Submitted for your approval, Isobaric cab.

Smeneice · 10th March 2013, 09:47 PM

I was recently given 8 - 10" Bugera drivers with aluminum cones. Rated @ 240 watts each. I've never tried an Isobaric cabinet before. Designed and built lots of P.A. speakers and all have worked very well. Thought I'd put this design up and see if there were any opinions. 3/4" ply with 4-2" vents 18" long and insulation dampening. Some details left off plan for clarity.
Thank you for your consideration!

Cal Weldon · 14th March 2013, 08:08 PM

I am moving this over here. Hopefully you'll get a better response.

weltersys · 14th March 2013, 08:30 PM

Quote:

Originally Posted by Smeneice

I was recently given 8 - 10" Bugera drivers with aluminum cones. Rated @ 240 watts each. I've never tried an Isobaric cabinet before. Designed and built lots of P.A. speakers and all have worked very well. Thought I'd put this design up and see if there were any opinions. 3/4" ply with 4-2" vents 18" long and insulation dampening. Some details left off plan for clarity.
Thank you for your consideration!

If the drivers are not back vented, or the vents do not make noise, I would suggest mounting the drivers cone to cone, reversing the polarity of the drivers with the magnets out.
Simplifies construction, reduces even order harmonic distortion, and the reduced enclosed area makes the output sound "tighter".

Inductor · 14th March 2013, 08:33 PM

Can't find any pdf for datasheets?
Is it a subwoofer, I don't see any advantage of using it isobaric if it isn't?

Smeneice · 15th March 2013, 02:10 AM

Thanks for relocating this Cal. There seems to be immidiate intrest.

Smeneice · 15th March 2013, 02:22 AM

There are 4 - 2"dia 18" long ports starting in the rear chamber and running through the faceplate.

Smeneice · 15th March 2013, 02:27 AM

No PDF's I'm just not that advanced. I'm not really building it for a specific use. It's more of an experiment to see what an isobaric cabinet is all about.

NEO Dan · 15th March 2013, 02:56 AM

You must ask what do you gain by going isobaric?
You are effectively wasting 4 drivers worth of acoustic output IMO.
What is the intended use, bass cab, PA sub, home sub?

Smeneice · 15th March 2013, 03:40 AM

Precicely. That's what I want to know. What do I gain from going isobaric. A friend told me about them. Then I got the free drivers and I'm always building something. Usaully bass bins. I could always use any of those types of bin. Bass cab or sub. Just experimenting really. Have got lots of power to try with them. Just thought I'd put the design out here first to get some feed back from people such as yourself.

)

Zero D · 15th March 2013, 03:00 PM

@ Smeneice

Quote:

What do I gain from going isobaric.

Half the volume required of the box.

14th March 2013, 08:08 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I am moving this over here. Hopefully you'll get a better response. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

14th March 2013, 08:33 PM	#4
Inductor diyAudio Member Join Date: Feb 2006 Location: Cascais	Can't find any pdf for datasheets? Is it a subwoofer, I don't see any advantage of using it isobaric if it isn't? __________________ NEXT-proaudio Portugal William Ralston Music Listening Library

15th March 2013, 02:56 AM	#8
NEO Dan diyAudio Member Join Date: Jun 2008	You must ask what do you gain by going isobaric? You are effectively wasting 4 drivers worth of acoustic output IMO. What is the intended use, bass cab, PA sub, home sub? __________________ Regards, Dan

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15th March 2013, 02:10 AM	#5
Smeneice diyAudio Member Join Date: Mar 2013 Location: Vancouver B.C.	Thanks for relocating this Cal. There seems to be immidiate intrest.

15th March 2013, 02:22 AM	#6
Smeneice diyAudio Member Join Date: Mar 2013 Location: Vancouver B.C.	There are 4 - 2"dia 18" long ports starting in the rear chamber and running through the faceplate.

15th March 2013, 02:27 AM	#7
Smeneice diyAudio Member Join Date: Mar 2013 Location: Vancouver B.C.	No PDF's I'm just not that advanced. I'm not really building it for a specific use. It's more of an experiment to see what an isobaric cabinet is all about.

15th March 2013, 03:40 AM	#9
Smeneice diyAudio Member Join Date: Mar 2013 Location: Vancouver B.C.	Precicely. That's what I want to know. What do I gain from going isobaric. A friend told me about them. Then I got the free drivers and I'm always building something. Usaully bass bins. I could always use any of those types of bin. Bass cab or sub. Just experimenting really. Have got lots of power to try with them. Just thought I'd put the design out here first to get some feed back from people such as yourself. )

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