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Member
Owen Horns - my DIY Dec 27, 2022 23:53:31 GMT 12
- Edited Jan 31, 2023 22:53:58 GMT 12 by itisonlyme
Post by itisonlyme on Dec 27, 2022 23:53:31 GMT 12
Was doing some filling and came across this photo of my O-Horns. I think these were 3 of 3 Owen made.
His write up here; darklanternforowen.wordpress.com/2014/04/13/tractrix-midrange-horn/ Attachments:
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Post by jerm on Jan 23, 2023 20:14:38 GMT 12
Wow those look pretty cool. How did you build the enclosures on the back? Veneered yourself?
Did you run them with a woofer? I always assumed there were only two pairs ever made Dad had one pair and another was sent to his friend Mark in South Africa. I was recently told by RaveyDave there was another pair in NZ, I'm guessing these are them? Jeremy 
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Post by itisonlyme on Jan 24, 2023 23:05:36 GMT 12Did you run them with a woofer? I always assumed there were only two pairs ever made Dad had one pair and another was sent to his friend Mark in South Africa. I was recently told by RaveyDave there was another pair in NZ, I'm guessing these are them? Jeremy Don't you remember when I came round to pick them up???  You were just a cute little fulla then - sounds a bit weird when i say that now  Your dad came round to listen to them a couple to hear the different drivers I was trying out. The last time, after he left I noticed he hadn't drunk his red wine. I realised I had served basically vinegar! So gracious he never said a word :-) I was so embarrassed tho. I still cringe thinking about it. Thanks for your comment. Yes it's real veneer.Cost quite a packet. Imported the glue from the US. Bought a Japanese veneer hand saw . Obsessed much? The back enclosures are made from 3 layers of bending ply 'laminated' together. I found an amazing cool bit of free software that generates the pattern for any cone / truncated cone that you input. I roll-feed plotted a full scale pattern, with 3 slightly different sizes to account for the increasing thickness. Look good from a metre or so. Good for DIY but nothing like the beautiful perfection of your work - nor the sheer artisan skills of your dad. I massively admired the elegance and skill of his creations . Was it a pre-amp he made out of recycled shelves from the neighbour, tubes out the top? So cool! His bread board skills were amazing too. I ran the horns with some Magellan subs - which were 'fast'- people liked them with quad panels etc - but were too small for my latest room. So I bought some BD Design (Oris Horn) bass drivers and intended to build one of Berts many designs. Drew up a few options for designs, built some test boxes based of a design an acquaintance calculated for me. But ultimately never committed and finished. Most recently I decided to build some open baffle servo subs... then covid... and no supply avial. Grrr... bought some MBLs! They will looking for a good home in near future. A friend in ChCh is interested... but these are just too heavy ...does everyone who builds speakers for the first time overdo it and build impractically heavy designs? I'm sure I not the first! Tim
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Post by RdM on Jan 25, 2023 21:33:06 GMT 12Tim Hi Tim;- I'd like to know what that free software was. I remember writing a Basic program on an XT inputting into a green screen the results for altering dimensions of a truncated pyramid, interested in fitting Wharfedale 510.2 drivers into like Lambert Timekeeper cabinets. No progress after that, but I still have the drivers and crossovers for them. One day I'll be cutting plywood for cabinets, I still like the metronome shape. (A world away from horns, I'm sorry! ;=})) I also remember free software for calculating the ellipsoid cut to join two tubes at any angle, originally for bicycles, but I was thinking Formatube cylinders cut at an angle near the top, for speakers, that long time ago too. Kind regards, cheers!! Ross
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Post by itisonlyme on Jan 30, 2023 22:36:05 GMT 12
Hi Ross,
sorry, I thought I replied, but it was late at night, and I may have fallen asleep on the keyboard! I honestly can't recall the software - it was long ago, and many computers have come and gone since then. I recall being amazed that this free download did exactly what I was looking for! Green screens - that made me laugh! Metronome shape speakers... sounds cool. I hope you get back into that. I have slowed on the DIY big time. But I have a bass kit-set project and I was thinking to add a few crazy angles - to match the aesthetic of my main speakers. I'll just have to be careful not to destroy the principles of the design in the process! with regard to cutting ply, and having never owned a table saw - I have recently 'discovered' track saws! no more endless measuring and clamping guides for a circ saw just to make one cut.
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Connoisseur
Owen Horns - my DIY Mar 18, 2023 23:30:11 GMT 12
- Edited Mar 19, 2023 0:03:44 GMT 12 by RdM
papahemi likes this Post by RdM on Mar 18, 2023 23:30:11 GMT 12Metronome shape speakers... sounds cool. I hope you get back into that. I have slowed on the DIY big time. But I have a bass kit-set project and I was thinking to add a few crazy angles - to match the aesthetic of my main speakers. I'll just have to be careful not to destroy the principles of the design in the process! with regard to cutting ply, and having never owned a table saw - I have recently 'discovered' track saws! no more endless measuring and clamping guides for a circ saw just to make one cut. Late to answer this, I apologise ;=}) Back in the early-mid '90's I liked the Lambert Timekeeper shapes, had access to a copier at work, made a literal cut and paste over several scans to get an image of the 510.2 drivers in that shaped cabinet. A grayscale scan of the single remaining yellowed paper evidence of that below. I have the drivers & crossovers only, so am free to choose a cabinet shape. That was then. I'd likely round the corners now. Reduced baffle width might affect midrange. Just an old idea.   As for saws, I looked up those track ones! (But I'll likely carry on without ... until maybe I remember this again! ;-)) I've always used clamped down guide rails, whatever to hand that's stiff and sturdy enough, for smallish jobs with a skill-saw hand held. Vertical shelf brackets, or other saved lengths of strong metal or wood to hand etc. But I want to restore this old table saw, a cute smallish table that can be wound to tilt to 45 degrees, with the fence supporting the wood. It works, but needs particle blasting de-rusting, and I will repaint the painted edges. It's as old as I am - Made in Penrose Auckland 1952. That'll have to be a separate thread! ;=})
1,287 posts |
Post by itisonlyme on Mar 20, 2023 18:28:37 GMT 12with regard to cutting ply, and having never owned a table saw - I have recently 'discovered' track saws! no more endless measuring and clamping guides for a circ saw just to make one cut. Late to answer this, I apologise ;=}) Back in the early-mid '90's I liked the Lambert Timekeeper shapes, had access to a copier at work, made a literal cut and paste over several scans to get an image of the 510.2 drivers in that shaped cabinet. A grayscale scan of the single remaining yellowed paper evidence of that below. I have the drivers & crossovers only, so am free to choose a cabinet shape. That was then. I'd likely round the corners now. Reduced baffle width might affect midrange. Just an old idea. As for saws, I looked up those track ones! (But I'll likely carry on without ... until maybe I remember this again! ;-)) I've always used clamped down guide rails, whatever to hand that's stiff and sturdy enough, for smallish jobs with a skill-saw hand held. Vertical shelf brackets, or other saved lengths of strong metal or wood to hand etc. But I want to restore this old table saw, a cute smallish table that can be wound to tilt to 45 degrees, with the fence supporting the wood. It works, but needs particle blasting de-rusting, and I will repaint the painted edges. It's as old as I am - Made in Penrose Auckland 1952. That'll have to be a separate thread! ;=}) I hope you don't take this the wrong way, but that is hilarious. How easy that has become now. Of course physical cut and paste/ trace still has it's place. Clamping guiderails... me too. PITA. I bought a secondhand track saw. PM me if you want to borrow it. t.
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