Description

This article is from the Car Audio FAQ, by Ian D. Bjorhovde (ianbjor@mobileaudio.com) with numerous contributions by others.

4.4.4 Bandpass Box

* Advantages...
- When properly designed and implemented, can provide
superior LF extension and efficiency.

- Cone motion is controlled more and therefore mechanical
power handling is increased.

- Cones are physically protected from contents of trunk
flying around.

- Output is easily channeled directly into the interior
of sedans.

* Disadvantages...
- Difficult to build (not recommended for newbies), and
very sensitive to misalignment due to calculation or
construction errors.

- Their characteristic filtering often masks any
distortion that occurs as a result of amplifier clipping or
overexcursion and thus will give the user no warning that the
driver is over-stressed and about to fail.

- Need substantial mid-bass reinforcement to make up for
narrow bandwidths in efficient alignments.

- Transient response is largely dependent upon the
alignment chosen....wider bandwidths will result in sloppier
performance, narrower bandwidths (and thus higher effiencies)
result in better transient performance.

- They can oft times be quite large.

Continue to:

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• next: 4.5 How do I build an enclosure? [AO]