How do you model a Ripole sub? - diyAudio
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Old 13th June 2011, 08:03 AM   #1
markusA is offline markusA  Sweden
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Default How do you model a Ripole sub?

I'm having great difficulty finding reliable information on how to model the Ripole?
Can someone please tell me how to set up a good simulation?
Atm I have BASTA and Hornresp but I could probably get my hands on other software as well if I have to.
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Old 13th June 2011, 12:49 PM   #2
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My neighbor built a Ripole against all good advice. We auditioned it.
This is a completely accurate simulation of that disappointing event.
No, Seriously... And he did everything by the book too.

If you want to waste perfectly good wood on something that
cannot be simulated, yet actually works, go build a Karlson.

Last edited by kenpeter; 13th June 2011 at 01:08 PM.
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Old 13th June 2011, 03:04 PM   #3
tb46 is offline tb46  United States
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Default Ripol: Referencec and Example Drawing

Hi markusA,

The Ripol will have all the advantages and disadvantages of the the dipole as advocated by many, e.g.: Dipole Woofer.

To model a Ripol you'll have to use something like AkAbak, as the Ripol is designed with the integrated use of a passive filter, a good example is the:

RiPole Subwoofer

See the building instructions for a diagram of the required filter.

There are quite a few threads on diyaudio pertaining to ripols.

This is not a subwoofer for loud home theater applications, nor any other form of "big" bass, neither are other forms of open baffle (dipole) woofers (until you get into large numbers of drivers, and large baffles).

A simple rule of thumb for the dimensions is to keep it as small as possible while providing a front opening of 1/4 to 1/3 x Sd, and a rear opening of 1/2 to 1 x Sd. I'll attach a simple example drawing: never build, untested, example only.

As a ripol is simple to build you should give it a try, and make up your own mind.

Regards,
Attached Files
File Type: pdf 18inch_example.pdf (39.8 KB, 476 views)
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Old 13th June 2011, 08:25 PM   #4
zobsky is offline zobsky  India
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Quote:
Originally Posted by tb46 View Post
Hi markusA,

The Ripol will have all the advantages and disadvantages of the the dipole as advocated by many, e.g.: Dipole Woofer.

To model a Ripol you'll have to use something like AkAbak, as the Ripol is designed with the integrated use of a passive filter, a good example is the:

RiPole Subwoofer

See the building instructions for a diagram of the required filter.

There are quite a few threads on diyaudio pertaining to ripols.

This is not a subwoofer for loud home theater applications, nor any other form of "big" bass, neither are other forms of open baffle (dipole) woofers (until you get into large numbers of drivers, and large baffles).

A simple rule of thumb for the dimensions is to keep it as small as possible while providing a front opening of 1/4 to 1/3 x Sd, and a rear opening of 1/2 to 1 x Sd. I'll attach a simple example drawing: never build, untested, example only.

As a ripol is simple to build you should give it a try, and make up your own mind.

Regards,
I am the unlucky soul who built 2 different ripoles. OB, or even U-baffle with the same drivers were better, by any measure , except size. ie. sound quality or efficiency

If you do build one, be sure to post impressions.
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Last edited by zobsky; 13th June 2011 at 08:28 PM.
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Old 13th June 2011, 08:28 PM   #5
markusA is offline markusA  Sweden
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Before I even think about building one I need a way to model one.
I've been using Hornresp but the sims are so sh**ty that I must be doing something very wrong. Thus my question...

How to model a ripole?
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Old 14th June 2011, 09:51 AM   #6
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Hi markusA

Please contact Axel Ridthaler ( axel.ridtahler/št/fzk.de )
He is the commercial designer of the Ripol, and he can help you.
Hornres can not simmulated Ripols.
Sorry about my bad english,but i have not many practice for many years.

Greets from the valley

Stefan
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Old 14th June 2011, 08:02 PM   #7
tb46 is offline tb46  United States
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Default How to model a ripol in Hornresp (?)

Hi markusA,

I gave it another try. For comparison, and as a sanity check, here is a Hornresp Input/SPL for a dipole (H-frame, Dual) done by bjorno, and I used the same driver(s) for a ripol. Note that the ripol is done as OD (offset driver). The SPL curves are bold prior to combining, and light grey after combining @ 120cm. You could add inductance to Le (e.g.: Le=3 mH), and resistance to Rg (e.g.: Rg=0.15 Ohm) to simulate a series coil, but to get to the full ripol network you'll have to export the data (set length (L) to Con as it will not export as Par) to an AkAbak script. Then you can modify the result in AkAbak, etc...

Maybe that'll get you started.

Regards,
Attached Images
File Type: jpg dipole_ripol.jpg (140.1 KB, 971 views)
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Old 14th June 2011, 08:50 PM   #8
EUVL is offline EUVL  Europe
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Some info here :

My Ripole Project


Patrick
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Old 15th June 2011, 03:12 AM   #9
tb46 is offline tb46  United States
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Yes, that looks like zobsky's old thread.

Regards,
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Old 15th June 2011, 09:15 PM   #10
markusA is offline markusA  Sweden
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I was hoping to get away without having to resort to AkAbak.
That sim looks a little different from mine, I'll have a look and see what I can come up with?
At a first glance it looks like a notch and some EQ in the bottom is a start.

Last edited by markusA; 15th June 2011 at 09:17 PM.
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