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new BMS reflex sub
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csg View Drop Down
Old Croc
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Joined: 17 September 2007
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    Posted: 11 January 2012 at 8:08pm
Ive been working on some new subs to go with my twin 10 + 1" tops, as detailed on the other thread

BMS 18S430V2 loaded, courtesy of our Tony Wilkes

Net 150L internal ( allowing for bracing / handles / driver displacement), tuned to 41.5Hz, F3 is simming and measuring at more or less bang on 40Hz


sounding very good - ive tried a couple of different volumes and tunings, but im going with this one. Very musical sound, good depth and very good transient response.

Just about to start on 8 birch ones!
www.impulseaudio.co.uk
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luton_soundman View Drop Down
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Points: 2358 		Post Options Post Options   Thanks (0) Thanks(0)   Quote luton_soundman Quote  Post ReplyReply Direct Link To This Post Posted: 11 January 2012 at 8:14pm
looks good, will have to have a listen when i pick up those drivers, also get to hear the Lab Cool
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Points: 1342 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JohnnyPyro Quote  Post ReplyReply Direct Link To This Post Posted: 11 January 2012 at 8:27pm
Thats an awsome looking sub .. how do you go about designing the corner vents? i was told it is a bit of a tricky affair?
Pyrotechnics... its not rocket science, well.... actually it is !! :o)
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Originally posted by JohnnyPyro JohnnyPyro wrote:

Thats an awsome looking sub .. how do you go about designing the corner vents? i was told it is a bit of a tricky affair?


Hard to simulate accurately, so more testing needed. Thumbs Up

Very nice work btw. Good to see frontal area minimised! Star
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Old Croc
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Points: 3530 		Post Options Post Options   Thanks (0) Thanks(0)   Quote csg Quote  Post ReplyReply Direct Link To This Post Posted: 11 January 2012 at 8:43pm
yes, as said above, i sim using the cross section divided into 4, take 10% off the port length, then build, tune, fiddle, fiddle, fiddle...

in the end, its my ears and my NTI analyser which decides, not the computer.

Its not the smallest single 18 around by a long way, but it was sounding very neutral and flat, and not struggling with the bottom end of some d&b and dubstep tracks i know well
www.impulseaudio.co.uk
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ceharden View Drop Down
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Points: 8370 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 12 January 2012 at 12:10am
The main answer regarding ports in general is that after you've designed a few, you get the hang of the 'fudge factors' required to convert a simulated tuning to real ports.

That and of course a bit of guesswork followed by trial and error as described above!
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Edd Jordan View Drop Down
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Points: 783 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Edd Jordan Quote  Post ReplyReply Direct Link To This Post Posted: 12 January 2012 at 1:20am
Im loving that sub! great work! cant wait to see all 8!
I do a sideline in ply wood wheels.
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Tony Wilkes View Drop Down
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Points: 3367 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Wilkes Quote  Post ReplyReply Direct Link To This Post Posted: 12 January 2012 at 9:51am
Chris,  Bloody hell mate that was quick, when it is run in it will get even more musical and a give bit more output. Give me a shout when they are in action for the first time in anger, would like a listen and gander, looking good so far.

Tony


Edited by Tony Wilkes - 12 January 2012 at 9:51am
www.forteaudio.eu - BMS - db-Mark Processors
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4AC View Drop Down
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Points: 242 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 4AC Quote  Post ReplyReply Direct Link To This Post Posted: 12 January 2012 at 1:57pm
Nice! Lovely Lab as well.

But, no handles?

Teun
Sound quality to the people
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Edd Jordan View Drop Down
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Points: 783 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Edd Jordan Quote  Post ReplyReply Direct Link To This Post Posted: 12 January 2012 at 2:18pm
i think thats just the test cab 
I do a sideline in ply wood wheels.
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csg View Drop Down
Old Croc
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Points: 3530 		Post Options Post Options   Thanks (0) Thanks(0)   Quote csg Quote  Post ReplyReply Direct Link To This Post Posted: 12 January 2012 at 2:28pm
yes, just a test cab, so thats why its butt jointed in MDF, the proper ones will be in rebated birch, with handles etc
www.impulseaudio.co.uk
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supremesoundz View Drop Down
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Clap very nice
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