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davey t
Young Croc Joined: 11 March 2004 Location: Bristol UK Status: Offline Points: 1428 |
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Posted: 23 March 2008 at 4:55pm |
Been working on this for a while and i finally finished a plan last week i was happy with. So we knocked up the first prototype and tested it.
Not sure if the world NEEDS annother bass bin design, but this one seems a goodun. I looked at all the other bandpass horns, especially fk1 and from past experience with the usb and dsub, i think i have a fair idea on what makes these things work and how to get them to play low. It was designed in CAD which was really good for making sure everything fits and calculating all the volumes. Its a single 18", 75x75x50cm box. The design principle is nothing new, its still a bandpass horn, but inside it doesn't look the same as any other i know of! here is a response plot... http://img119.imageshack.us/img119/8186/usb21w1mfi1.p BLue is USB2, yellow is a HD15. I'm not 100% sure about my SPL calibrations so thats why i put the hd15 in using the same gain settings etc to give a reference to get an idea of efficiency. They were measured in the middle of my garden with pink noise. 2.8v Av on my true rms meter with the mic 1m away. Next step is to build 4 and rinse them at a club. This is the real test! but it all looks really good so far.. Edited by davey t - 25 March 2008 at 9:37am |
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davey t
Young Croc Joined: 11 March 2004 Location: Bristol UK Status: Offline Points: 1428 |
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1w0m. the mic is right infront of the speaker in the middle of the horn mouth. Blue is USB2 again.. |
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da_audio_don
Registered User Joined: 24 November 2007 Location: United States Status: Offline Points: 90 |
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Was it an easy build?
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da_audio_don
Registered User Joined: 24 November 2007 Location: United States Status: Offline Points: 90 |
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your design looks like it would go pretty low in multiples. I look forward to hearing what you have to say about how a stack of four sounds like.
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Jhodas
Young Croc Joined: 04 June 2007 Location: United Kingdom Status: Offline Points: 1244 |
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+1 |
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Until the Lions have their own historians, tales of hunting will always glorify the hunter.
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Tekasis
Old Croc Joined: 03 July 2006 Status: Offline Points: 6492 |
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Never too much. Looking good.
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**Heavy Weight-Line**
A home without books is like a body with no soul. |
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james folkes
Old Croc Joined: 08 January 2005 Location: United Kingdom Status: Offline Points: 3064 |
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the world will always need new bass bins... keep 'em coming mr trotter, you're a machine! the curved mouth brace is a nice touch, makes them look a little different on the outside too. the plot is enviable, very solid to 40 in free space from such a tiny box, it's only a shade bigger than an f118 but looks a bit more real world friendly on its own. really well done, and keep us posted of course!
james. |
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mardy hippy.
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davey t
Young Croc Joined: 11 March 2004 Location: Bristol UK Status: Offline Points: 1428 |
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Easy build? Well, they're more complicated than original usbs, but i went for best sound and a slightly more complicated design. There are 3 of us building the prototype from scratch on friday n we did it in about 4-5 hours.
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Timebomb
Old Croc Joined: 11 October 2004 Location: Lancaster Status: Offline Points: 2716 |
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Like nice im liking the brace too, i take it from the cable hanging out the driver is reverse mounted?
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James Secker facebook.com/soundgearuk
James@soundgear.co.uk www.soundgear.co.uk |
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7810 |
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Are you planing to share the plans?
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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Tony Insanity
Registered User Joined: 06 January 2008 Location: United Kingkong Status: Offline Points: 236 |
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+1, got my saw & router at the ready and have nothing better to do!
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.....you might also look for her companion, a large Chinese rabbit, who is easy to spot since he is only standing on his hind feet in the shade of a cinnamon tree...
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mylesound
Registered User Joined: 08 August 2007 Status: Offline Points: 351 |
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if they go low in multiples id def. be intrested
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