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10
Sealed
Bandpass
(SBP)
Vented (Continued)
• 4.5 ft
3
@ 25 Hz (Two
4" x 16" ports) -
Designed for
thunderous home
theater bass. Use with
20 Hz high pass filter
for very high power
handling.
Sealed Bandpass
• Rear = .87 ft
3
sealed
• Front = 1.5 ft
3
@ 75
Hz (Five 4" x 10"
ports) - Very high
output in tiny
enclosure. Great for
SPL vehicles -- 102
dB with 2.83 volts
input! Response
limited to 45 to 100
Hz.
• Rear = 1.2 ft
3
sealed
• Front = 1.5 ft
3
@ 62
Hz (Three 4" x 10"
ports) - High output
with response to 35
Hz. Good enclosure
for Rock and Rap
music. 100 dB with
2.83 volts input.
• Rear = 2 ft
3
sealed
• Front = 1.5 ft
3
@ 53
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105
10 100 1000
Frequency Hz
dB
SPECIAL APPLICATION NOTE:
The three enclosures above have been designed with flexibility in mind. One
single enclosure could be constructed to utilize all three response curves. An
adjustable rear volume and port "covers" could allow use of all three
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55
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105
10 100 1000
Frequency Hz
dB
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10 100 1000
Frequency Hz
dB
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10 100 1000
Frequency Hz
dB
Vented (V)
3
Footnote: The Physics of Heat Transfer
Heat energy, q, radiated between two bodies is determined by the formula:
q
1-2
= σεA
1
F
1−2
(T
14
−T
24
)
An important part of this equation is ε which is the “emissivity”. The larger ε is, the more heat
transfer takes place. ε is largest for a black surface (1.0). That’s why wood stoves and car
radiators are painted black.
HEAT TRANSFER AND THE
SPL170 -- 30 % BETTER COOLING
One of the major features of the SPL170 is its incorporation of materials and coatings to
provide transfer and elimination of heat.
• When heat is produced in the voice coil, it must be removed. During speaker operation,
heat from the voice coil is radiated and convected into the air and metal in the motor
parts.
• The SPL170 includes unique aluminum plates attached to the top, pole and back plates
to increase heat conduction from the steel parts. Additionally, the steel parts are black
coated to increase their ability to absorb heat from the voice coil.
Tests show almost 30% improved heat transfer from the 170’s voice coil. This produces a
dual benefit to power handling and output:
1. More power handling before voice coil meltdown.
2. Reduced electrical resistance in the voice coil windings resulting in more current flow
capability.
ALUMINUM
COOLING
PLATES