3 way bipole loudspeakers

Thomasjunta · 31st August 2007, 05:46 PM

Hi,
I think of building 3way floorstanding loudspeakers using HiVi units, I'm interested in bipole woofers design. Does the cabinet volume has to be doubled for 2 speakers in bipole design as it normally is in normal speakers placement or can it be smaller? Is it possible to mount them in cabinet with volume for only one unit (I prefer as small as possible)?
The woofers are HiVi D10G

planet10 · 31st August 2007, 08:09 PM

The 2 woofers would require 2x the volume of a single to get the same alignment

dave

Landroval · 31st August 2007, 08:31 PM

If you use 4 drivers, 2+2 in an isobaric configuaration, the box volume will remain the same as it would be with only 1 woofer.

Saturnus · 31st August 2007, 08:38 PM

According to standard calculations, yes, you'd need 2x the cabinet size. However, if you mount the bipole woofers magnet to magnet inside the cabinet, it's my experience that something strange happens, wave cancelation perhaps but that's only a guess, and you can get away with a cabinet 20%, or sometimes even 25% smaller, while still maintaining all the other calculations. The HiVi D10G woofer however is not a good candidate for that.

31st August 2007, 05:46 PM	#1
Thomasjunta diyAudio Member Join Date: Mar 2007	3 way bipole loudspeakers Hi, I think of building 3way floorstanding loudspeakers using HiVi units, I'm interested in bipole woofers design. Does the cabinet volume has to be doubled for 2 speakers in bipole design as it normally is in normal speakers placement or can it be smaller? Is it possible to mount them in cabinet with volume for only one unit (I prefer as small as possible)? The woofers are HiVi D10G

31st August 2007, 08:09 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	The 2 woofers would require 2x the volume of a single to get the same alignment dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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31st August 2007, 08:31 PM	#3
Landroval diyAudio Member Join Date: Oct 2004	If you use 4 drivers, 2+2 in an isobaric configuaration, the box volume will remain the same as it would be with only 1 woofer.

31st August 2007, 08:38 PM	#4
Saturnus diyAudio Member Join Date: Jun 2005 Location: Copenhagen, Denmark	According to standard calculations, yes, you'd need 2x the cabinet size. However, if you mount the bipole woofers magnet to magnet inside the cabinet, it's my experience that something strange happens, wave cancelation perhaps but that's only a guess, and you can get away with a cabinet 20%, or sometimes even 25% smaller, while still maintaining all the other calculations. The HiVi D10G woofer however is not a good candidate for that.

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