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Internal baffle surface symmetry disruption?

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rosenkrux View Drop Down
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    Posted: 07 February 2017 at 9:52pm
Is disrupting the surface and symmetry of internal baffles worth while in trapezoidal ply cabinets?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 07 February 2017 at 11:23pm
Not really in my opinion, you'll get much more effective results by adding the right amount of damping material to them for your design.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rosenkrux Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2017 at 12:21am
All baffles are painted with bitumen but only up to about 1mm thick. Should I increase thickness? Cabinets are fairly rigid.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2017 at 12:25pm
It'll definitely add mass and dampen panel vibrations, might not be as effective as rockwool/polyester style stuffing at damping standing waves.

What's the cabinet? Impedance plots are easy to take and a strong tool for spotting resonances that could use more damping plus monitoring the relative effect of changes you make. Ultimately your ears will tell you too.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rosenkrux Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2017 at 2:19pm
22mm birch ply front n rears. 12mm sides. Narrow trapezoidal column speakers each with 6 full range drivers. Have polyester stuffing and a box of adhesive bitumen tiles that I'm dithering on adding.
Had been told asymmetrical tiling of baffles was advantageous. This is first set of speakers I've tried to build and ain't expecting miracles but hoping to pick up as many tips as possible for future projects.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote infrasound Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2017 at 5:22pm
Internal cross bracing best - Opposing forces cancel out for additional stiffness. Also breaks up standing waves if block enough area (must not block too much or impedance differences between chambers causes issues)

Mass is good to lower panel resonances and increase damping. Bitumen is no help unless used as constrained layer damping. Better to swap for airborne damping (ie, rock wool)

Trapezoidal only helps if all the above are done, effects are very minimal at this point and difficult to measure.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote infrasound Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2017 at 5:24pm




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Post Options Post Options   Thanks (0) Thanks(0)   Quote Father-Francis Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2017 at 6:03pm
That's nice work boss .
Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote infrasound Quote  Post ReplyReply Direct Link To This Post Posted: 08 February 2017 at 7:42pm
I can take no credit unfortunately, they are just good examples off the internet !
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