DP Tool Club 26/CD_ASCQ_26_1295.iso/vrac/blaubox1.zip/BB63.ASC

Text File | 1992-04-25 | 2KB | 36 lines

BOX STYLE discusses the various styles that can be used in
a given installation and the pro's and con's of each.

1. A sealed box is simple to build, will take lots of pow-
   er because of the sealed box's "air spring," and sounds
   reasonably good in most installations.  But, the -3db
   frequency is much higher than a vented box.  This is
   the best design for "beginners" but also for many
   installers unsure of woofer box theory.
2. A vented box will often play much lower than a sealed
   box but the woofer can become unloaded and begin to
   move excessively below its -3db frequency because of
   the lack of an "air spring" as in the sealed box.
3. The single vented bandpass box is a fantastic box in
   many ways because it offers a sealed chamber on one
   side of the woofer ( therefore an air spring ) and a
   vented chamber on the other ( therefore a lower -3db
   frequency ).  But, it is a more complicated box to
   build and is less tolerant to BoneHead construction
   mistakes such as air leaks.
4. The double vented bandpass box offers even lower
   frequency response, and higher efficiency than a simple
   vented box, but, like a vented box, the woofer becomes
   unloaded at some low frequency and begins to flop
   around.  The biggest problem with this design is the
   very complex and unforgiving construction techniques
   which are required.
5. The fifth-order single vented bandpass box is very
   similar to the single vented bandpass box but requires
   the use of an inductor in series with the woofer.
   The inductor increases the rate of the high frequency
   rolloff of the system.

More information and examples on this subject are in the
BLAUBOX user's manual.