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HDT Enclosure Build Questions (Read 3101 times)
BBM3
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HDT Enclosure Build Questions
02/03/07 at 21:57:56
 
Hello All
I placed an order this week for HDT drivers, kit as well as a SE34I.2

While I wait for the hardware, I am building the HDT enclosures.

Q1:  The drawing notes for the elliptical ports state to use a series of 1/2” holes to cut the ellipse and leave the jagged edge.
Is this for sonic reasons?
I had planned to cut the ellipsis with a saber saw and use a 3/8” round over bit on both sides.

Q2: The 3 x 2 1/4 rear port as drawn looks like the top edge is somewhere near the center of the port plate. Is this correct?

Q3: Maybe a stupid question however I want to make sure I have it right….
The open ‘V’ in the top plate faces to the rear correct?

Any help and suggestions will be most appreciated.

Thanks
-Bill
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Young_SC
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Re: HDT Enclosure Build Questions
Reply #1 - 02/03/07 at 22:59:51
 
Hi Bill,

I'll answer Q3 for you.  

The V is at the back.  There are 4 internal triangular shaped chambers which sit on top of the bottom chamber.  The sound fills the front 3 chamber and go through the ports into the bottom chamber (the plate that separates all these chambers also has a rear facing V in it).  This then fires out the top of the speaker and hits the top plate.

Simon
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« Last Edit: 02/03/07 at 23:01:45 by Young_SC »  

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Ella Pualani
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Re: HDT Enclosure Build Questions
Reply #2 - 02/03/07 at 23:11:47
 
Bill

  Q1: Yes, its done that way for sonic reasons....You don't need to leave it to rough sand a little of the loose stuff off of were it breaks out

  Q2:  The top of the port is the same line as the top of the port plate.

  Q3:   Simon is correct.
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BBM3
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Re: HDT Enclosure Build Questions
Reply #3 - 02/03/07 at 23:34:36
 
WOW!!!
Thanks for the quick replies.
Even though it would be much easier / accurate to cut the ellipses with a saber saw I will follow the plan.

Thank you
-Bill
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utdjjer
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Re: HDT Enclosure Build Questions
Reply #4 - 02/05/07 at 19:41:36
 
how much is to be gained or lost by cutting the ellipses out on my CNC machine?  Any idea?  Minimal?
Thanks,
Jeremy
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ZYGI
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Re: HDT Enclosure Build Questions
Reply #5 - 02/05/07 at 20:30:43
 
Jeremy,

   Cutting it on the CNC will be fine, it will cut out the notches and still form the oval with the same effect. Much like making a cutout for square corners, where the bit travels out at a 45 from the 90 to remove the radius of the bit.

 Bob
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utdjjer
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Re: HDT Enclosure Build Questions
Reply #6 - 02/05/07 at 20:38:54
 
OK, Thanks, I think i didnt phrase my question right.. but i have answered it anyway.. I was wondereing what would be gained or lost, buy cutting the ellipses out so that they are smooth.. vs. drilling mutiple 1/2" holes and then breaking them out.  But since the CNC machine will be drilling the holes anyway.. i am just going to program it to drill mutiple holes..then break it out as instructed.

Thanks,  

Jeremy
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Falconer
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Re: HDT Enclosure Build Questions
Reply #7 - 02/06/07 at 17:25:24
 
I got anal with the ellipses on mine. I autocad a scale drawing of the ellipse with the 1/2" holes evenly spaced around the edge. I drill the holes and then jigsawed the center out. That way both speakers are the same.
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ZYGI
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Re: HDT Enclosure Build Questions
Reply #8 - 02/07/07 at 13:11:40
 
Falconer,

 I remember you doing that, I think you even posted the drawing on the forum. Thats was a good idea!!  

   I had my wife drilling the holes around the ellipse one day, after she got though with 3 or 4 of them she looked at me and said "there has got to be a better way"  I found one and it works well. If you are doing one pair, then the drill and knock out works well enough, but when you do several pair at a time, we usually build 8 pr at once, it can get a little tedious, why do you think I had her drilling the holes. Anyway cut out your ellipse then with a 1/2" router bit bump it into the edge of the ellipse about 1/2 way into the bit. Its very fast and gives a cleaner edge, I.E. there are no loose bits of wood that can fall off over years of sevice or during shipping, something we have to think about.

Bob
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Re: HDT Enclosure Build Questions
Reply #9 - 02/07/07 at 13:22:19
 
[quote author=Falconer  link=1170543476/0#7 date=1170782724]I got anal with the ellipses on mine. I autocad a scale drawing of the ellipse with the 1/2" holes evenly spaced around the edge. I drill the holes and then jigsawed the center out. That way both speakers are the same. [/quote]

I did mine the same way Grin
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