Rockford Fosgate Speaker S1 408 User Guide

Series 1  
WOOFERS  
S1-408  
S1-410  
S1-412  
S1-415  
S1-808  
S1-810  
S1-812  
S1-815  
O W N ER' S MAN U AL  
 
TABL E O F C O N T E N T S  
Series 1 Woofer Contents .................................................................. 1  
Introduction ...................................................................................... 1  
Design Features................................................................................. 1  
Voice Coil ................................................................................... 1  
Vented Pole Piece ....................................................................... 1  
PVA Treated Cone ....................................................................... 1  
Suspension .................................................................................. 2  
Dual Input Terminals................................................................... 2  
Low Frequency Speaker Systems ....................................................... 2  
Using the Series 1 Woofer ................................................................. 2  
Calculating Load Impedance ............................................................. 3  
Calculating Volume .......................................................................... 3  
Building An Enclosure ....................................................................... 4  
Specifications .................................................................................... 5  
Warranty Information ........................................................................ 6  
 
SERIES 1 WOOFER CONTENTS  
Series 1 Woofer  
Owner's Manual  
IN T RO D U C T I O N  
This manual contains information on the construction, installation  
and operation ofthe Series1 low frequencyspeakers. We recommend  
you keep this manual for future reference.  
The Series 1 Woofers are a full line of low frequency drivers ranging  
in size from 8" to 15" in diameter. System compatibility is ensured by  
offering each size at four and eight ohm impedance. Designed to offer  
Rockford Fosgate quality in an affordable speaker, the Series 1  
Woofers offer the beginning car stereo enthusiast an opportunity to  
enjoy solid low frequency music reproduction. Our engineers have  
selected materials and techniques used in building our speakers  
which offer performance and reliability comparable to other speakers  
selling for much more.  
D E SI G N FE AT U R E S  
The following section describes the methods used in constructing the  
Series 1 Woofers and how each was optimized.  
Black Anodized Aluminum Voice Coil Former – To improve the  
reliability of the voice coil, it is wound on a black, anodized  
aluminum former. Because aluminum is an efficient thermal conduc-  
tor, it keeps heat from concentrating in the voice coil during normal  
use.  
Vented Pole Piece – To allow operation at reasonably high power  
levels, ventilation is needed. This is done through the use of a vented  
pole piece. The venting allows fresh air to circulate and remove the  
built up heat form the voice coil assembly.  
PVA Treated Paper Cone – The cone is constructed from a light-  
weight, rigid paper material. The cone is treated with Polyvinyl  
Acetate which lowers the resonance and reduces distortion. The PVA  
also reduces damage from the harsh environmental conditions typi-  
cal of a car interior.  
1
 
Suspension – The suspension of a speaker is the part of the speaker  
which controls the motion of the cone. This is what changes the  
electrical energy to sound energy. The surround is constructed from  
a dual laminated foam which ensures linear motion of the cone while  
resisting mechanical and environmental damage.  
Dual Input Terminals – To facilitate hook-up in multiple driver  
configurations, each positive and negative terminal has two connect-  
ing lugs. The positive terminal is identified by a dot which also  
indicates the speaker's impedance. A red dot is used on a 8speaker,  
a violet dot on a 4speaker.  
LO W FREQ UENCY SPEAKER SYSTEM S  
The Series 1 Woofers require an enclosure to achieve optimum  
results. The enclosure allows the speaker to operate at lower frequen-  
cies with improved power handling. The two most commonly used  
types of low frequency speaker systems are acoustic suspension and  
bass reflex. The acoustic suspension enclosure, commonly referred to  
as a sealed box, relies upon the changing air pressure in a tightly  
sealed chamber of its operation. The bass reflex, commonly referred  
to as a ported enclosure, uses a vent inserted into the box which takes  
over for the speaker at a desired frequency which is determined by the  
internal volume of the enclosure and the size of the vent used. The  
Series 1 Woofer will yield optimum performance in a ported enclo-  
sure.  
USING THE SERIES 1 WOOFERS  
Speakers are built in different sizes to optimize their performance in  
different frequency bands. Crossovers are used to route the different  
frequency bands for each appropriate speaker. There are two opera-  
tional types of crossover: active and passive. An active crossover is an  
electronic filter which is placed before the amplifier and separates the  
signal fed to different amplifiers in the system. A passive crossover is  
positioned after the amplifier and separates the signal fed to each  
speaker in the system. Active crossovers offer the accuracy and  
flexibility needed for a sophisticated system and are used in complex  
multiple amp designs. Passive crossovers (capacitors and inductors)  
allow the use of multiple speakers in a simple system which can easily  
be expanded over time. We recommend using a 6dB per octave,  
100Hz low-pass crossover for the Series 1 Woofers when used with  
a passive system.  
To customize the installation, try adjusting the crossover point one  
octave up or down to optimize the system staging.  
2
 
CALCULATING LOAD IMPEDANCE  
The Series 1 Woofers are used for the sub-bass region, those frequen-  
cies below 100Hz. This is the foundation for the music and the  
frequency range you feel. Before selecting the passive crossover, it is  
necessary to calculate the load impedance of the speaker system. In  
a series circuit the impedance is determined by the formula:  
R = R + R + R …  
T
1
2
3
In a parallel circuit the impedance is determined by the formula:  
1
1
1
1
=
R
R +R + R …  
T
1
2
3
Where R is the total speaker load and R , R , etc. represent each  
T
1
2
speaker in the system.  
The crossover is connected in line to the positive terminal of the  
speaker system. The crossovers are available from Authorized Rock-  
ford Fosgate Dealers.  
CALCULATING VO LUM E  
Calculating volume is merely a matter of measuring the dimensions  
in inches and using the formula: Volume = Height x Width x Depth.  
The result is in cubic inches. Convert this to cubic feet by dividing by  
1,728 (the number of cubic inches in a cubic foot). If two facing sides  
are of uneven length, add them together and divide by two to get the  
average. Using this number will give you the volume without the  
necessity of calculating the box in sections and adding the sections  
together. The thickness of the baffle material determines the internal  
volume. The speaker itself also reduces the internal volume. The  
amount of air displaced by each model is listed on the specification  
sheet and should also be subtracted from the gross volume calcula-  
tion.  
3
 
BU ILD IN G AN EN C LO SU RE  
To work properly, the walls of the enclosure must be rigid and not flex  
when subjected to the high pressures generated by the speaker's  
operation. We recommend using 3/4" thick high density particle  
board or medium density fiberboard (MDF), which are available at  
most building supply stores. For a large box, internal bracing is  
needed for reinforcement. The joints should be glued, using non-  
flammable carpenter's glue, and secured with either nails or screws.  
Internally the joints should be sealed with silicon to prevent air from  
leaking. Because the high density particle board and MDF are porous  
materials, it is suggested to seal the outside enclosure walls with  
polyurethane. Ideally, the port should be located on the same face as  
the speaker and positioned at least one port diameter away from the  
side and back walls.  
In Conclusion  
Special care has been taken to ensure your satisfaction with the Series 1  
Woofers. The materials and workmanship have been carefully se-  
lected to guarantee performance equal to the needs of the most  
demanding conditions. If you have any further questions or advanced  
system needs, your Authorized Rockford Fosgate Dealer will be  
happy to assist you.  
4
 
5
 
WARRANTY INFORMATION  
Rockford Fosgate warrants all loudspeakers to the original purchaser for a period  
of two (2) years parts and labor, providing the product was purchased from an  
Authorized Rockford Fosgate Dealer. Speakers found to be defective during the  
warranty period will be repaired or replaced (with a product deemed to be  
equivalent) at Rockford Fosgate’s discretion. Repaired or replaced speakers will  
cover the balance of the original warranty period only. Warranty applies only to  
original purchaser and is non-transferable. Warranty does not cover abuse or  
installation error. If a determination is made that the product has been abused or  
is out of the warranty period, it will be repaired, exchanged, and billed. Parts not  
covered underwarrantywillbe repaired orreplaced and billed. Forspeakerboxes,  
please return the speaker only. Serial number must be intact to obtain warranty.  
Speakers must be returned prepaid to Grand Rapids, Michigan.  
GENERAL  
Electronics and speaker warranties do not cover any appearance item, any cost or  
expense related to the removal or reinstallation of the product, any accessory used  
in conjunction with the product, damage to the product resulting from alteration,  
accident, misuse or abuse, or improper installation. This warranty does not apply  
if the parts or labor, which would otherwise be provided without charge under this  
warranty, are obtained from any source other than Rockford Fosgate or an  
Authorized Rockford Fosgate Service Center.  
The warranty is the only express warranty and does not create any implied  
warranties. Rockford Fosgate limits its obligations under any implied warranties  
under state laws to a period not to exceed the written warranty period. Some states  
do not allow limitation on how long an implied warranty lasts, so the above  
limitation may not apply. This warranty applies only to products sold in the United  
States of America or its possessions. For warranty outside the U.S.A., please  
contact the nearest Authorized Rockford Fosgate Dealer. This warranty gives the  
consumerspecific legalrights, and the consumermayhave otherrightswhich vary  
from state to state.  
A defective product must be shipped prepaid to the Authorized Rockford Fosgate  
Dealer from which the consumer purchased the product or to the address below,  
in the original factory carton or equivalent. Any shipping loss or damage will be  
borne by the consumer or the consumers shipper. A consumer returning a  
product to the factory should call (800) 669-9899 for a Return Authorization  
Number. All shipments shall be clearly marked with the Return Authorization  
Number on the outside of the shipping carton.  
Rockford Corporation  
609 Myrtle N.W.  
Grand Rapids, MI 49504 (Receiving-speakers)  
 
NO TES  
 
NO TES  
 
Rockford Fosgate  
Rockford Corporation  
546 South Rockford Drive  
Tempe, Arizona 85281 U.S.A.  
In U.S.A., (602) 967-3565  
In Canada, call Korbon (905) 567-1920  
In Europe, Fax (49) 4207-801250  
In Japan, Fax (81) 559-79-1265  
CP-8975  
7/94  
 

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