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Cool. I have about six pairs of LS3/5a's. I may be able to offer the odd bit of advice, but I've never built a pair myself.
Hey Mr Rodabod, I've now got a pair too. Whahey, finished making them yesterday. Turned out great, plus I taught myself how to Veneer at the same time. Real Teak, 2 coats of Dark Oak flavoured bees Wax, lorra lorra work.

Yummy.

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Bike cams need to come with polarisation filters as standard so you can see through the car windows.
...an' a large magnet too. That way if the car bashs into a bike fitted with a 'Magno-Cam' (TM'd 2 mins ago) fitted the car wont be able to drive away cos the Magnet will hold the car to the bike cos thats what Magnnitts do innit. Flippin' jeanius idea IMO.
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The frugalhorns, so that is just one big baffle angled inside the cabinet, rather than a transmission pathway? Also do you line the cabs with any deadening material?
Yup, just one angled part thats sealed at the bottom of the internal 'pointy bit' of the horn. There's long discussuins about horn stuffing and damping over on DIY Audio, the FH3's have their own website if you want to read more about them and build a pair.
http://www.frugal-horn.com/index.html
I'd love a workshop where I can build increasingly more bonkers stuff too. My workplace 'workshop' isn't equipped for speaker making unfortunately, its geared up for Electronic equipment repairs to support Science at the place where I work, I'm an Electronics Tech by trade . At home I've got a shed though, thats where I convert the expensive sheets of plywood into dust for fun.
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Yes PLS!
Here y'go, these are FrugalHorn 3's. These are my main system listening speakers at the moment. Not as dynamic as the big Saburo's but still very very good (IMO), smoother and more 'hifi' perhaps. They look easy to build but there's some trixy bits going on.



Under the appalling (my fault) wax finish is probably the most accurate woodwork I've ever done...

Others I've made are this pair of near-field FE127 (Fostex again I know) Fonkens...


And before them I made FE167 MLTL's...

And later for our Workshop Sound system I made...

which hang and fire down our workshop like this...

and were driven by this until the mains TX went pop..

I think we reached the ultimate workshop system when I started running Logitech Media player on a PC fed FLAC files from a ext HD into an I2S DAC feeding the Valve amp into them workshop speakers.
Lotta folk used to pop in just to listen :)
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They're a very different 'listen' to your much-beluvved LS3/5a's Rod but equally valid. They don't do super high or super low (even in a mahoosive cab) but as TRA suggests they do do something very special. A friend of mine loves Lowthers drivers, he was exposed to them early on in his life, often they're found in some behemoth corner horn from the 50's or some bizzare structure like this...

...and I only 'sorta' get them.Single driver stuff isn't for everyone.
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Agreed, there's summat special about drivers around this size IMO. I have FE167's here at working in the workshop sound system cab's and they're fun too but a gimmie a good tiddler, cor! (sniggers).
I can't do the maths I'm afraid TRA, I copied the plans from the box plan library that was on DIY Audio and the Canadian Planet 10 websites. I'm OK at building speakers but designing them is a skill I lack. I've met the fella who designed the big cabs quite a few times, he's a clever 'un, Scott Lindgren.
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Nah, they're a Single Driver running FR in each cabinet Rod, no tweeter, no Xover. Maximum Phwwoooaar! The piccie of the 4 drivers above show 2 different tweaked variants of old FE126's.
I built a pair of FrugalHorn 3's to use up the 2nd pair, you and TRA seen them? A smaller but very good FR cab again. Want pics?
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Bluddy terrible.
Arf! They're the most bouncy dynamic Speaker I've ever owned/had in my house. I've transported them to various places to listen to them with other like-minded shed-bound sawdust junkies and in large rooms with solid floors they can sound awethumne (IMO). They're very very fast in the bass due to the saucy 4" driver with not too much mass to shift I'd imagine, the magnet is almost as large as the cone area on these. They're not perfect, there is a horn 'sound' which is Marmite to many. Personally I love 'em, however... since a room reshuffle at home resulting in a lowered ceiling height they don't live in the Lounge anymore, I have them in a smallish 'workroom'/guest bedroom where they function as the worlds largest pair of headphones, the closer you sit to them the more the port output dominates but its a very big (no kidding) 'sound' and the sound-staging is amazing on them. I treated them to some uber-tweaked drivers a while back.

Magnets. I know they get the blame for a lot of stuff on this forum but really.... 'magnets'!

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6 pairs, kerrrrrikey you need help! :) I'm available....!
Ta for the offer of advice Mr Abod. I've actually purchased an entire kit to do it from Falcon Acoustics who are one of the current License holders I believe. Not cheap but I've wanted a pair since I spent 4 1/2 years listening to them everyday whilst working in a TV/AV workshop in Camberwell/Brixton in the late 80's early 90's. Powered by a Mission Cyrus IIRC, loved the sound in that little workshop. At roughly the same time and for 19 years I lived with a pair of Rogers Studio 1a's before I discovered what Full range (sorta!) single drivers in horns could do on the end of Single-ended Valve amps and sold the Rogers to fund a DIY horn build. The new listening room at home (long-suffering partner insists on referring to it as 'our-conservatory-dear'...Pffftttt!) is gagging for pair of monitor's as we sit very close to the listening position (oops I mean comfy sofa looking down the garden).
Complex Xover is back to 15R again as they're sourcing hand build rep's of T27's and B110's. Details if you're the inquisitive type here -> http://www.falconacoustics.co.uk/ls3-5a/ls3-5a-b110-t27-cabinet-kit-complete.html


Yeah, not arf! And just I remembered them actually from the early 90's, very 'Beeb', tight, dry, image monsters and the bass hump too!