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Old 23rd January 2013, 06:22 AM   #1
xrk971 is online now xrk971  United States
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Default Specimen Gramophone style Horn Speakers

This was originally in the Foam Core thread but I thought it was of more general interest to the Full-Range forum.

I ran across these Specimen back loaded horn speakers that resemble the old style gramophones player horns. They make them out of recycled newspaper and glue mixed with dryer lint for a matrix. Instead of newspaper foam core is perfect for this, and instead of glue and lint, hot melt.

Click the image to open in full size.

This looks very interesting and would be a unique conversation piece more than anything. The bent shape of the 8 petals is critical to making the horn bend forward like that.

This may be one of my next projects. Has anyone here listened to one of these in person? They are in Chicago area. Alright, who's in on this one with me? We need to develop those patterns. You can see the one photo where they are hung out like laundry. There are 4 unique shapes. These would be ideal to make out of foam core as it can be curved at will.

Specimen's Hand-Crafted Horn Speakers Are Made from Recycled Newsprint and Dryer Lint | Inhabitat - Sustainable Design Innovation, Eco Architecture, Green Building
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Old 25th January 2013, 12:30 AM   #2
xrk971 is online now xrk971  United States
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OK, it's been a few days since I posted this - so no interest from anyone in building these to see what they sound like? A simpler horn can be made using 4 walls of curved foam core. I am also thinking of this as a good opportunity to try multiple lengths of horns to see if it can smooth the response.
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Old 25th January 2013, 12:50 AM   #3
sreten is offline sreten  United Kingdom
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Hi,

They are awful, pretentious artifice, AFAICT.

rgds, sreten.
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Last edited by sreten; 25th January 2013 at 12:53 AM.
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Old 25th January 2013, 12:54 AM   #4
xrk971 is online now xrk971  United States
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Sreten.
Have you actually listened to these or are your opinions based on fact that it looks like a horn from a Thomas Edison era gramophone horn? I would size the horn using sims rather than just to look like the one in the picture.
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Old 25th January 2013, 12:55 AM   #5
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I'll agree with sreten on that. In essence a BVR.

Making a petal front horn with helper woofer would be a more worthwhile application of the effort.

dave
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Old 25th January 2013, 01:04 AM   #6
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OK, so it sounds like you guys think this Gramophone horn is a waste of time. Not sure why this is more of a BVR than a BLH because that little box is the driver chamber, there is a throat and there is a horn. Classic BLH, it just doesn't look like a rectangular box.
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Old 25th January 2013, 01:16 AM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by xrk971 View Post
Sreten.
Have you actually listened to these or are your opinions based on fact that it looks like a horn from a Thomas Edison era gramophone horn? I would size the horn using sims rather than just to look like the one in the picture.

Hi,

Of course I haven't listened to them, that goes without saying on
nearly all my "opinions" on poor designs posted on this forum.
You can take or leave my "opinion" that they are awful.

Your going to build something similar but with proper simulation ?
You think you'll end up with something similar ? I don't think so.

Speaking of sims I've been looking at this recently which is interesting :
http://www.quarter-wave.com/Horns/BL...gn_Article.pdf

rgds, sreten.
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Old 25th January 2013, 01:24 AM   #8
xrk971 is online now xrk971  United States
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Sreten,
Ha ha! "Of course I haven't listened to them..." Of course I would sim first, I don't waste my time on building stuff on a whim anymore. You are right though, the design would be different and sound different.

The MJK paper you refer to is one I have been reading already and it the topic of the thread MJK's Fostex FF125wk BLH project Check it out, Dr Boar has built, probably the first example of the BLH described by MJK in this paper and is performing numerous measurements of the performance.
Regards,
X
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