Bose subwoofers/waveguide technology

Bill poster · 9th May 2010, 09:31 PM

Looking at compact horns etc and wondered what system Bose use in their Bass enclosures- is it a type of horn/transmission line system? I am guessing its one-eighth wavelength but might be completely wrong.

Psychobiker · 9th May 2010, 09:48 PM

Searching will find it - I think it's a small-multiple wavelength with the driver some 1/4 way along it.

Bill poster · 9th May 2010, 09:52 PM

googled some more- when Bose did the proto they basically fitted a 2 metre length folded system into a tiny box. So must be quarter wave length tuned for around 40 hz or so

neddludd · 10th May 2010, 05:47 AM

something to note is that you dont see people DIYing these. I would instead start from a required cutoff,SPL and volume of enclosure. Then proceed to driver availability.

ThorstenL · 10th May 2010, 10:19 AM

Hi,

Quote:

Originally Posted by Bill poster

Looking at compact horns etc and wondered what system Bose use in their Bass enclosures

It varies.

Many Bose LF systems are bandpass. This goes both for pro and "lifestyle" systems. These are usually tuned for maximum efficiency and do not go very low or very wide bandwidth, so they usually play a good one or two note bass.

The "wavecannon" was/is basically a quarterwave pipe with the driver near 1/3rd of the pipe (so there are actually three resonances) without damping, so plays a lovely three-note bass.

The waveradio uses a variation of the wavecannon, but it has zip low frequency output that I could detect, based on what I heard not even 100Hz. Well, it is a very small thing and you cannot cheat physics. What little upper bass was there was again very "a few notes".

With all due respect, the only thing IMNSHO that one can learn from Bose LF systems is how not to do it...

Ciao T

MaVo · 10th May 2010, 10:27 AM

You can learn what good marketing can make out of bad products

Bill poster · 10th May 2010, 02:05 PM

Nice aesthetics and maxing the most out of cheap components- clever people I'd say.

Josh Ricci · 10th May 2010, 07:32 PM

Bose uses an 8th order bandpass for most of their small subs. Very tricky to get right, but it can extract a lot of output from very modest drives.

neddludd · 10th May 2010, 10:19 PM

Quote:

Originally Posted by Josh Ricci

Bose uses an 8th order bandpass for most of their small subs. Very tricky to get right, but it can extract a lot of output from very modest drives.

I remember reading Weems, perhaps it was this one Designing, building, and testing ... - Google Books Where he discussed how the higher the order of rolloff the lower the perceived quality of the sound. It may have been another book though its been 6years since I read it. Also interesting articles on panel resonance and FEA

Bill poster · 12th May 2010, 11:46 AM

Seems to me that the cheapest way to get deep controlled bass from a small enclosure is the aperoidic route. A large driver in a compact 'leaky' box..

9th May 2010, 09:31 PM	#1
Bill poster diyAudio Member Join Date: Jun 2008 Location: London/Bangkok	Bose subwoofers/waveguide technology Looking at compact horns etc and wondered what system Bose use in their Bass enclosures- is it a type of horn/transmission line system? I am guessing its one-eighth wavelength but might be completely wrong.

9th May 2010, 09:48 PM	#2
Psychobiker diyAudio Member Join Date: Jul 2005 Location: Montréal QC	Searching will find it - I think it's a small-multiple wavelength with the driver some 1/4 way along it. __________________ http://blog.liammartin.com

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9th May 2010, 09:52 PM	#3
Bill poster diyAudio Member Join Date: Jun 2008 Location: London/Bangkok	googled some more- when Bose did the proto they basically fitted a 2 metre length folded system into a tiny box. So must be quarter wave length tuned for around 40 hz or so

10th May 2010, 05:47 AM	#4
neddludd diyAudio Member Join Date: Apr 2010	something to note is that you dont see people DIYing these. I would instead start from a required cutoff,SPL and volume of enclosure. Then proceed to driver availability.

10th May 2010, 10:27 AM	#6
MaVo diyAudio Member Join Date: Jan 2006 Location: Herne	You can learn what good marketing can make out of bad products

10th May 2010, 02:05 PM	#7
Bill poster diyAudio Member Join Date: Jun 2008 Location: London/Bangkok	Nice aesthetics and maxing the most out of cheap components- clever people I'd say.

10th May 2010, 07:32 PM	#8
Josh Ricci diyAudio Member Join Date: Apr 2009	Bose uses an 8th order bandpass for most of their small subs. Very tricky to get right, but it can extract a lot of output from very modest drives.

12th May 2010, 11:46 AM	#10
Bill poster diyAudio Member Join Date: Jun 2008 Location: London/Bangkok	Seems to me that the cheapest way to get deep controlled bass from a small enclosure is the aperoidic route. A large driver in a compact 'leaky' box..