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  Topic Review (Newest First)
12-11-10 06:47 PM
SteveMA
Re: New Tempest-X2 15" Slot Ported Design (Sketchup Attached) - Feedback Appreciated

Steve,
I played around a bit more with SketchUP and was able to get something close. My drawing lacks the braces under and behind the port framework (I was happy to get a far as I did and, quite honestly, I forgot to add them). I've attached the .skp file but from my calculations for net volume (internal volume less port volume, less taken internal cabinet material, less volume displaced by driver) of 5.0 cu.ft.

I used 0.75" thicknesses for the drawing but, if I were to build the cabinet (as I intend to when I'm happy with it) I would probably go to 1.0" and/or more bracing.

Let me know what you think.

Steve(MA)
12-11-10 04:31 PM
SteveMA
Re: New Tempest-X2 15" Slot Ported Design (Sketchup Attached) - Feedback Appreciated

Hi Steve,
Thanks for the quick response. BTW, I am most interested in the external amp version. I would think any volume change would be minimal since the "floor" of the port would be shorter by ~4" and the vertical portion of the port would increase by the same amount. At any rate, it should be a fun project. I have been playing around with WinISD pro recently so it will be fun to compare notes.

Hope you enjoy the Jets game tomorrow. Here in the Twin Cities even if I had tickets to the Vikings game I doubt if I would be able to get there if the snow keeps up.
Thanks again,
Steve
12-11-10 03:37 PM
dboff01
Re: New Tempest-X2 15" Slot Ported Design (Sketchup Attached) - Feedback Appreciated

Quote:
SteveMA wrote: View Post
Steve (dboff01),
I like the design. I am envious of your SketchUp skills (I'm still watching the tutorials). I am also planning to build a couple of ported Tempest X2 subs (PR's just add too much expense now that I'm on a fixed income) and your design would be ideal if I could swap the depth and height (ie ~24" deep and ~28" high vs your 28X24 respectively). It would be nice (and convenient) if one could "squeeze" the 28 down to 24 and "pull" the 24 into 28. Do you know if this is possible?
Thanks,
Steve also (SteveMA)
I believe that would increase the total volume slightly, which is a good thing.

I'll try to redraw the box to your specs, re-sim in WinISD, and post within a couple of days (Anniversary dinner tonight, going to Jets game tomorrow).

Steve
12-11-10 03:03 PM
SteveMA
Re: New Tempest-X2 15" Slot Ported Design (Sketchup Attached) - Feedback Appreciated

Steve (dboff01),
I like the design. I am envious of your SketchUp skills (I'm still watching the tutorials). I am also planning to build a couple of ported Tempest X2 subs (PR's just add too much expense now that I'm on a fixed income) and your design would be ideal if I could swap the depth and height (ie ~24" deep and ~28" high vs your 28X24 respectively). It would be nice (and convenient) if one could "squeeze" the 28 down to 24 and "pull" the 24 into 28. Do you know if this is possible?
Thanks,
Steve also (SteveMA)
07-29-10 05:33 AM
dboff01
Re: New Tempest-X2 15" Slot Ported Design (Sketchup Attached) - Feedback Appreciated

Quote:
Nick69 wrote: View Post
Bummer.

What design changes were you thinking of making?
I've been kicking around different ideas such as ported vs passive radiator, 15" vs 18" vs dual 12", plate amp vs external amp, budgets ranging from $500 to $1500, etc.

I'm not really locked in to any one design yet. It will primarily come down to what size box I can convince my wife won't ruin our den and how much money I'm willing to spend at the time of the build.

Steve
07-29-10 03:37 AM
Lucky7!
Re: New Tempest-X2 15" Slot Ported Design - Feedback Appreciated

Quote:
paulspencer wrote: View Post
I read an AES paper on vents that actually shows that the best profile has two radii - one which has a very large radius where the cross sectional area increases from the centre to the ends, and another at the ends where there is a transition. This is virtually impossible for a diyer to realise in a circular vent, but could easily be done with slot ports made with 3mm MDF bent into shape. This is one feature of a slot port that I haven't seen tried, but if I was going to make a slot port it's what I'd do. The paper is called

Maximising performance from Loudspeaker ports
No 4855
Alex Salvatti and Doug Button
JBL Professional
Northridge, CA, USA
Allan Devantier
Infinity Systems
Northfidge, CA, USA
Just for reference, this paper is available here.

Quote:
paulspencer wrote: View Post
Very interesting paper, just wish I could figure out the formula that actually determines tuning!!!
Do you mean this one?

Quote:
paulspencer wrote: View Post
Of course, you have to choose a point to draw the line between practical and ideal and decide how far you want to go.
That's very true.
07-29-10 01:05 AM
Nick69
Re: New Tempest-X2 15" Slot Ported Design (Sketchup Attached) - Feedback Appreciated

Quote:
dboff01 wrote: View Post
It's not.

With other home project and financial obligations, I'll be lucky if I can build before the end of the year. If you've seen the Money Pit with Tom Hanks, that's pretty close to my life.

In the meantime, I continue to model (WinISD) and draw (Sketchup) various enclosures/drivers/configurations to determine ultimately what I will build when I get the chance.

Steve
Bummer.

What design changes were you thinking of making?
07-28-10 11:38 AM
dboff01
Re: New Tempest-X2 15" Slot Ported Design (Sketchup Attached) - Feedback Appreciated

Quote:
Nick69 wrote: View Post
How is the build going dboff01?
It's not.

With other home project and financial obligations, I'll be lucky if I can build before the end of the year. If you've seen the Money Pit with Tom Hanks, that's pretty close to my life.

In the meantime, I continue to model (WinISD) and draw (Sketchup) various enclosures/drivers/configurations to determine ultimately what I will build when I get the chance.

Steve
07-28-10 12:18 AM
Nick69
Re: New Tempest-X2 15" Slot Ported Design (Sketchup Attached) - Feedback Appreciated

How is the build going dboff01?

Just interested as i'm looking at using your design as a base for my own DIY build.
04-04-10 09:50 PM
Ricci
Re: New Tempest-X2 15" Slot Ported Design (Sketchup Attached) - Feedback Appreciated

Good post Paul.
This thread has more than 10 replies. Click here to review the whole thread.

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