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bass reflex box design


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prodigal 
Copper - Posts: 62
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Joined: April 07, 2006
Location: Saint Lucia
Posted: December 20, 2007 at 2:11 PM / IP Logged  
I've seen this design a few times and it really seems to produce impressive bass results in both loudness and quality. I'm not familiar with posting diagrams so i'll use 0s to create the design of the box:
0000000000000000000000000000000000000 0                                   0 00000000000000000000000000          0 0                                   0 0          00000000000000000000000000 0                                   0 00000000000000000000000000          0 0                                   0 0          00000000000000000000000000 0                                   0 0         00000000000               0 0        0           0              0 0       0   SPEAKER   0             0 0000000000000000000000000000000000000
This design basically creates a kind of maze behind the speaker. What is this design, How does it work, What are the advantages and disadvantages of this design? Any particulars about design a box of this design? Thanks.
Prodigal Son
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: December 20, 2007 at 2:59 PM / IP Logged  
Bass reflex = ported system.  Assuming there is an exit in the top left corner of your diagram, all that represents is a long port.  If there is no exit from the enclosure, then it is simply a sealed (acoustic suspension) system.
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audiocableguy 
Copper - Posts: 630
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Joined: January 27, 2003
Location: Idaho, United States
Posted: December 20, 2007 at 6:56 PM / IP Logged  
If the port exit is at the upper left, looks to be a transmission line.
prodigal 
Copper - Posts: 62
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Joined: April 07, 2006
Location: Saint Lucia
Posted: December 20, 2007 at 7:46 PM / IP Logged  
yes it is a ported system. I've seen this design used in ready made sub enclosures. What are the advantages of this enclosure design? I've noticed that with this design the port can span the length of the box with this design. I've been told that the partitions in this design are best at 2 inches apart. The nautilas (hope i spelled it right is an expensive system of speakers noted for quality. It's design is like that of a snail shell. Can i assume that these long ports have a greater advantage to them?
Prodigal Son
audiocableguy 
Copper - Posts: 630
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Posted: December 20, 2007 at 7:59 PM / IP Logged  
transmission line . . .The tapering tube can be coiled for lower frequency driver enclosures to reduce the dimensions of the speaker resulting in a seashell like appearance. Most notably Bowers & Wilkins have used this approach in their flagship Nautilus speaker as well as the use of smaller straight tapering tubes in many of their other lines.
audiocableguy 
Copper - Posts: 630
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Posted: December 20, 2007 at 8:56 PM / IP Logged  
In a previous post "transmission line", haemphyst did an excellent job explaining the benifits. My last post came from an article from wikipedia about different types of enclosures.
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: December 20, 2007 at 10:39 PM / IP Logged  
It's not a transmission line if the size of the port remains constant.  If it is the same size from start to finish, it is a bass reflex enclosure.
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audiocableguy 
Copper - Posts: 630
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Posted: December 20, 2007 at 10:51 PM / IP Logged  
haemphyst did mention this:
A port is just a device to tune an enclosure to a given resonance. Remove the enclosure, and buld the port SO big, that you can stick the woofer on the end of it, and there you are - a TL. Oversimplified, certainly, but basically... Instead of an air pump moving air through it, it's a speaker moving air through it.
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: December 21, 2007 at 9:53 AM / IP Logged  
Yes, a "speaker at the end of a long tube" can be stuffed and tuned like a transmission line.  A true TL uses a tapered line, with the TQWT approach being most common.
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aznboi3644 
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Posted: December 22, 2007 at 3:58 PM / IP Logged  
DYohn wrote:
Yes, a "speaker at the end of a long tube" can be stuffed and tuned like a transmission line. A true TL uses a tapered line, with the TQWT approach being most common.
DYohn, from reading the material from quarter-wave.com a transmission line can have a taper or a 1-1 area ratio throughout the line
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