Soundstream Technologies Speaker SPL 170 User Manual

SPL  
170  
Subwoofer  
OWNER'S MANUAL AND  
INSTALLATION GUIDE  
SOUNDSTREAM TECHNOLOGIES  
120 Blue Ravine Road · Folsom · California 95630 USA  
tel 916.351.1288 fax 916.351.0414  
(REV A, 7/22/97)  
 
Vented (Continued)  
· 4.5 ft3 @ 25 Hz (Two  
105  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
HEAT TRANSFER AND THE  
SPL170 -- 30 % BETTER COOLING  
4"  
x
16" ports)  
-
D e s i g n e d  
thunderous  
f o r  
home  
One of the major features of the SPL170 is its incorporation of materials and coatings to  
provide transfer and elimination of heat.  
theater bass. Use with  
20 Hz high pass filter  
for very high power  
handling.  
10  
100  
1000  
·
·
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.  
Frequency Hz  
Vented (V)  
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.  
Sealed Bandpass  
105  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
·
·
Rear = .87 ft3 sealed  
Front = 1.5 ft3 @ 75  
ALUMINUM  
COOLING  
PLATES  
Hz  
(Five 4" x 10"  
ports)  
o u t p u t  
-
Very high  
i n tiny  
10  
100  
1000  
Frequency Hz  
enclosure. Great for  
SPL vehicles -- 102  
dB with 2.83 volts  
Sealed  
Bandpass  
(SBP)  
105  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
input!  
Response  
limited to 45 to 100  
Hz.  
·
·
Rear = 1.2 ft3 sealed  
Tests show almost 30% improved heat transfer from the 170’s voice coil. This produces a  
dual benefit to power handling and output:  
Front = 1.5 ft3 @ 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.  
10  
100  
1000  
Frequency Hz  
1. More power handling before voice coil meltdown.  
2. Reduced electrical resistance in the voice coil windings resulting in more current flow  
capability.  
105  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
Footnote: The Physics of Heat Transfer  
·
·
Rear = 2 ft3 sealed  
Front = 1.5 ft3 @ 53  
10  
100  
1000  
Frequency Hz  
Heat energy, q, radiated between two bodies is determined by the formula:  
q1-2 = s eA1F1-2(T14-T24)  
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  
An important part of this equation is e which is the “emissivity”. The larger e is, the more heat  
transfer takes place. e is largest for a black surface (1.0). That’s why wood stoves and car  
radiators are painted black.  
10  
3
 
SPECIFICATIONS & THIELE/SMALL PARAMETERS  
SUGGESTED ENCLOSURES  
Infinite Baffle  
25-500  
96 dB  
2/8  
Frequency Response (Hz)  
Sensitivity (2.83v/1m)  
Impedance (nominal Z, ohms)  
Rated Program Power, Watts  
Fs (Hz)  
· Excellent performance for all types of music at moderate levels  
100  
Sealed  
95  
800  
· 1.0 ft3 - Great all  
90  
85  
80  
around performing  
26.2  
.371  
7.43  
.390  
67.1  
6.36  
180  
75  
70  
box. Very small  
enclosure. Good for  
Rock and Rap.  
65  
Qts  
60  
55  
50  
Qms  
10  
100  
1000  
Frequency Hz  
Qes  
Sealed  
· 2.0 ft3 - Slightly deeper  
response. Strong  
bass at 20 Hz in car.  
Good for Rock, Rap  
and Jazz.  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
Efficiency Bandwidth Product (Fs/Qes)  
Vas (ft3)  
Vas (liters)  
Vas (m3)  
.180  
160  
10  
100  
1000  
Frequency Hz  
Cms (um/N)  
2.24  
2.475  
14.75  
131.0  
.089  
890  
DCR (ohms)  
Levc (mH) @ 1 KHz  
105  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
BL (Tesla m)  
Vented  
Sd (in2)  
· 2.0 ft3 @ 40 Hz (Two  
4" x 13.5" ports) - Very  
strong output from 40  
Hz to 100 Hz.  
Sd (m2)  
Sd (cm2)  
10  
100  
1000  
Suggest using high  
pass filter near 40 Hz  
for maximum power  
handling and output.  
Very small enclosure.  
9.5  
X max; one way (linear mm)  
X max; one way (peak mm)  
Vd (linear cm3)  
Frequency Hz  
Vented (V)  
27  
847  
105  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
· 3.2 ft3 @ 28 Hz (Two  
4" x 18.5" ports) - Very  
strong output to 30 Hz.  
Good for home theater  
or accurate bass in  
Vd (peak cm3)  
2403  
0.000847  
0.002403  
230  
Vd (linear m3)  
Vd (peak m3)  
10  
100  
1000  
Mms (grams)  
Frequency Hz  
358  
Magnet Assembly (oz)  
118  
Magnet Weight (oz)  
9
Vf (volume of frame, in
3
)  
385  
 
BUILDING THE ENCLOSURE  
SELECTING AN ENCLOSURE  
There are several different enclosure designs for different applications.  
The SPL subwoofers work very well in all the following enclosure  
designs. It is up to you to select the specific enclosure that will work  
the best for your particular application.  
· Determine the dimensions of your enclosure.  
· Be certain the box you have designed will fit into the location you have  
chosen. Sometimes making a cardboard box with the same outside  
dimensions is helpful.  
Infinite Baffle  
Infinite baffle is the simplest type of subwoofer installation. In this type  
of installation, the woofer(s) is mounted to a baffle which is then  
mounted to either the rear deck or back seat of the vehicle. The best  
results are achieved when the trunk area is virtually airtight and  
isolated from the passenger compartment.  
· Use 3/4 inch thick Medium Density Fiberboard (MDF) or High Density  
Particleboard. It is preferable to cut the wood with a table saw to ensure  
straight, even joints. If a table saw is not available, a circular saw is  
acceptable.  
· Use a “T” square to verify precise right angle gluing.  
Pros  
Cons  
· Use a high quality wood glue and air nails or wood screws to assemble the  
enclosure. Elmer’sâ woodworker’s glue and Weldwoodâ work well. To  
guarantee an airtight box, seal each inside joint with silicone sealant.  
· Excellent low frequency extension  
· Excellent transient response  
· Uses almost no trunk space  
· Lower power handling  
· Low to medium efficiency  
· For Sealed Enclosures, stuff the chamber with 50-75% filling (approximately  
1.5 pounds per cubic foot) of fiberglass insulation or Dacronâ .  
Sealed Enclosure  
· For Vented Enclosures, staple 1 inch thick fiberglass insulation or Dacron to  
Sealed enclosures are relatively simple to build and install, as all that is  
required is an airtight box. The larger the sealed enclosure, the more  
the performance resembles that of an infinite baffle installation.  
all walls of the enclosure except the baffle to which the woofer is mounted.  
· Use the supplied gasket to seal the woofer in the enclosure and eight(8)  
wood screws or T-nuts and bolts. Progressively tighten each of the bolts or  
screws to prevent warping the woofer frame.  
Pros  
Cons  
· Very good low frequency  
extension  
· Medium efficiency  
· Use slide-on connectors to attach speaker wires. Do not solder wires to the  
· Very good transient re-  
sponse  
· High power handling  
SUGGESTED ENCLOSURES  
The following designs include a variety of enclosure sizes and types.  
Each design has two frequency response curves; one showing predicted  
“In-Car” response, and the other showing “Half-Space Anechoic” (out-of-car)  
frequency response. The performance difference between the two curves is a  
result of the natural acoustics of an “average” automotive environment. This  
“average” transfer function is only an approximation of what you may expect to  
see in your car. Every car is different. Each curve was generated using 2.83  
Volts across both voice coils in parallel and measured at 1 meter. Also, each  
frequency response curve includes a 12 dB/octave low pass at 100 Hz for  
sealed and vented enclosures and 200 Hz for bandpass enclosures. The  
response curves can help you visualize relative performance differences  
between designs. Read through the descriptions given for each enclosure and  
select the one that suits your needs.  
Sealed  
Vented Enclosure  
Vented enclosures use a sealed enclosure with a vent or port in the box  
which is tuned to resonate at a specific frequency.  
Pros  
Cons  
· Good low frequency exten- · Low power handling  
sion down to the tuning fre-  
quency  
below the tuning fre-  
quency  
· High power handling down · Almost no output  
to the tuning frequency  
· Higher output than sealed  
enclosures  
below the tuning fre-  
quency  
Remember: all suggested enclosure volumes are Net, and DO NOT include  
woofer, port, and bracing displacement!  
Vented (V)  
8
5
 
ENCLOSURE VOLUME FLOWCHART  
Sealed Bandpass Enclosure  
Sealed bandpass enclosures enclose both sides of the woofer(s). An  
airtight enclosure is built around the front and back of the woofer and  
one chamber is ported to a specific frequency.  
Measure maximum possible dimensions  
Pros  
Cons  
Multiply wall thickness by 2  
· High power handling  
within the operating  
frequencies  
· Low power handling  
beyond the tuning  
frequency  
· Very high output within · Poor to moderate  
the range of the oper-  
ating frequencies  
transient response  
· Poor low frequency  
extension  
Subtract this from each dimension to  
arrive at Gross Internal Dimensions  
Sealed  
Bandpass  
(SBP)  
Multiply LxWxD to arrive at  
Gross Internal Volume  
CALCULATING (NET) INTERNAL ENCLOSURE VOLUMES  
When constructing any type of enclosure, you must be aware that the  
outside dimensions DO NOT represent the true (Net) volume inside.  
Such things as woofers, ports, thickness of enclosure material, dividing  
walls, and any internal bracing will reduce the total amount of the  
actual air space available. The following worksheet has been designed  
to provide you with the necessary steps to accurately calculate the  
absolute (Net) internal volume of any given enclosure.  
Deduct Vf (volume of the speaker frame)  
from Gross Internal Volume  
Braces?  
Calculating Cylindrical Port Volume  
No  
Yes  
1. Measure the outside diameter of the port and divide by 2 for the  
radius.  
2. Square the radius and multiply by 3.14 (p) to arrive at outside port  
Calculate brace volume and deduct  
from Gross Internal Volume  
area.  
3. Multiply the area by the length of the port inside the enclosure for  
To convert to LITERS:  
Divide in3 by 61.03  
the port volume.  
You are at Net Internal Volume  
in cubic inches (in3 )  
To convert to CUBIC FEET:  
Divide in3 by 1728  
length inside  
enclosure  
outside  
diameter  
6
7
 

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