Bose acoustimass

djronbxs · 19th November 2007, 02:12 PM

Hi,

how does bose produce that sound with that small drivers and enclosure ? is it a transmission line or those it have some electronics inside to produce the sound like that ?

thanks

GM · 19th November 2007, 02:41 PM

Greets!

Assuming you're referring to the bass module, yes to both: http://www.bose.com/controller?event...am_am16_15.jsp

The satellite speakers are heavily EQ'd custom single drivers in a tiny sealed alignment.

GM

linuxguru · 19th November 2007, 03:19 PM

At the risk of stating the obvious, there are far better-sounding satellites than the 2" satellites of Bose Acoustimass, at a fraction of the cost. In particular, the well-known silent gap between 200 to 280 Hz that exists in Bose Acoustimass satellites can easily be filled by using inexpensive (<$10) 3" full-ranges. For instance, check out the Zaph Audio bookshelves with 3" HiVi drivers:

http://www.zaphaudio.com/audio-speaker18.html

For the main Bose Acoustimass Bass unit, it is easily surpassed by a whole lot of designs that use a single, larger driver - starting at ~5.25" and higher. The 8" Pioneer BF20FU20 "Bofu" full-range driver at $25 is the best example, but there are numerous others.

The only thing going for Bose is the WAF (Wife Acceptance Factor) of small and inconspicuous components. But there's a price to be paid for that - which is poor sound quality.

djronbxs · 19th November 2007, 08:22 PM

but the acoustimass is a transmission line or what ?

lne937s · 19th November 2007, 09:20 PM

The "acoustimass" module is not a transmission line, but rather a bandpass box- the order of which depends on the model. These enclosures increase output in a narrow range. It uses this combined with EQ and emphasizes frequencies that people are sensitive to (80-100Hz) rather than attempting to play low bass frequencies (20-40Hz)

Sixth order bandpass:
http://www.carstereo.com/help/Articles.cfm?id=32

http://www.intellexual.net/bose.html

http://www.greengart.com/Columns/col...n%205%20Update

djronbxs · 20th November 2007, 06:37 AM

but the latest acoustimass subwoofer are not indise the encolure there are two under the box facing the floor

lne937s · 20th November 2007, 02:26 PM

I found what you are talking about... Well, it has a resonant cavity and a very long port that looks like it takes up about as much volume as the cavity. Almost like a transmission line, but not quite... Kind of like a hybrid between transmission line and ported box.

djronbxs · 20th November 2007, 09:53 PM

so for a resonant cavity what are the tuning formulas ?

lne937s · 21st November 2007, 01:11 AM

look at a vented box.

Consider it a really long port...

http://www.geocities.com/f4ier/vented.htm

19th November 2007, 02:12 PM	#1
djronbxs diyAudio Member Join Date: May 2006	Bose acoustimass Hi, how does bose produce that sound with that small drivers and enclosure ? is it a transmission line or those it have some electronics inside to produce the sound like that ? thanks

19th November 2007, 02:41 PM	#2
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! Assuming you're referring to the bass module, yes to both: http://www.bose.com/controller?event...am_am16_15.jsp The satellite speakers are heavily EQ'd custom single drivers in a tiny sealed alignment. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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19th November 2007, 03:19 PM	#3
linuxguru diyAudio Member Join Date: Sep 2007	At the risk of stating the obvious, there are far better-sounding satellites than the 2" satellites of Bose Acoustimass, at a fraction of the cost. In particular, the well-known silent gap between 200 to 280 Hz that exists in Bose Acoustimass satellites can easily be filled by using inexpensive (<$10) 3" full-ranges. For instance, check out the Zaph Audio bookshelves with 3" HiVi drivers: http://www.zaphaudio.com/audio-speaker18.html For the main Bose Acoustimass Bass unit, it is easily surpassed by a whole lot of designs that use a single, larger driver - starting at ~5.25" and higher. The 8" Pioneer BF20FU20 "Bofu" full-range driver at $25 is the best example, but there are numerous others. The only thing going for Bose is the WAF (Wife Acceptance Factor) of small and inconspicuous components. But there's a price to be paid for that - which is poor sound quality.

19th November 2007, 08:22 PM	#4
djronbxs diyAudio Member Join Date: May 2006	but the acoustimass is a transmission line or what ?

19th November 2007, 09:20 PM	#5
lne937s diyAudio Member Join Date: Dec 2004 Location: New York City	The "acoustimass" module is not a transmission line, but rather a bandpass box- the order of which depends on the model. These enclosures increase output in a narrow range. It uses this combined with EQ and emphasizes frequencies that people are sensitive to (80-100Hz) rather than attempting to play low bass frequencies (20-40Hz) Sixth order bandpass: http://www.carstereo.com/help/Articles.cfm?id=32 http://www.intellexual.net/bose.html http://www.greengart.com/Columns/col...n%205%20Update

20th November 2007, 06:37 AM	#6
djronbxs diyAudio Member Join Date: May 2006	but the latest acoustimass subwoofer are not indise the encolure there are two under the box facing the floor

20th November 2007, 02:26 PM	#7
lne937s diyAudio Member Join Date: Dec 2004 Location: New York City	I found what you are talking about... Well, it has a resonant cavity and a very long port that looks like it takes up about as much volume as the cavity. Almost like a transmission line, but not quite... Kind of like a hybrid between transmission line and ported box.

20th November 2007, 09:53 PM	#8
djronbxs diyAudio Member Join Date: May 2006	so for a resonant cavity what are the tuning formulas ?

21st November 2007, 01:11 AM	#9
lne937s diyAudio Member Join Date: Dec 2004 Location: New York City	look at a vented box. Consider it a really long port... http://www.geocities.com/f4ier/vented.htm