High Efficiency Speaker Asylum

Need speakers that can rock with just one watt? You found da place.

Return to High Efficiency Speaker Asylum

open baffle question

122.111.15.102
Posted on October 27, 2009 at 01:44:49
tubebuilder
 Gday inmates. If you can check this link out please of a interesting open baffle. Iam currious if the cut out on the front of the 201 acually loads the driver in any way or is it for show. I have seen this done before. Note how small the baffle is and that the baffle is spaced of the floor. I have been been building ob for a few years now and have learned that I need to learn more. Thinking about trying this.

3 things, posted on October 27, 2009 at 08:10:35
badman
Reviewer

Posts: 2479
Location: Tustin, CA (Orange County)
Joined: March 10, 2001
 1) Protect the driver
2) Look nice
3) SLIGHTLY strengthen the baffle


On the downside, there will be a little resonance and diffraction at high frequencies. Not such a biggie, in this particular design, but present and probably audible.



Bass is supposed to sound big. 6.5" is not a woofer size.


imho show, posted on October 27, 2009 at 02:14:50
Duke
Dealer

Posts: 3798
Location: Southern Idaho
Joined: March 31, 2000
Contributor
  Since: October 6, 2005
 The vertical pieces are too small (and the openings too big) to have any effect except at very high frequencies, where they'd cause a very early reflection that would smear things a bit.

Duke

Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
RE: imho show, posted on October 27, 2009 at 03:04:55
tube builder
 I cant understand why they would bother if it makes it sound worse. Its a very complex baffle. Perhaps its just for protection.

RE: imho show, posted on October 27, 2009 at 08:47:27
Paul Joppa
Industry Professional

Posts: 5028
Location: Seattle, WA
Joined: April 23, 2001
Contributor
  Since: July 1, 1999
 It's a beautiful piece of woodworking art. That's a perfectly good reason to "...bother [even] if it makes it sound worse".

RE: imho show, posted on October 27, 2009 at 18:11:24
electrovice
Audiophile

Posts: 590
Location: Washington State
Joined: September 3, 2002
Contributor
  Since: March 7, 2004
 Hi Paul

I agree it is a nice bit of woodworking.

The Goodmans driver is designed for rear mounting on a baffle, at least the ones I have are. It looks like the outside diameter of the cutout is beveled rather than cut at a sharp 90 degree angle. If it were beveled all the way around, there would be a lack of material to securely receive the screws holding the driver in place. I suspect that the design was a clever way of allowing the driver to be attached securely.

My Goodmans have centrally mounted tweeter horns. I suspect the design would compromise the high frequencies. It might still be worth trying.

John

RE: imho show, posted on October 27, 2009 at 21:31:18
Paul Joppa
Industry Professional

Posts: 5028
Location: Seattle, WA
Joined: April 23, 2001
Contributor
  Since: July 1, 1999
 Good observation! Thanks, I had completely failed to think of the rear mounting. There will be resonances in a cylindrical cutout, even if the diameter is more than 10 times the depth. Those vertical bars might well break up those resonances, or re-distribute them in a more random (and less noticeable) way.

RE: imho show, posted on October 27, 2009 at 18:18:28
electrovice
Audiophile

Posts: 590
Location: Washington State
Joined: September 3, 2002
Contributor
  Since: March 7, 2004
 The feet that raise the baffle off from the floor do not seem to have the same finish as the rest of the baffle. I wonder if they are an after thought to raise the driver height or stabilize the baffle.
John

RE: imho show, posted on October 28, 2009 at 09:52:38
tube builder
 Electrovice they did say somthing about setting driver height in the text.

Struts and resonance defusion is a cool idea. I am having fun with this project already. Or maybe a few :) I have lots of ideas for driver mounting. I think I will try a few I havent tried yet including some sort of rubber isolation mounting(Like german radio) and subpanel isolation mounting. I will report back if anyone is interested in this idea.

RE: imho show, posted on October 27, 2009 at 16:42:36
tube builder
 Yes it is nice. I am tempted to try somthing like it. It did stress in the text that natural timber is the key. All my ob's to date have had some coloration of there own. I have not tried klangfilm style ply on welded metal contruction yet eather.

RE: imho show, posted on October 27, 2009 at 03:16:48
tube builder
 Perhaps it is just to increase baffle strength. Babblefishing the text didnt help much.

RE: imho show, posted on October 28, 2009 at 19:26:42
wdh.co
Audiophile

Posts: 72
Location: NE England
Joined: January 4, 2003
 I think its a low table thats been coverted into a OB

15"Beta-A with German fied coils and wings using piano hinges.
Photobucket
RE: imho show, posted on November 1, 2009 at 17:33:32
c3conv2
 Hi,
Impressed with your open baffle!! Very Nice. Any pics or drawings on how the two wings were attached?

RE: imho show, posted on October 29, 2009 at 04:33:03
tubebuilder
 Sweet Yes I like field coils but cant really afford them. I am working on a similar baffle at the moment. I all so finished a baffle today. By modding as set of 70's coral boxes to sit on a reflex loaded richard allen woofer underneath in my bedroom(small). I milled out 3 large square cut outs. One being on top of the box too. I tried some vintage audax in them to start. The top cut out was to much for bass. So I blocked it and got some bottom end. I was just trying them fullrange. They where really nice. I guess there a open back open baffle. I will start on the tricky baffle plates for some german paper cones tomorrow.:)

Page processed in 0.045 seconds.

[ Top Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2009, Audio Asylum, all rights reserved ] [ Go Green ] [ Take5 ]
[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]