DIY Beginner - Tempest X2 Ported - Page 6 - Home Theater Forum and Systems - HomeTheaterShack.com

Old 05-08-10, 06:59 PM
Senior Shackster
dboff01

Join Date: Feb 2010
Location: Long Island, NY
Posts: 251
My System
Re: DIY Beginner - Tempest X2 Ported

Quote:
fazz wrote: View Post
I notice everything is rounded off in the sketchup. I'm assuming the edges are rounded off with a 1/4 round off bit so it's unclear to me if this piece is supposed to be 13" (with 1/4 rounded off) or if its truly a 12 3/4 cut. Could someone clarify?
I drew the Sketchup such that the centerline of the port would match the port length in WinISD (37") for the straight port pieces, not including the flared ends. The reality is, < 1" differences in the port length will effect the tuning frequency of the box by less than 0.3 Hz. In other words, flare the ends of the ports with roundovers/molding to minimize port turbulence, and don't sweat the small stuff. +/- 1/4" won't make a bit of difference in the end.

Quote:
fazz wrote: View Post
Also is there a way besides using the Tape Measure in the application to determine the size of the pieces?
No ... as drawn, Sketchup has no concept that the box is made of pieces, it is simply a collection of lines and surfaces. The measuring tool is the only way to extract the dimensions you need.
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Old 05-08-10, 07:19 PM Thread Starter
Shackster

Join Date: May 2010
Location: Atlanta, GA
Posts: 62
Re: DIY Beginner - Tempest X2 Ported

Quote:
dboff01 wrote: View Post
I drew the Sketchup such that the centerline of the port would match the port length in WinISD (37") for the straight port pieces, not including the flared ends. The reality is, < 1" differences in the port length will effect the tuning frequency of the box by less than 0.3 Hz. In other words, flare the ends of the ports with roundovers/molding to minimize port turbulence, and don't sweat the small stuff. +/- 1/4" won't make a bit of difference in the end.

Good to know, I can let the perfectionist in me calm down a bit.

Looks like I have a couple more port pieces to cut and I can start the routing/gluing.

Thanks for all the help
fazz is offline
Old 05-09-10, 08:18 PM
Elite Shackster

lsiberian

Join Date: Mar 2009
Location: Fort Worth, TX
Posts: 2,625
Re: DIY Beginner - Tempest X2 Ported

Remember to seal the seams internally. Leaks can really hurt performance.
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Old 05-10-10, 11:13 AM Thread Starter
Shackster

Join Date: May 2010
Location: Atlanta, GA
Posts: 62
Re: DIY Beginner - Tempest X2 Ported

Whats the easiest way to cut out the two rectangular port holes in the front baffle?

I was thinking, drill a hole in the center of the port piece (so I can get the router bit in) and just free hand the square? (1/4 up spiral bit)

Any better ideas?
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Old 05-10-10, 02:11 PM Thread Starter
Shackster

Join Date: May 2010
Location: Atlanta, GA
Posts: 62
Re: DIY Beginner - Tempest X2 Ported

got the Tempest today, yea.

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Old 05-10-10, 02:45 PM
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lsiberian

Join Date: Mar 2009
Location: Fort Worth, TX
Posts: 2,625
Re: DIY Beginner - Tempest X2 Ported

Quote:
fazz wrote: View Post
Whats the easiest way to cut out the two rectangular port holes in the front baffle?

I was thinking, drill a hole in the center of the port piece (so I can get the router bit in) and just free hand the square? (1/4 up spiral bit)

Any better ideas?
No need to drill a hole with a spiral upcut bit. However I'd use a jig saw. to rough cut it and a template or flush trim bit to clean up the cut.
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Old 05-10-10, 06:05 PM Thread Starter
Shackster

Join Date: May 2010
Location: Atlanta, GA
Posts: 62
Re: DIY Beginner - Tempest X2 Ported

So I went to lowes today and picked out some router bits but I'm not quite sure I picked the right ones...

I want to roundover (full radius) the inner port pieces to give a smooth path for the air to travel but I'm not sure which roundover bits will achieve this with 3/4 mdf... any ideas? I'm guessing 3/8 roundover bit on both sides?

Ideally I'd like the bit to double as the roundover for the external edges as well but thats not as important... I'm leaning towards veneering or putting some lament on the exterior but I haven't decided yet. Would it be easier to veneer/lament rounded edges to make it look more seamless?

I'm thinkin' I'd like like it to match the rest of my speakers if possible, rosewood veneer?

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Old 05-10-10, 06:11 PM
Elite Shackster

lsiberian

Join Date: Mar 2009
Location: Fort Worth, TX
Posts: 2,625
Re: DIY Beginner - Tempest X2 Ported

Quote:
fazz wrote: View Post
So I went to lowes today and picked out some router bits but I'm not quite sure I picked the right ones...

I want to roundover (full radius) the inner port pieces to give a smooth path for the air to travel but I'm not sure roundover bits will achieve this with 3/4 mdf... any ideas?

Ideally I'd like the bit to double as the roundover for the external edges as well but thats not as important... I'm leaning towards veneering or putting some lament on the exterior but I haven't decided yet.

I'd like it to match the rest of my speakers if possible, rosewood veneer?

I'd just use some quarter round in the turn. You can find it in the framing department. You can find any veneer online, but it may not match your speakers. However you can get close enough.

What type of router do you have?
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Old 05-10-10, 06:23 PM Thread Starter
Shackster

Join Date: May 2010
Location: Atlanta, GA
Posts: 62
Re: DIY Beginner - Tempest X2 Ported

DeWalt DW618PK (fixed and plunge)

Not sure what you mean by "use some quarter round in the turn"...

<-- wood working novice.

And it doesnt have to match exactly, ill put a pic of the 12 I have now shortly; it matches enough for me.
fazz is offline
Old 05-10-10, 06:34 PM Thread Starter
Shackster

Join Date: May 2010
Location: Atlanta, GA
Posts: 62
Re: DIY Beginner - Tempest X2 Ported

Little messy, working on resolving that soon.

fazz is offline

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