and the
If this type of software is not available, assistance is available through JBL‘s Web site at www.jbl.com or from your autho- rized JBL dealer.
Your Car And
The BASS Made In It
Depending on the size of the vehi- cle, bass frequencies below 50Hz or 80Hz are actually boosted by nearly 12dB per octave as the frequency decreases. If you wanted to purchase that kind of power, you would need an ampli- fier that was eight times more powerful than the one you have. You can either reduce bass level to compensate for this, or simply sit back and enjoy the “free” bass.
Enclosure Calculation and Building
Recommended box designs are available from your JBL Dealer, or at www.jbl.com on the Internet. You may choose cabinet dimensions to fit your car, but the internal volume must not be changed, since changes in inter- nal volume will change the tuning frequency of the enclosure. Please contact your authorized JBL dealer if you cannot do
the necessary calculations your- self. The JBL Speakershop™ dedicated
Sealed enclosures exert the most
control over the motion of a sub- 03 woofer because the air acts like a
spring against the motion of the woofer cone. Larger boxes allow for more excursion, thus more sound output for the amount of power used. When placed in a sealed box larger than the rated compliance (Vas) of the sub- woofer, it will react as if it were in an infinite baffle installation.
Vented and bandpass enclosures have the lowest amount of excur- sion for the amount of sound out- put. This is a result of port tuning reinforcing the sound output.
Vented boxes will not provide adequate woofer control when driven below the port tuning range, meaning proper design is important. A