After a fair bit of deliberation, prompted by the 'Best Back Loaded Horn' thread;
http://www.diyaudio.com/forums/full-range/296139-best-back-loaded-horns.html
I've decided to plan/progress a build of Ketil Parow's Big Fun BLH for my next/last speaker project. I love my current All Fun horns and the only criticism I could level at them is that the bass can be a little light on occasions; I think the Big Funs will keep what I like but add some more weight/extension in the bass. The Big Funs will also mean that I can keep my Lowther EX4 units, keeping costs contained to some degree.
I'll use the plans that were published on the Lowther America site a few years ago. Initial thoughts were to round off the profile but I have decided to keep to the original flat panel folding following comments I've seen (I think it was Scottmoose) that a smoothed profile can compromise the LP filter aspects of BLHs.
As the Big Funs will likely be my last speaker project I want to optimise the build and wanted to float some ideas for the build and invite comment/observations.
1. To damp the large side panels I'm thinking of making them 'hollow' (two 12mm birch ply skins sandwiching a matrix of 12mm wood slats) and filling the void with sand.
2. As the mouth of the Big Fun is so large I'm thinking of drilling holes either on each side and using some threaded rod to brace the panels against each other (i.e. use nuts on either end of the threaded rod to tension it).
3. Adding deflectors to the mouth as per the All Fun horn;
http://www.parow.no/Lowther/ALLFUN/Size.html
I'll fire up AutoCAD this week and start to work on some drawings for CNC'ing the panels.
Cheers
Ray
http://www.diyaudio.com/forums/full-range/296139-best-back-loaded-horns.html
I've decided to plan/progress a build of Ketil Parow's Big Fun BLH for my next/last speaker project. I love my current All Fun horns and the only criticism I could level at them is that the bass can be a little light on occasions; I think the Big Funs will keep what I like but add some more weight/extension in the bass. The Big Funs will also mean that I can keep my Lowther EX4 units, keeping costs contained to some degree.
I'll use the plans that were published on the Lowther America site a few years ago. Initial thoughts were to round off the profile but I have decided to keep to the original flat panel folding following comments I've seen (I think it was Scottmoose) that a smoothed profile can compromise the LP filter aspects of BLHs.
As the Big Funs will likely be my last speaker project I want to optimise the build and wanted to float some ideas for the build and invite comment/observations.
1. To damp the large side panels I'm thinking of making them 'hollow' (two 12mm birch ply skins sandwiching a matrix of 12mm wood slats) and filling the void with sand.
2. As the mouth of the Big Fun is so large I'm thinking of drilling holes either on each side and using some threaded rod to brace the panels against each other (i.e. use nuts on either end of the threaded rod to tension it).
3. Adding deflectors to the mouth as per the All Fun horn;
http://www.parow.no/Lowther/ALLFUN/Size.html
I'll fire up AutoCAD this week and start to work on some drawings for CNC'ing the panels.
Cheers
Ray
Notice to Moderator
How embarrassing - I just realised that I started a similar thread a while back so I'll resurrect it to avoid wasting people's time. Perhaps you get an inkling of why this will be my last speaker project!
Perhaps a moderator could remove this thread.
Thanks
Ray
How embarrassing - I just realised that I started a similar thread a while back so I'll resurrect it to avoid wasting people's time. Perhaps you get an inkling of why this will be my last speaker project!
Perhaps a moderator could remove this thread.
Thanks
Ray
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