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Old 22nd December 2010, 04:10 AM   #21
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Thank you Rademakers, and thank you Don Hills. You have made Cubos understandable. I have presented several designs and have always included
the HornResp input screen with the building plans. This allows people to modify the design or change the driver and sim the modifications. Not everyone
uses the inputs, not everyone cares. Rademakers use of comparative inside SPL/Freq plots is valid, just not my preference.

Thanks guys for your contributions to this forum, I have learned something!

Don
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Last edited by Don Snyder; 22nd December 2010 at 04:15 AM.
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Old 22nd December 2010, 04:34 AM   #22
tb46 is offline tb46  United States
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Default Cubo and Hornresp

Hi,

The other way to model the Cubo in Hornresp is to treat the chamber as a large throat chamber (Vtc/Atc), set S1 and S2 to the horn throat size, the other three sections can be used to define the horn and the driver location.

Regards,
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File Type: jpg Cubo15_Std_Input.jpg (36.2 KB, 936 views)
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Old 22nd December 2010, 04:58 AM   #23
tb46 is offline tb46  United States
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Hi,

A while back a made a quick sketch of three different models of the Cubo15 (sorry, I don't recall where I found the original data). This is not a completed drawing, and should not be seen as such, just to show the different versions, and the general locations for the Hornresp data inputs.

Regards,
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File Type: pdf Cubo15_Stages.pdf (45.2 KB, 383 views)
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Old 22nd December 2010, 10:13 AM   #24
Boscoe is offline Boscoe  United Kingdom
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Okay so I am now making a Cubo 12, I have ordered an Eminence Delta 12LF hopefully it'll be here by christmas!
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Old 22nd December 2010, 07:57 PM   #25
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Quote:
as the room interactions would affect both cabinets
The measurements (gain over 18") have been consistent in quite different rooms.

Your measurements also give more low end in the 40 Hz area as the HR sim, do they not? My tapped horns I build seem to keep closer to the HR sims then these "tapped reflexes". Perhaps it's super stitious but .for that reason I keep significant chamber sizes in my design

Quote:
close enough to be able to use Hornresp as a protoyping tool
I did come to the same conclusion, pretty much in the same way. That method also allowed me to simulate Cubo Extended in Hornresp.

Quote:
The other way to model the Cubo in Hornresp is to treat the chamber as a large throat chamber (Vtc/Atc), set S1 and S2 to the horn throat size
I use this method mostly. Except I use different segment steps and arrive at a different chamber size (smaller). Regarding the pdf: That first Cubo design isn't mine, it looks more like a ARLS IIRC.
I do think Cubo Extended is recommended.

@Boscoe: Good luck with the build! Perhaps some pictures could be in order?

Best regards Johan
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Old 22nd December 2010, 08:40 PM   #26
Boscoe is offline Boscoe  United Kingdom
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Quote:
@Boscoe: Good luck with the build! Perhaps some pictures could be in order?

Best regards Johan
Yes by all means should be all done after in the new year!
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Old 22nd December 2010, 10:28 PM   #27
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Although the "simplified" Cubo model for Hornresp may not match the real thing exactly, it is still useful for testing different drivers for use in the design. Once you see the results for the recommended driver, you can see if an alternate driver will provide similar results. You can also use the Wizard to nudge some of the dimensions and see if changes to the geometry would improve the performance with the alternate driver.

The main thing that is usually missing from these models is the amount by which the driver volume changes the dimensions. This can be sigificant when the driver is placed in a narrow part of the horn, but is probably not a problem in Cubo where the driver is placed in either the "back chamber" or the "horn mouth", both of which are generously sized. To try it, work out the profile area (side view) of your chosen driver, then subtract it from either S2 or S4 as appropriate.
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Old 26th December 2010, 07:53 PM   #28
tb46 is offline tb46  United States
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Hi Don Hills,

I would recommend against subtracting the driver profile from S2 or S4 in Hornresp, it could alter the overall horn profile too much, e.g.: take a look at what that would do to the TH-Spud. I would disregard this in Hornresp, and use AkAbak for the more detailed analysis.

Regards,

Hi Boscoe,

I want to add the source for the original data used to generate the sketch in Post #23:

Home

There you'll also find a page on the Cubo12:

Cubo 12

I'll attach an Hornresp SPL and Impulse comparison between the cubo-12 from that page, and a simple bass-reflex.

Regards,
Attached Images
File Type: jpg 12LFA_BR_TBRV_SPL_Impulse_comp.jpg (52.7 KB, 785 views)
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Old 9th January 2011, 09:21 AM   #29
Boscoe is offline Boscoe  United Kingdom
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Just finished glueing together my cubo 12 and have been listening it's amazing! Even at just 25W!

The driver used. Eminence Delta 12LF.

Click the image to open in full size.

In the glueing stages.

Click the image to open in full size.

Click the image to open in full size.

The internals.

Click the image to open in full size.

Glued.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

It sounds great too. Excuse the bad pic qualtiy good old iphone!
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Old 9th January 2011, 10:36 AM   #30
epa is online now epa  Netherlands
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good job
how many r u going to bild?

oftopic/kan someone take a look here ,i used the same approximation as tb46 suggested for the cubo.
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