Question on mounting Geddes' Waveguides. - Page 3 - diyAudio
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Old 27th February 2009, 02:48 AM   #21
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I used to use the PE 12" waveguide before I got ahold of some OS 'guides with the foam plugs. I ran them in a horn-12-15 3-way setup:

Click the image to open in full size.

The white crap you see is clay used to smooth out the transition to the compression driver. I also cut the srew-mount off and changed it to a bolt-on:

Click the image to open in full size.

The PE units don't misbehave too bad, but they are not constant directivity (slightly increasing so if you eq the listening window flat, off-axis is slightly downward tilted), and of course they don't have the benifits of the foam plug. But, they are dirt cheap, and they are easy to mount.
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Old 27th February 2009, 02:50 AM   #22
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Wow this is a G-rated forum... the blanked out word is c r a p!
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Old 27th February 2009, 02:57 AM   #23
JoshK is offline JoshK  Canada
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I had missed that you said you used liquid nails. That would work! I have a bunch of that (home renovations).
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Old 27th February 2009, 03:02 AM   #24
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Yeah that's my standard miscellaneous audio adhesive... worked fine in this case. The back was glassed into the box so it probably doesn't do a whole lot now, but it held for the time being.
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Old 27th February 2009, 01:20 PM   #25
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an easy way to cut this...

first with a perfect circle cut the outside diameter on a piece of 1/2 mdf..

then with 2way tape... tape the fiberglass wave guide to the wood circle... then on a table router using a flush trim bit make the guide a perfect circle...
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Old 27th February 2009, 04:47 PM   #26
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Is there agreement on what material is best for damping the back of the WG? I have a pair of Geddes 15-inch and I attached strips of FATMAT (similar to Dynamat) but it sticks much better. My WGs have the mdf mount attached to the WG with liquid nails. Wondering if I could just coat the entire rear of the WG with liquid nails or bondo. It still sounds slightly ringy to me.

Overall though I am a very happy Geddes WG customer. Stunning sound with the DE250 and Geddes xover.
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Old 27th February 2009, 06:24 PM   #27
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once attached... "since it looks like a fiberglass guide" you can do a layer of resin and sand on the back side to add mass.. then do a layer or two of damping material like fat mat...raammat...second skin.... you can always do some Second Skin sludge?
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