Anyone built the Decca Corner Horn (TQWP)? - Page 2 - diyAudio
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Old 17th February 2011, 09:13 PM   #11
tinitus is offline tinitus  Europe
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hey, DrBoar

sorry, but I had to remove the pictures

can I please ask you to resize them, or post as attachments


moderation
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Old 9th March 2011, 08:36 AM   #12
DrBoar is offline DrBoar  Sweden
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Here are the scans as attachments I did not find the attachment icon in (you can click the arrow next to the 'Attachment Icon' and select it from the list.) but I hope this will work
Attached Images
File Type: jpg DeccaHorn-1.JPG (334.2 KB, 395 views)
File Type: jpg DeccaHorn-2.JPG (301.8 KB, 343 views)
File Type: jpg DeccaHorn-3.JPG (404.8 KB, 346 views)
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Old 9th March 2011, 03:57 PM   #13
sreten is offline sreten  United Kingdom
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Hi,

The scans are unreadable.
Use the paperclip icon to add attachments :

Attachment Key

Filetype.Max Filesize.Max Width.Max Height
bmp......195.3 KB.....6200......2800
doc......195.3 KB......-.........-..
gif......195.3 KB.....6200......2800
jpe......195.3 KB.....6200......2800
jpeg.....195.3 KB.....6200......2800
jpg......976.6 KB.....6200......2800
pdf......195.3 KB......-.........-..
png......195.3 KB.....6200......2800
psd......195.3 KB......-.........-..
txt......195.3 KB......-.........-..
zip......976.6 KB......-.........-..



rgds, sreten.
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Old 9th March 2011, 04:31 PM   #14
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Quote:
Originally Posted by sreten View Post

Hi,

The scans are unreadable.
Use the paperclip icon to add attachments :

Attachment Key

Filetype.Max Filesize.Max Width.Max Height
bmp......195.3 KB.....6200......2800
doc......195.3 KB......-.........-..
gif......195.3 KB.....6200......2800
jpe......195.3 KB.....6200......2800
jpeg.....195.3 KB.....6200......2800
jpg......976.6 KB.....6200......2800
pdf......195.3 KB......-.........-..
png......195.3 KB.....6200......2800
psd......195.3 KB......-.........-..
txt......195.3 KB......-.........-..
zip......976.6 KB......-.........-..



rgds, sreten.
am I missing something.....they're perfectly readable from here, and a good read as well. Thanks for posting.

Ed
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Old 9th March 2011, 05:43 PM   #15
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No problems reading the scans at this end either.
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Old 10th March 2011, 07:28 AM   #16
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Default my head hurts

umkay, first look trying to grok and unclear at terminus.

Fig6A.

voight-ey expanding closed section one,
contracting section two to driver with ??? constriction,
back to voight-ey expanding section three,
then big step-expansion down to base where

???

happens.

a "port" sorta half the base open into a shelf-port formed by the two 1" high base rails (and exhausting to floor/wall boundary)? two little mass loads?

trying to wrap my head around what the front driver excites. Say the box bottom is sealed for this imaginary scenario. If the thing is pushed tight to a corner, it's almost an external horn with offset driver. Now, if the backwave radiation is coupled to it, too, well, my head hurts.

really grateful for the scans, btw, thanks! (the GA4 hifi amp has rotatable transformers for minimizing hum--sweet
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Old 10th March 2011, 07:33 AM   #17
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by vitalstates View Post
am I missing something.....they're perfectly readable from here, and a good read as well. Thanks for posting.

Ed
Quote:
Originally Posted by Scottmoose View Post
No problems reading the scans at this end either.

Hi,

I must be missing something, all I can seem to access is the thumbnails.

rgds, sreten.

Edit : I was missing something, you need to expand them before saving them .....
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Last edited by sreten; 10th March 2011 at 07:37 AM.
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Old 10th March 2011, 08:21 AM   #18
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Quote:
Originally Posted by grindstone View Post
umkay, first look trying to grok and unclear....
Driver faces a corner

maybe quick & nasty visualization will help

dave
Attached Images
File Type: gif DeccaHorn3d.gif (27.9 KB, 288 views)
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Old 10th March 2011, 09:57 AM   #19
sreten is offline sreten  United Kingdom
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Hi,

Having had a good look at the drawings, I can say they have been simplified
somewhat compared to the one I had, no doubt for ease of construction.
I recall the internal partition being more complicated, giving an overall
larger taper/expansion rate, this being built mainly in the angled section.
I did lug it around somewhat, no way was it all 3/8" ply (see previous).

Hi-Fi News and Record Review published a reworked version, using
a Richard Allen twincone I recall, perhaps someone can scan that ?
Not sure about the driver, not the CG8T I recall, was a low Qts version.

rgds, sreten.

A minor detail, think the back 1" should be 2 x feet, not a continuous strip.
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Last edited by sreten; 10th March 2011 at 10:03 AM.
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Old 10th March 2011, 06:18 PM   #20
DrBoar is offline DrBoar  Sweden
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I have a decca postscript were they state that readers have showed interest in using 12" drivers and that even if HFN thought that the 8" was better they would later publish a 12" version.
The end of the pipe is a mess were the effective area is affected by the feet sinking into the carpet if any...

I would rather use a solid floor in the cabinet, a corner reflector towards the front and the vent opening at the lower end of the 10" by 26" piece
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