Soundstream Technologies SPL 15, SPL 160 User Manual

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UNDSTREAM’

E C H N 0 L 0 G i E S

SOUNDSTREAM TECHNOLOGIES

120

Blue Ravine Road

tel 916.351 .I 288

Folsom l California

fax

916.351.0414

95630

USA

(REV A,

7/22/97)

)

I t

.’

Subwoofers

OWNER’S MANUAL AND

INSTALLATION GUIDE

UNDSTREAM@

SPL15 and SPL160 SUBWOOFER

CONGRATULATIONS! You have chosen a superior product for

reproducing high levels of "Sound Pressure Level" in the car. This precision component, when properly installed, is capable of amazing output performance. The SPL15 and SPL160 woofers are well-suited for sealed, vented, and sealed bandpass enclosures. They also work well in infinite baffle installations at one-half the power rating.

Should your woofer ever require service or replacement, recording the information below for your own records will help protect your investment.

Model Number:___________________________________________________________ Serial Number: ___________________________________________________________ Dealer’s Name: __________________________________________________________ Date of Purchase: ________________________________________________________ Installation Shop: _________________________________________________________ Installation Date: _________________________________________________________

DESIGN FEATURES

• Long Excursion Design -- The SPL woofers use high performance components and the

New Ultra-Excursion Surround to achieve extra long excursion for high output and deep bass.

• Heavy Cast Aluminum Basket on the SPL160 and Heavy Gauge Steel Basket on the

SPL15 provide extra rigidity and damping.

and home theater applications.

SUGGESTED ENCLOSURES (Continued)

Sealed Bandpass

• Enclosure #56

• Rear = 4.7 ft

Front = 3.5 ft3 @ 50 Hz (Four 4" x 7.5" ports) - Very high

output for Rock or Rap music.

sealed

• Enclosure #57

• Rear = 2.8 ft

Front = 2.3 ft3 @ 61 Hz (Three 4" x 5.25" ports)- Very high output with good

low frequency extension. Good for Rock or Rap music.

sealed

• Enclosure #58

• Rear = 1.5 ft

• Front = 2.3 ft

Rap music.

sealed

@ 75Hz (Four 4" x 3.5" ports) - Super high output. Great for

• Textured Blue Powder Coating ensures durability and lasting superb good looks.

• Ultra-High power handling Voice Coil with Glass Polymide Former increases power

handling and performance. Aerospace grade adhesives and materials insure longevity and high performance.

• Dual Voice Coil Inputs for increased flexibility in optimizing installations.

• Computer Numerically Controlled (CNC) machined magnet plates and pole piece

precisely focus the magnet energy for optimum performance.

• High Emissivity Coatings on pole and top plates improve power handling.

• Double Magnet Structures for powerful, well-controlled output.

• Vented Pole Piece for greater voice coil cooling.

• Custom-designed High Strength Spider controls the long travel cone assembly.

• Gold Plated 8 Gauge Terminals ensure consistently outstanding connectivity for cable

SPECIAL DESIGN FEATURES!

• Custom-designed Cast Frame Basket for deep excursion and precise

alignment of the voice coil.

• Custom chrome top and back plates for show-quality installations in any

vehicle!

• Nearly 2 1/2" peak-to-peak maximum excursion for producing awesome

sound levels with just a single woofer!

Infinite Baffle

• Excellent performance for all types of music at moderate levels

Sealed

• 1.5 ft

• 2.0 ft

Vented

• 3.0 ft

• 4.0 ft

- Good linear response, excellent small enclosure.

Excellent for high SPL, multiple driver applications.

- Good response, excellent all around enclosure.

@ 27 Hz (Two 4" x 22" ports) - High output with good

low frequency extension. Good small enclosure.

@ 32 Hz (Three 4" x 16" ports) - High output with

excellent low frequency extension. Great for Rock music

Preliminary

SPECIFICATIONS & THIELE/SMALL PARAMETERS

Frequency Response (Hz) Sensitivity (2.83v/1m) Impedance (nominal Z, ohms) Rated Program Power, Watts Fs (Hz) Qts Qms Qes Vas (ft3) Vas (liters) Vas (m3) Cms (um/N) DCR (ohms) Levc (mH) @ 1 KHz BL (Tesla m) Sd (in2) Sd (m2) Sd (cm2) X max; one way (linear mm) X max; one way (peak mm) Vd (linear cm3) Vd (peak cm3) Vd (linear m3) Vd (peak m3) Mms (grams) Magnet Assembly (oz) Magnet Weight (oz) Vf (volume of frame, in3) Coil length (mm)

25-500 25-500

95 dB 96 dB

2 2

400 800

25 28

.33 .33

6.80 7.82 .35 .35

7.98 7.24

226 205

.226 .205

201 183

1.68 2.01

1.02 .67

12.4 13.3

131.0 131.0 .0845 .0845

845 845

7.0 10.0

22 22

592 845

1859 1859

0.000592 0.000845

0.001859 0.001859 206 173 238 345 104 157 320 385

27.9 28.6

SELECTING AN ENCLOSURE

VENTED

Sealed Bandpass (SBP)

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.

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.

Pros Cons

• Excellent low frequency extension

• Excellent transient response

• Uses almost no trunk space

Sealed Enclosure

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.

Pros Cons

• Very good low frequency extension

• Very good transient response

• High power handling

• Medium efficiency

• Lower power handling

• Low to medium efficiency

SUGGESTED ENCLOSURES (Continued)

Sealed Bandpass

• Enclosure #54

• Rear = 2.8 ft

• Front = 2.2 ft

output with good low frequency extension. Good for Rock or Rap.

sealed

@ 55 Hz (Four 4" x 11.5" ports) - High

• Enclosure #55

• Rear = 1.3 ft

• Front = 2.2 ft

for Rap music.

sealed

@ 77Hz (Four 4" x 3.25" ports) - Very high output. Great

Vented Enclosure

Vented enclosures use a sealed enclosure with a vent or port in the box

• Good low frequency extension down to the tuning frequency

• High power handling down to the tuning frequency

• Higher output than sealed enclosures

Pros Cons

• Low power handling below the tuning frequency

• Almost no output below the tuning frequency

SEALED

Sealed (S)

Vented (V)

SEALED BANDPASS

SUGGESTED ENCLOSURES

Infinite Baffle

• Excellent performance for all types of music at moderate levels

Sealed

• 1.5 ft

• 2.0 ft

Vented

• 3.25 ft

• 6.7 ft

- Good linear response, excellent small enclosure.

Excellent for high SPL, multiple driver applications.

- Good linear response, excellent all around

enclosure.

@ 27 Hz (Two 4" x 19.75" ports) - High output with

good low frequency extension. Good small enclosure.

@ 21 Hz (Two 4" x 15" ports) - High output with

excellent low frequency extension. Great for Rock music or home theater applications.

which is tuned to resonate at a specific frequency.

Sealed Bandpass Enclosure

Sealed bandpass enclosures enclose both sides of the woofer(s). An airtight enclosure is built around the front and back of

Pros Cons

• High power handling within the operating frequencies

• Very high output within the range of the operating frequencies

• Low power handling beyond the tuning frequency

• Poor to moderate transient response

• Poor low frequency extension

the woofer and one chamber is ported to

a specific frequency.

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.

Calculating Cylindrical Port Volume

1. Measure the outside diameter of the port and divide by 2 for the radius.

2. Square the radius and multiply by 3.14 (π) to arrive at outside port area.

3. Multiply the area by the length of the port inside the enclosure for the port volume.

length inside

enclosure

outside diameter

ENCLOSURE VOLUME FLOWCHART

M easure maximum possible dimensions

M ultiply wall thickness by 2

Subtract this fr om each dimension to arr ive at Gross Internal Dimensions

M ultiply LxWxD to arrive at

Gross Internal Volume

BUILDING THE ENCLOSURE

• 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.

• 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.

• Use a high quality wood glue and air nails or wood screws to assemble the

enclosure. Elmer’s woodworker’s glue and Weldwood work well. To guarantee an airtight box, seal each inside joint with silicone sealant.

• For Sealed Enclosures, stuff the chamber with 50-75% filling (approximately

1.5 pounds per cubic foot) of fiberglass insulation or Dacron.

Deduct Vf ( volume of the speaker frame)

from Gross Inter nal Volume

Braces?

No Yes

Calculate brace volume and deduct

from Gross Inter nal Volume

You ar e at Net Internal Volume

in cubic inches ( in )

To conver t to LITERS:

Divide in by 61.03

To conver t to CUBIC FEET:

Divide in by 1728

• For Vented Enclosures, staple 1 inch thick fiberglass insulation or Dacron to

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.

• Use slide-on connectors to attach speaker wires. Do not solder wires to the

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 2.0 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. 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.

Remember: all suggested enclosure volumes are Net, and DO NOT include woofer, port, and bracing displacement!

Soundstream Technologies SPL 15, SPL 160 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual