Soundstream SPL 170 Owner's Manual And Installation Manual page 3

Vented (Continued)
3
4.5 ft @ 25 Hz (Two
105
100
4" x 16" ports) -
95
90
D e s i g n e d f o r
85
80
thunderous home
75
70
theater bass. Use with
65
60
55
20 Hz high pass filter
50
10
for very high power
handling.
Sealed Bandpass
105
100
95
3
90
Rear = .87 ft sealed
85
80
3
Front = 1.5 ft @ 75
75
70
Hz (Five 4" x 10"
65
60
ports) - Very high 55
50
o u t p u t i n t i n y 10
enclosure. Great for
SPL vehicles -- 102
dB with 2.83 volts
105
input! Response
100
95
limited to 45 to 100
90
85
Hz.
80
75
70
65
3
60
Rear = 1.2 ft sealed
55
50
3
Front = 1.5 ft @ 62
10
Hz (Three 4" x 10"
ports) - High output
with response to 35
Hz. Good enclosure
105
100
for Rock and Rap
95
90
music. 100 dB with
85
80
2.83 volts input.
75
70
65
60
55
3
Rear = 2 ft sealed
50
10
3
Front = 1.5 ft @ 53
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
100 1000
Frequency Hz
Vented (V)
100 1000
Frequency Hz
Sealed
Bandpass
(SBP)
100 1000
Frequency Hz
100 1000
Frequency Hz
10
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.
ALUMINUM
COOLING
PLATES
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.
Footnote: The Physics of Heat Transfer
Heat energy, q, radiated between two bodies is determined by the formula:
q =
1-2
An important part of this equation is which is the "emissivity". The larger is, the more heat
transfer takes place. is largest for a black surface (1.0). That's why wood stoves and car
radiators are painted black.
A F T T
3