BroadBand Bass Trap's Build - Page 10 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #91 of 175 Old 03-01-09, 12:02 PM
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Re: BroadBand Bass Trap's Build

That's great, Jason! Anything that gets him interacting with the outside world is fantastic. And that's a great shot that I'm betting you'll cherish years from now as well.

I'm not scared of the motorcycles, really I love them, and I wish I could afford to ride on the track where my only worst enemy would be me! LOL
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post #92 of 175 Old 03-19-09, 05:50 AM Thread Starter
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Re: BroadBand Bass Trap's Build

Well I have A little time on my hands so Have decided to make some Broadband QRD based Abffusors (diffusor absorber in one acoustic panel) ...

I have designed & drawn up my plans, I will be making A prototype first & then pump out A few of these for my back wall and so on...I am going to make the sides of the frame out of 1-1.5mm sheet metal (pre fab to my spec) this time to keep the weight down and give them A total prof manufacture look....

Bradfords Semi Rigid fiberglass 2" Ultratel" with brown kraft paper or thin plastic film will be used for membrane to reject high freq & 3mm plywood to form the veins of the Diffusor...

Specs for abffusor:
-------------------
Diffusion (QRD)
Prime seed = 13
Frequencey = 945hz
Frequency low = 708.8 Hz
Frequency high = 3,448.9 Hz (My flutter Echo diffusors work from 3400hz up
--------------------------------------------------------------------------
Absorbtion: 800-700hz down
NRC=102, 2"ultratel(705) up to 7" thick
-----------------------------------------
The total outside dimentions (OD) will be:
H = 1.2mt (4')
W = 70-75cm (2.4'
D = 17.4cm (7")
-------------------------------------
Colour: Black


Picked up my Ultratel so getting the rest of my stuff tomorrow
more step by step pictures to come
Cheers....
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BroadBand Bass Trap's Build-2-ultratel-spec.jpg  

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post #93 of 175 Old 03-19-09, 07:26 AM
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Re: BroadBand Bass Trap's Build

Awesome! Sounds like you have it well planned out!

I'm still having trouble trying to fathom how it works, but the kraft paper part makes much more sense now!

I can hardly wait to see them!
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post #94 of 175 Old 03-19-09, 10:27 AM Thread Starter
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Re: BroadBand Bass Trap's Build

Hi Eric, Good to hear from you mate..

Because my time is fairly limited (to many things going on) I will be running around tomorrow to source the parts for the prototype so I can then have A fully assembled/working Abffusor to relay to potential metal fab companys A clear understanding of what I will require them to manufacture/fabricate in regards to the metal frames only....

Cheers.....
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post #95 of 175 Old 03-19-09, 10:36 AM
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Re: BroadBand Bass Trap's Build

That part sounds awesome!

I'm working on building up my first router table this weekend. I have the router, fence, and router plate arrived yesterday...I just need to build the table and cabinet!

It seems kinda backwards though, since I should probably be sticking with the table saw for the deeper flutter breakers I hope to build, but I think your way of doing the diffusers on the router is much easier than what I was doing on the table saw!

Looking forward to seeing your projects!
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post #96 of 175 Old 03-19-09, 11:32 AM Thread Starter
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Re: BroadBand Bass Trap's Build

Hi Eric,
Actualy I would think the table saw method would be much faster thus easier to produce the flutter echo tiles, where as the router method would be A lot slower but offer A more precision/ tighter tolerance diffusing well....
So each has trade offs LOL...

Cheers mate...
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post #97 of 175 Old 03-19-09, 11:56 AM
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Re: BroadBand Bass Trap's Build

Thanks for those thoughts...that's how I was feeling about it as well.

Good luck on your next build! These are a great inspiration to me, and hopefully to others as well!
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post #98 of 175 Old 03-19-09, 05:52 PM
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Re: BroadBand Bass Trap's Build

Quote:
cinema mad wrote: View Post
I am going to make the sides of the frame out of 1-1.5mm sheet metal (pre fab to my spec) this time to keep the weight down and give them A total prof manufacture look...
Jason...Are you just going to use the sheet metal as side edging around the perimeter of the panels, for decoration purposes, or does it serve some other use.?

Prof..
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post #99 of 175 Old 03-19-09, 09:53 PM Thread Starter
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Re: BroadBand Bass Trap's Build

Hi Prof, Good to hear from you mate..
The Frame of the Abffusors will be fabricated/constructed of 100% 1-1.5mm mild steel sheet to keep the weight down as opposed to 20mm wood, The frame will contain 16 folds total to add to the rigidity and all precession lazer cut.. Also there will be some pattern in the side of the frame to further reduce the weight but not sure what at this stage....

Cheers...
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post #100 of 175 Old 03-19-09, 10:07 PM
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Re: BroadBand Bass Trap's Build

Quote:
cinema mad wrote: View Post
The frame will contain 16 folds total
What are the folds?
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