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Boominator build (UK)... |
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slaz 
Old Croc 
Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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 Posted: 03 April 2015 at 12:40pm |
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Got a couple of panels of Hexlite here - different shapes, but about 2m^2 in total.
Density is (I think) about 80Kg/m^3 ..... similar to balsa wood methinks. Looking forward to making a box of some sort from this - although I suspect a conventional ply baffle would be reqd, as cutting/machining the stuff is not so possible. |
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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DJ-Dulux
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Joined: 24 August 2009 Location: Kenilworth, UK Status: Online Points: 379 |
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Posted: 03 April 2015 at 1:59pm |
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No idea then, we can not find an error... Will check again, although not sure what else is left.
Dupe... |
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Dupe...
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Saturnus
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Joined: 13 July 2010 Location: Copenhagen Status: Offline Points: 2025 |
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Posted: 03 April 2015 at 6:53pm |
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Let's review
Fronts are 2x900x300mm = 0.54m2 Top/Bottom are 2x276x900mm = 0.4968m2 Braces are 2x393x276mm = 0.216936m2 Ends/Internals are 4x276x276mm = 0.307404m2 Handle/Ports are 2x96x276 = 0.052992m2 So total wood needed is 1.614132m2 The cut outs are Woofers 4x222mmØ = 0.154830m2 Tweeters 4x76mmØ = 0.018146m2 Brace diffuser 20x62mmØ = 0.090572m2 Ports and vents 8x66mmØ = 0.02737m2 Port slits 2*96*62mm = 0.011904m2 Access cuts 2x156x66mm = 0.020592m2 Cut out total is 0.323381m2. That's 1/5th... how did I get it to 1/3rd.... hmm Anyway... that's total of 1,290751m2 times the average 11.8mm thickness is 0,0152308618m3 and 10.7834501544kgs if the WISA numbers are correct. But mine was demonstrative lighter so the weights numbers given by WISA must be incorrect. Granted I did use stored WISA FORM that probably has a significantly lower humidity than factory fresh sheets so that may account for it.
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WesleyK
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Joined: 24 December 2012 Status: Offline Points: 90 |
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Posted: 03 April 2015 at 9:47pm |
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I might be able to put mine on a scale this weekend. If I remove the electronics module its pretty much only the plywood + speakers. Should give us a rough idea of the weight of the wood (after substracting the weight of the speakers ofc)
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Shortrope
Young Croc 
Joined: 08 July 2013 Location: Ireland Status: Offline Points: 1232 |
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Posted: 04 April 2015 at 11:32am |
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Ye won't care how much it weighs once you hear it!!
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My Tinnitus is coming along nicely!!
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DJ-Dulux
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Joined: 24 August 2009 Location: Kenilworth, UK Status: Online Points: 379 |
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Posted: 04 April 2015 at 12:27pm |
Thanks for the information, it seems to confirm that our calcs are correct. Our model with wisa birch is at just over 11kg, we have used 12mm thickness as this is the mean thickness, tolerance is 12mm +- 0.5mm, we also have 2 shelves in the battery location. Therefore our prediction and your calculation look about right. 11kg verses 10.8kg? Thanks for the support, was beginning to worry that we had made a big error in the design... Dupe... |
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DJ-Dulux
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Joined: 24 August 2009 Location: Kenilworth, UK Status: Online Points: 379 |
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Posted: 04 April 2015 at 12:29pm |
I am getting excited now, already got an event lined up.... Baby rave in the local park.... Dupe... |
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Dupe...
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DJ-Dulux
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Joined: 24 August 2009 Location: Kenilworth, UK Status: Online Points: 379 |
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Posted: 08 April 2015 at 11:14am |
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Wisa ply is not easy to get in UK, therefore I am looking at SyPly, its a slightly lower spec at 665kg/m^3. Does anyone have any experience with it?
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Dupe...
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Saturnus
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Joined: 13 July 2010 Location: Copenhagen Status: Offline Points: 2025 |
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Posted: 09 April 2015 at 10:06am |
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I doubt there's much difference between reputable manufacturers. WISA is just the most well known.
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DJ-Dulux
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Joined: 24 August 2009 Location: Kenilworth, UK Status: Online Points: 379 |
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Posted: 09 April 2015 at 2:14pm |
That was my feeling also, although looking at the spec sheets wisa is marginally better... Dupe.... |
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Dupe...
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DJ-Dulux
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Joined: 24 August 2009 Location: Kenilworth, UK Status: Online Points: 379 |
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Posted: 14 May 2015 at 3:37pm |
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Just been looking at post #5882 on the DIYaudio Boominator thread and a different port configuration is suggested for the Basslite drivers. Not seen this mentioned before:
120mm wide 40mm high 24mm deep (2 ply layers) 40mm rounds on ends of slot Standard is: 120mm wide 30mm high 36mm deep (3 ply layers) 30mm rounds on ends of slot How does this change the set up, I could re-work to the 30mm high still, anyone compared? Dupe...
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Gavos
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Joined: 15 June 2013 Location: out there Status: Offline Points: 59 |
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Posted: 18 May 2015 at 4:21pm |
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Sorry to crash in but..................
After some time (year and a half) got the beast built from this  To this  Needs a paint job but sounds amazing. Solar to go on top and vents for electronic chamber. Thanks to Saturnus for the Boominator thread. |
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Saturnus wrote: