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May 2004 |
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I had the MTM set up in a larger room and we
listened to a wide variety of music with the 800hz crossover. We
listened to some Copeland, and even my wife was impressed, now that's
saying something. When you sit in the sweet spot they sound incredible,
and they sound good when you stand up as well. I also set up the system
as a TMM but haven't had time to do any in-depth listening tests. I've
been working on other things while I wait for the horns to arrive.
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The horn prototype is now complete. As you
can see I have sealed the MDF as the raw MDF was very soft and fuzzy
even after sanding. I was concerned that it could affect the sound as I
have been told that a smooth finish versus a rough one can make audible
differences. This MDF horn is in halves that screw together. If I leave
it as is it can be disassembled and molds taken off of it if members
wanted to cast fiberglass copies of it. Due to negative draft in the
design, a mold will not be possible if I glue it together. If it is
glued together I can massage the seam. As it is now there is a
noticeable seam, but I doubt it will affect performance (you know like
those dented dome tweeters on eBay ) Seriously, I don't think it will
affect performance... but those with bat hearing might ... I doubt it.
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I started laying out and machining the mounting flange earlier this evening. It will be made of 0.25" aluminum plate that bolts onto the driver with flush screws and then gets bolted to the rear of the horn as seen in this earlier illustration. There will be a 2.5" hole in the plate that allows the machined wooden horn throat through to mount flush with the driver. (This will make sense when I post a photo of it.)
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I will ship to Tim one 435Be driver and one
045Be driver with it's plastic horn with my MDF horn. Tim should be able
to rig the UHF horn/driver to the top of the MDF horn with modeling clay
and foam core to position it and simulate a baffle. This should allow
various position tests.
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Ok, here at long last is a finished MDF
prototype horn with mounting flange.
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A pair of stock JBL Sonoglass H9800 horns
are shipping from JBL for prototype development courtesy of Paul Bente
and Greg Timbers. I cannot thank these gentlemen enough for their
continued support with this endeavor! |
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