Soundstream spl-mule User Guide
6
Measure maxim um possible dim ensions
Multiply wall thickness by 2
Subtract this from each dimension to
arrive at Gross Internal Dimensions
arrive at Gross Internal Dimensions
Multiply LxW xD to arrive at
Gross Internal Volume
Deduct Vf (volum e of the speaker frame)
from Gross Internal Volum e
Braces?
N o
Yes
C alculate brace volum e and deduct
from G ross Internal Volume
Deduct Vf (volum e of the speaker frame)
from Gross Internal Volum e
You are at N et Internal Volum e
in cubic inches (in )
3
To convert to LITERS:
Divide in
Divide in
by 61.03
To convert to C UBIC FEET:
Divide in
Divide in
by 1728
3
3
ENCLOSURE VOLUME FLOWCHART
3
CAVITY RESONANCE TUNING AND POWER HANDLING IN THE MULE
One of the unique features designed into the SPL Mule is an ability to play
extremely loud when installed in a typical vehicle. Its peak output frequency
and Q (Quality Factor) are targeted toward the “Cavity Resonance” of a car’s
passenger compartment.
Resonance occurs when a body (e.g., an enclosed volume of air) capable of
producing sound receives impulses at one of its fundamental or harmonic
frequencies. If, for example, a car has a fundamental resonance of 65Hz, a
loudspeaker with high output at that frequency will excite the metal at the
resonance and produce sound in addition to the speaker.
Another Mule design feature is improved heat transfer. Aluminum heat sinks
and steel plates with high emissivity coatings extract heat from the voice coil.
By providing a path for heat in the voice coil, we not only allow it to accept
more wattage but also reduce its electrical resistance and allow higher current
flow. The effect is higher power handling and more output.
The Mule is also designed to operated effectively in a small enclosure. An
example would be an installation of 16 Mule drivers which could be
accomplished within a space just a bit larger than 4ft by 4ft by 1ft deep!
16 Mules would produce tremendous output. Since sound pressure level
increases by 6dB every time you double the number of drivers, the system
would produce 24dB more output than a single Mule at the same power/
extremely loud when installed in a typical vehicle. Its peak output frequency
and Q (Quality Factor) are targeted toward the “Cavity Resonance” of a car’s
passenger compartment.
Resonance occurs when a body (e.g., an enclosed volume of air) capable of
producing sound receives impulses at one of its fundamental or harmonic
frequencies. If, for example, a car has a fundamental resonance of 65Hz, a
loudspeaker with high output at that frequency will excite the metal at the
resonance and produce sound in addition to the speaker.
Another Mule design feature is improved heat transfer. Aluminum heat sinks
and steel plates with high emissivity coatings extract heat from the voice coil.
By providing a path for heat in the voice coil, we not only allow it to accept
more wattage but also reduce its electrical resistance and allow higher current
flow. The effect is higher power handling and more output.
The Mule is also designed to operated effectively in a small enclosure. An
example would be an installation of 16 Mule drivers which could be
accomplished within a space just a bit larger than 4ft by 4ft by 1ft deep!
16 Mules would produce tremendous output. Since sound pressure level
increases by 6dB every time you double the number of drivers, the system
would produce 24dB more output than a single Mule at the same power/
Wall of Mules:
Each individual enclosure
measures 12” W x 12” H x 10½” D
inside for a net internal volume
of .745 ft
measures 12” W x 12” H x 10½” D
inside for a net internal volume
of .745 ft
3
.
External dimensions of the multiple
driver enclosure are 51¾” W x 51¾”H
x 12”D
51
3
/4
"
51 3/4"