Rockford Fosgate Speaker RFA 408 User Guide

AUDIOPHILE WOOFERS  
RFA-408  
RFA-410  
RFA-412  
RFA-808  
RFA-810  
RFA-812  
O W N ER' S MAN U AL  
 
TABL E O F C O N T E N T S  
Punch Audiophile Woofer Contents .................................................. 1  
Introduction ...................................................................................... 1  
Design Features................................................................................. 1  
Cone ........................................................................................... 1  
Vented Pole Piece ....................................................................... 1  
Suspension .................................................................................. 1  
Voice Coil ................................................................................... 2  
Powder Coated Basket................................................................. 2  
Epoxy Filled Inverted Dust Caps .................................................. 2  
Dual Input Terminals................................................................... 2  
Low Frequency Speaker Systems ....................................................... 2  
Using the Punch Audiophile Woofers ............................................... 3  
Calculating Load Impedance ............................................................. 3  
Calculating Volume .......................................................................... 4  
Building An Enclosure ....................................................................... 4  
Specifications .................................................................................... 6  
Warranty Information ........................................................................ 7  
 
PUNCH AUDIO PHILE WO O FER CO NTENTS  
Punch Audiophile Woofer  
Punch Audiophile Woofer manual  
IN TRO D U CTIO N  
This manual provides information on the construction, installation  
and operation ofthe Punch Audiophile Woofers. We suggestyou save  
this manual for future reference.  
The Punch Audiophile woofers are a full line of low frequency drivers  
in 8", 10", and 12" sizes; in 4 or 8 ohm impedance. They are designed  
for use primarily in small, sealed enclosures. By utilizing the latest  
materials and construction techniques, we are able to offer a speaker  
with good, low frequency response while requiring a minimum of  
operating space.  
DESIG N FEATU RES  
Cone – The cone material used is spruce pulp paper reinforced with  
Kevlar® fiber (8" and 10" only). This provides the necessary combi-  
nation ofweightand strength and allowshigh levelsofoutputwithout  
cone break up. The cone is treated with a water resistant Polyvinyl  
Acetate Emulsion (PVA) which increases the cone rigidity and lowers  
distortion.  
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 from the voice coil assembly.  
Suspension – The suspension holds the cone to the basket and  
supports the voice coil in the magnetic gap. The suspension should  
allow the cone to move in and out freely but not allow side to side  
motion. The Punch Audiophile woofers all use a Nitrile rubber  
surround for the front and a flat spider design for the rear. This  
combination takes full advantage of the Kevlar® cone's stiffness  
allowing clean, uncolored reproduction.  
Kevlar® is a registered trademark of E.I. DuPont de Nemours & Co., Inc.  
– 1 –  
 
Voice Coil – The construction of the voice coil is designed to  
maximize the speaker's power handling. The wire used is high  
temperature copper, wound in multiple layers on a black, anodized  
aluminum former. The wire will withstand high temperatures while  
the former conducts heat away from the coil.  
Powder Coated Basket – The stamped steel baskets of the Punch  
Audiophile woofers are finished with a powder coat process. This  
good looking finish damps the basket resonance, preventing basket  
vibration from coloring the sound. Unrelated to the sonic perfor-  
mance of the speakers, but equally important, the powder coating  
used is environmentally friendly since no toxic chemicals are re-  
leased into the atmosphere during the process.  
Epoxy Filled Inverted Dust Caps – The inverted dust cap provides a  
flatter power response and rigidity to the cone. Epoxy filling adds  
mass, to ensure the high performance in small, sealed boxes.  
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 an 8  
speaker, a violet dot on a 4speaker.  
LO W FREQ U EN C Y SP EAKER SYSTEM S  
The Punch Audiophile woofers require an enclosure to achieve  
optimum results. The enclosure allows the speaker to operate at lower  
frequencies 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 Punch Audiophile woofers will yield optimum perfor-  
mance in a small, sealed enclosure.  
– 2 –  
 
USING THE PUNCH AUDIOPHILE 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 crossovers, 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 Punch Audiophile 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.  
C A L C U L AT I N G LO A D I M P E D A N C E  
The Punch Audiophile Woofers are used for the sub-bass region,  
those frequencies 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:  
RT = R1 + R2 + R3 + etc.  
In a parallel circuit the impedance is determined by the formula:  
1
1
1
1
1
=
+
+
+
+ etc.  
RT  
R1  
R2  
R3  
R4  
Where RT is the total speaker load and R1, R2, etc. represent each  
speaker in the system.  
The crossover is connected in line to the positive terminal of the  
speaker system. Crossovers are available from Authorized Rockford  
Fosgate Dealers.  
– 3 –  
 
C ALC U LAT I N G VO LU M 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  
take the average. Usingthisnumberwillgive you the volume without  
the necessity of calculating the box in sections and adding the  
sections together. The thickness of the baffle material reduces the  
internal volume so this must be subtracted from the outside dimen-  
sions to determine 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 calculation.  
BU I L D I N G AN EN C L O SU R E  
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 and secured  
with either nails or screws; internally the joints should be sealed with  
silicon to prevent air leaking. Wood glue works best. Because the  
high density particle board and MDF are porous materials, it is  
suggested to seal the outside enclosure walls with polyurethane.  
A
C
– 4 –  
 
Cut out two pieces of each panel using 3/4" MDF.  
Model #  
Panel “A”  
Panel “B”  
Panel “C”  
4.75" x 9"  
Volume  
RFA-408/808  
RFA-410/810  
RFA-412/812  
10.5" x 16.5"  
12.75" x 19.75"  
13.5" x 20.5"  
4.75" x 16.5"  
.33 cu. ft.  
6.25" x 19.75" 6.25" x 11.25" .66 cu. ft.  
7.75 x 20.5" 7.75" x 12" .88 cu. ft.  
In Conclusion  
Special care has been taken to ensure your satisfaction with the  
Punch Audiophile Woofers. The materials and workmanship have  
been carefully selected to guarantee performance equal to the needs  
of the most demanding conditions. If you have any further questions  
oradvanced system needs, yourAuthorized Rockford Fosgate Dealer  
will be happy to assist you.  
– 5 –  
 
– 6 –  
 
W ARRAN T Y IN FO RM AT I O N  
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 must 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)  
 
N O T E S  
 
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-9050  
7/94  
 

Raypak Boiler 42 66 User Guide
Raypak Indoor Furnishings 302B 2342B User Guide
RCA Car Satellite Radio System ANT711 User Guide
Rolls Music Mixer RP262 User Guide
Saab Automobile 2007 9 3 User Guide
Samsung Air Conditioner AWT24P1HEA User Guide
Sanyo DVD Player DC TS762 User Guide
SATO Printer CL408 412e User Guide
SECO LARM USA Security Camera EV 122C DVC3 User Guide
Secure Computing Network Router SafeNet User Guide