline Davey  United States
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Rick,

Any kind of a hybrid.....W or H, with Orion or Phoenix style main panels is do-able. There might be some changes required to the crossover system depending upon how you implement it. Generally, a W-baffle would probably require a notch filter and an H-baffle probably wouldn't. The fore/aft position of the mid-panel relative to the bass baffle might also require some time delay.

The force cancellation of the W-frame woofer is desirable if your floor construction/support is marginal. If you're on a slab or some other solid base then I don't believe the H-frame construction would be a problem.

I think isolating the mid-panel from the bass is desirable in all instances.

Davey.
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Old 16th November 2004, 03:14 AM   #7
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I have my main panel and H-frame box constructed as separate units to decouple them somewhat. The main unit normally fits over the bass, but you can see how they work here:

Click the image to open in full size.

There is a cross brace at the back of the main unit for stability.

Steve
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Old 16th November 2004, 03:20 AM   #8
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Good thinking Steve.

What do think of John Kís claims for higher output in the NaO U frame?
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Old 16th November 2004, 10:55 AM   #9
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I suspect he's right. I tried mine as a U-baffle and an H-baffle and I did get he impression that the U had more output.


Steve
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Old 16th November 2004, 10:55 PM   #10
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Though was there more room interaction with the U Frame?
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