Speaker Grill Frames - Shapes - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th July 2009, 07:43 PM   #1
diyAudio Member
 
Join Date: Jun 2007
Default Speaker Grill Frames - Shapes

I've often wondered about this. We seem to make great strides in speaker cabinet design, but stick to the same old tried and dis-proven designs for Grill Cloth Frames. See attached diagram.

I suspect for many of us, our first speaker grill looked something like 'A'. We simply took some left over boards, and made a rectangular frame.

Later we moved to type 'B' thinking the soft curved edges made it aesthetically more pleasing. But really would type 'C' with the quarter round to the inside make the transition of moving air less of a problem?

And, though not shown, wouldn't the use of half-round rather than quarter round be better still?

And would a picture frame type molding as seen in diagram 'D' be better for all, with a soft smooth rounded transition to the outer edge followed by a soft rounded transition on the outer edge? Wouldn't this ease the transition of moving air across that boundary.

Diagram 'E' is my crude attempt to draw an idea I had where the removable frame the holds the grill cloth (squares in corners) was actually flush with the front, and some perforated metal or plastic was formed into an arch to hold the cloth away from the baffle. The perforated metal (or plastic) would not run the full length, it would be placed at the top and bottom, and perhaps in the middle, away from blocking any speaker, just to hold the cloth away from the front.

With all the woodworking and speaker building skill and experience in this group, I'm amazed that someone hasn't come up with a better way of making grill frame, especially when we know there is a problem with edge defraction when the sound passes over a sharp edge.

I suppose one solution, and probably the best solution, is to not use grill cloth or grill frames, but in a world full of dogs, cats, kids, and wives, is that really a practical solution?

So, I'm curious whether anyone has tried any innovative grill frame designs, and curious how they were to build, and how the final result worked.

Steve/bluewizard
Click the image to open in full size.
  Reply With Quote
Old 12th July 2009, 09:57 PM   #2
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
These are like your D version. The picture doesn't do them justice unless you look in the dark areas on the side where you can see it a little better. The cut out is peanut shaped to wrap around the drivers laid out d'Appolito style.
Attached Images
File Type: jpg img_8698.jpg (50.3 KB, 208 views)
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 12th July 2009, 10:04 PM   #3
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
You kind of see it here. I didn't do much of a roundover on the outside edge though.

EDIT: Now that I look again, I guess they are half way between C and D.
Attached Images
File Type: jpg img_6376.jpg (42.2 KB, 184 views)
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 12th July 2009, 11:30 PM   #4
diyAudio Member
 
Join Date: Jun 2007
In a sense, 'C' and 'D' almost create something of a horn effect; gently, hopefully, unloading the sound.

But I wonder if the sound passing over the crest of the curve in the 'D' model doesn't see that crest the same as a sharp edge?

Again, I'm just wondering why, when we know the 'B' version has real drawbacks, no one has come up with something better.

People strive to great lengths, rounding, recessing, and beveling, to make the cabinets sound right, only to compromise all that work by adding type-B speaker grills?

I have a pair of JBL towers that use a one piece molded plastic grills that have something of a diamond pattern to them. The advantages are that the edges of the frame are very narrow, but they are also very sharp. Also, all those criss-crossing diamond shapes are all sharp edges.

One drawback to the Type-D is that it might encroach into the space of the woofers. People are making cabinet fronts narrower and narrower. Still a person could so something like you did and cut into the 'picture frame' to make room, the soften the edges by smoothing, beveling, and rounding them.

Unless I am mistaken the edge diffraction is more of a high frequency problem.

Just curious.

Steve/bluewizard
  Reply With Quote
Old 13th July 2009, 12:20 AM   #5
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
I did mine because I didn't rebate the drivers.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Speaker grill/cover and grill fastener questions. marchel Multi-Way 4 22nd January 2008 01:41 PM
How does linkwitz count baffle width for h-frames and u-frames thadman Multi-Way 4 16th July 2007 01:40 AM
Different speaker shapes Johnny25 Full Range 16 10th February 2006 03:29 PM
Square rooms and ideal speaker shapes robem Multi-Way 1 12th December 2004 10:22 PM
researching diy speaker shapes? Austin Multi-Way 6 9th July 2002 03:06 PM


New To Site? Need Help?

All times are GMT. The time now is 05:04 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2