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Multi-Way Conventional loudspeakers with crossovers

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Old 16th March 2013, 11:14 PM   #601
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Fixed the errors in the waveguide.

Perfect fit now particularly around the throat where it meets with the dome. Measures arguably better than scanspeaks original faceplate. Displays similar characteristics to Seas DXT.

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File Type: jpg Baffle Insert 04.jpg (159.4 KB, 1018 views)
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File Type: jpg Baffle Insert 06.jpg (144.0 KB, 1002 views)
File Type: jpg Baffle Insert 07.jpg (162.9 KB, 998 views)
File Type: jpg Baffle Insert 08.jpg (161.1 KB, 1005 views)
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Old 16th March 2013, 11:55 PM   #602
_henry_ is offline _henry_  Australia
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great looking as always.

have u played around the curve and depth of the waveguide before u made it? dave pellegrene did alot of experiment of all kinds of shape to xt19, hds and sb29. although it involves round and elliptical shapes, but he did mention some of the problems with the throat to the measurement (giving odd and irregular responses), but i can see it fits cleanly on yours

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Old 17th March 2013, 12:45 AM   #603
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great looking as always.

have u played around the curve and depth of the waveguide before u made it? dave pellegrene did alot of experiment of all kinds of shape to xt19, hds and sb29. although it involves round and elliptical shapes, but he did mention some of the problems with the throat to the measurement (giving odd and irregular responses), but i can see it fits cleanly on yours

cheers
henry
henry
Thanks Henry.

I've played somewhat with the waveguide shape in software but not done as much real world testing as I'd like. My observations have been that by far the most critical area is the throat interface with the dome. Even small changes here make big differences and if its flat out wrong like there's a gap between the dome and throat edge then the response is ragged and often horrible. The shape of the dome plays some role too. I have Scan 6600 with a rounded fabric dome as well as the same tweeter with the flatter beryllium dome and get quite different results.

Now that I have the throat dialled in I can go ahead and start trying out some of the other profiles I have.
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Old 17th March 2013, 01:27 AM   #604
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By the looks of those, you could probably make a few extra bucks on the side just by selling wave-guides of various sizes!
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Old 17th March 2013, 01:31 AM   #605
cersepn is offline cersepn  United States
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Amazing work, ShinOBIWAN . Thanks for documenting your journey, the pictures are great and i always look forward to seeing more updates. You do such great DIY!
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Old 17th March 2013, 10:33 PM   #606
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Quote:
Originally Posted by _henry_ View Post
dave pellegrene did alot of experiment of all kinds of shape to xt19, hds and sb29. although it involves round and elliptical shapes, but he did mention some of the problems with the throat to the measurement (giving odd and irregular responses), but i can see it fits cleanly on yours
I've got a batch of different small waveguides designed by DP... There is a very large difference in the top octave response caused by the throat matching. Some guides which actually cover over the surround of the tweeter have a very very good response, which surprised me a lot.

Loving the pics Ant. Thanks for posting.
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Old 17th March 2013, 10:45 PM   #607
ScottG is offline ScottG  United States
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Originally Posted by ShinOBIWAN View Post
..Fixed the errors in the waveguide.

Perfect fit now particularly around the throat where it meets with the dome..

Click the image to open in full size.
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Old 9th April 2013, 05:23 PM   #608
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Any progress ?
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Old 10th April 2013, 01:49 AM   #609
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Some progress yes but its mostly mundane stuff like lining the internals with lead, stuffing, cabling, connectors and that sort of thing.

I'm cutting some more parts this week and will update.
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Old 10th April 2013, 08:38 PM   #610
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More pics

The foot that the cabinets sit on. Nice and strong too so as to hold the considerable weight.
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Waveguides for tweeters:
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Spacers for the subs to mount against when coupling them together for out of phase mechanical cancellation. More on this soon.
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Attached Images
File Type: jpg Apollo21.jpg (131.9 KB, 631 views)
File Type: jpg Apollo22.jpg (99.7 KB, 623 views)
File Type: jpg Apollo23.jpg (85.1 KB, 625 views)
File Type: jpg Apollo24.jpg (133.4 KB, 631 views)
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