B2F |
Post Reply | Page 123 6> |
Author | |
snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
Post Options
Thanks(0)
Posted: 02 July 2020 at 1:56pm |
obviously I have taken inspiration from somewhere else but switched things round - hence B2F driver magnets don't actually touch because they are offset - one against the top of the cabinet, the other against the bottom so the vent clears the opposite magnet. for some neo drivers the magnets clear each other completely meaning very deep drivers can be used. rear chamber vents are optional - will design a plate to bolt over to close them off when not wanted. still working on access hatch(es) - will probably go for a well-braced wooden rear door with connector dish built into it. |
|
monkeypuzzle
Young Croc Joined: 25 January 2005 Status: Offline Points: 923 |
Post Options
Thanks(1)
|
Looks very interesting, rather than having a plate that covers the front ports as an optional, hows about a plate that is either blank or ported that swaps out in that front piece. This would allow access to do up those very hard to reach driver bolts.
|
|
blah blah blah blah blah......
|
|
madboffin
Old Croc Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1537 |
Post Options
Thanks(0)
|
I like that.
Go on then, take a leaf out of Doober's book and knock up a prototype! |
|
snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
Post Options
Thanks(0)
|
yeah might do that as it is going to be awkward. I'm going to make the whole baffle on which the driver is mounted removable, so I can put the mounting points where they are covenient to some degree.
|
|
snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
Post Options
Thanks(0)
|
I can get this driver to fit:
can't quite get this one to fit but it seems to have been taken off the BMS website anyway:
http://www.loudspeakerdatabase.com/BMS/15S430v%C2%B2 |
|
snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
Post Options
Thanks(0)
|
few more details left and then try to make a sensible cutlist Edited by snowflake - 08 July 2020 at 1:24pm |
|
odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
Post Options
Thanks(0)
|
Looks interesting, does resemble a certain design a little. How did you model it, port assisted FLH or variant on a bandpass horn?
|
|
snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
Post Options
Thanks(0)
|
modelled in hornresp as FLH with ported rear chamber and a path length difference
|
|
snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
Post Options
Thanks(0)
|
one thing I'm really not sure about is the braces in the mouth. I've drawn them at an angle between the sidewall and the opposite horn flare. but if you assume the wavefront travels down each wall of the speaker at the same speed and is perpendicular to each wall, then the wavefront must be slightly S shaped as it approaches the mouth and the braces are at the wrong angle to allow smooth airflow past them. might replace with 6mm steel bar to remove the issue completely. once it gets to the mouth the path length differences should give quite a nicely curved wavefront coming out the front of the box.
Edited by snowflake - 08 July 2020 at 7:04pm |
|
odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
Post Options
Thanks(0)
|
Or just grind down the rear flat to make a wedge if you were worried. You'd imagine it probably wouldn't make a noticeable difference given wavelengths involved, but who can say till it is tried.
|
|
snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
Post Options
Thanks(0)
|
I mean the wavefront must be something like this. so hitting that brace almost 90deg off from what you would want |
|
smoore
Young Croc Joined: 30 March 2011 Location: N.Devon Status: Offline Points: 937 |
Post Options
Thanks(0)
|
How do you add a path length difference in hornresp between port and horn?
|
|
Post Reply | Page 123 6> |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |