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Multi-Way Conventional loudspeakers with crossovers

Concrete line arrays
Concrete line arrays
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Old 3rd November 2019, 12:37 PM   #1
Afflicted is offline Afflicted  Canada
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Default Concrete line arrays

Well after 4 months of hard work, hard lessons and lots of skinned knuckles there finished. 650 lb monster line arrays
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Old 3rd November 2019, 02:30 PM   #2
Tadeusz is offline Tadeusz  United Kingdom
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Were they worth the weight?
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Old 3rd November 2019, 03:40 PM   #3
Max Headroom is offline Max Headroom  Australia
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Location: West Australia, near to the beach, natural ambient sounds mostly.
So the rowing machine is for warming up before attempting to adjust the speaker placements ?.
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Old 3rd November 2019, 04:49 PM   #4
djn is offline djn  United States
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Tell us more about the build? Good idea putting the tweets in front of the woofs. Did you have to do time alignment?
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Old 3rd November 2019, 11:00 PM   #5
Afflicted is offline Afflicted  Canada
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Well, they sound fantastic IMO.

There are 9 Peerless 830869 x 8” wired 3x3 to hold 8 ohms. The ribbons are Newform Research. Bryston 10Bsub sends everything 80hz and below to a twin 15”’ sub. The line arrays are passive x-overs at 1200 hz achieving an acoustic x-over at about 2000 hz. The x-sexction of the speaker is a half ellipse 18” x12” (major/minor). The concrete is 2” thick with 7 vertical post tensioned tie rods to 150 ft lb. Some more pictures to follow. Inner baffle is 3/4” Baltic birch with 1/2” thick 6061 aluminum on outer baffle. Packed with sheep’s wool. Concrete was polished but then I ended up coating in black epoxy.
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Old 3rd November 2019, 11:16 PM   #6
Afflicted is offline Afflicted  Canada
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DJN, no time alignment ( don’t know if I would no how). John Meyer of Newform Research has made similar configurations with the ribbon placement. Seems to work just fine
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Old 4th November 2019, 07:20 PM   #7
6thplanet is offline 6thplanet  United States
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Dang, that's some real dedication. Good job
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Old 4th November 2019, 07:54 PM   #8
planet10 is offline planet10  Canada
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Concrete line arrays
I’ve long had thots about using the Newform Ribbons with some Accoustat panels for lower down.

They can be used as low as 1k can’t they?

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Old 4th November 2019, 08:18 PM   #9
adason is offline adason  United States
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Quote:
Originally Posted by Afflicted View Post
Well after 4 months of hard work, hard lessons and lots of skinned knuckles there finished. 650 lb monster line arrays
Why are they sideways?
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Old 4th November 2019, 08:26 PM   #10
Juhazi is offline Juhazi  Finland
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Originally Posted by adason View Post
Why are they sideways?
Canada?
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