Anyone built the Decca Corner Horn (TQWP)? - Page 4 - diyAudio
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Old 3rd September 2012, 12:55 PM   #31
DrBoar is offline DrBoar  Sweden
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I have published the Decca Corner horn and the Tri Column design as published in HFN&RR. A good start would be drawings of cabinets and impedance curves/Frequency ditos. The Decca 12" is something that I would like to see.

In Denmark they even have a forum for vintageDIY
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Old 3rd September 2012, 03:34 PM   #32
dai is offline dai  Wales
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Default decca corner horn?

hi devilsinthedetail
I have attempted to download the relavant drawings of the four
speakers it was quite a convoluted proceedure but here goes

regards richie
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Old 3rd September 2012, 06:56 PM   #33
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Cleaned up and pdfed archive of Richie's scans.

http://p10hifi.net/forum/hifiNews-anthology-extract.pdf

Pages 7, 10, 33, 38. and 55 (at a minimum) all look like they would be a welcome addition to this document.

dave
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Old 3rd September 2012, 07:45 PM   #34
DrBoar is offline DrBoar  Sweden
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Some construction notes on TriColumns
1. The baffle is simpler with modern fullrange drivers that are front mounted on the baffle.

Do not forget to recess the baffle if you want to have some cover on top...

2. Internal bracing and damping is needed

3. Using a elastic fabric sewn as a straight tube with a diameter slightly less than the tube makes an easy finish.


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Old 3rd September 2012, 08:11 PM   #35
dai is offline dai  Wales
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Hi dave
huge improvment on the drawings I will be quite happy to copy all of the book if
there is suficient interest I also have some of the Gilbert Briggs books which have
lots of information on cabinete and speaker design

richie
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Old 4th September 2012, 07:59 AM   #36
DrBoar is offline DrBoar  Sweden
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Decca Corner horn and Philips 9710 perhaps?

Thiele Small measured with Dayton Woofer Tester 3 (The other is similar)

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The lift above 2 kHz should work in this setting (XTZ Room Analyser II, on axis 70 cm on a 30x50 cm baffle)
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Old 6th February 2013, 03:35 PM   #37
DrBoar is offline DrBoar  Sweden
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I have started to plan a build of a the Decca Corner horn. I will not build in original state with 9mm plywood and no damping what so ever! 12mm MDF or 11 mm OSB laminated with damping material is more likely.

The taper of the pipe is a bit unusual to say the least. Any opinions of there would be something gained by trying to get a more conventional flare?

I would keep the cabinet as is but add pieces of light softboard to fill out the sections below the driver to get a more conventional flare.

The intended 8" drivers are at 200-220 cm2.
Cross section in cm2
Start: 297
At start of baffle board: 428
At lower edge of driver cutout: 336
At the top of the divider oposite the driver: 440
At the bottom end of divider: 660
Bottom: 957
Then the final opening is a constricted slotloading, that in UK has bottom of a wall to wall carpet that the feet has sunk into to some undefined degree.

My plan would be to have the opening facing the corner and be of 50-100% of the surface area of the driver.

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Old 6th February 2013, 04:45 PM   #38
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by dai View Post
Hi dave
huge improvment on the drawings I will be quite happy to copy all of the book if
there is suficient interest I also have some of the Gilbert Briggs books which have
lots of information on cabinete and speaker design

richie
+1 Interest. Please provide more
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