Question on mounting Geddes' Waveguides. - Page 2 - diyAudio
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Old 19th February 2009, 04:46 PM   #11
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If that's the case, why mount them to a baffle? Just set them on top of your closed / open-baffle woofer.


The remountable method seems doable.

Cut a plywood ring with maybe .75 width. Insert some T-nuts and then epoxy it to the back of the waveguide.

Not sure if you can use a router bit to do this but you could then trim the waveguide flange flush against your plywood ring.

Now you can cut a rebate into your baffle, drop in the waveguide and fasten from the inside of the baffle.
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Old 19th February 2009, 05:44 PM   #12
JoshK is offline JoshK  Canada
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That is what I was trying to describe in my above post.
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Old 19th February 2009, 05:50 PM   #13
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Oops! I totally missed that! Sorry.
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Old 19th February 2009, 05:51 PM   #14
JoshK is offline JoshK  Canada
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No problem. You did a much better job explaining it than I did, plus the picture is worth the 1,000+ words.

The more I think about it the more I am tempted to take this route.
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Old 20th February 2009, 02:13 AM   #15
JoshK is offline JoshK  Canada
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Well I cut a "rim" of 11" inner diameter and 12.5" outer diameter. We shall see if I have any luck mating it to the WG. There is still contour at 11", so need to do some sanding.
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Old 20th February 2009, 02:14 AM   #16
JoshK is offline JoshK  Canada
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By the way, I like the spine idea. I think I might borrow that. I'll give me piece of mind if nothing else.
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Old 23rd February 2009, 12:43 AM   #17
JoshK is offline JoshK  Canada
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Well got one WG countersunk into the baffle. Started to make the rim re-mountable idea but it turned out to bring up some headaches that weren't easy to overcome.

I cut 11" hole, dropped the WG into the hole. Drew an outline of the square mouth. Clamped some excessive MDF as a guide to the baffle. Used a template cutting bit to countersink the area.

Then the fun began. Took orange chalk and coated the back of the WG and knocked the excessive off. Pushed the WG into the hole. Noted where the chalk made a mark. Took my dremel with a sander roll thingy and sanded down. Repeat many many many times. Ultimately making a contour matching that of the WG.

Since I didn't cut the corners of the square mouth off, I have more area to adhere to. Now I get to do the whole thing over for the other. Fun stuff. Only took the last 6 hours.

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Old 23rd February 2009, 11:58 AM   #18
fb is offline fb  Australia
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http://www.parts-express.com/pe/show...number=270-312

12" PE Waveguides are back in stock.

They're cheep and they mount like drivers do.....




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Old 23rd February 2009, 01:51 PM   #19
JoshK is offline JoshK  Canada
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I have a pair of those that I bought out of curiousity. They are cheap, in more ways than one. It isn't hard to dampen them some, but the critical throat is pretty sloppy.

I am sure you can make it work, but when paired with a pair of BMS 4540s I had the throat transition was sharp there was also a bit of a gap iirc. The mouth terminates early. The profile itself is more exponential I think. All in all a good deal though.

Probably wouldn't take much more work to make them usable then these waveguides. But, its the profile and the throat that hopefully makes Geddes WGs worth it.
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Old 27th February 2009, 01:01 AM   #20
JoshK is offline JoshK  Canada
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Does anyone know what kind of adhesive is best for affixing the fiberglass to MDF?
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