Rockford Fosgate RFP-1408/1808 Operating instructions

® ®
car audio
fanatics
for
punch
®
RFP-1408/1808
RFP-1410/1810
RFP-1412/1812
RFP-1415/1815
RFP-1418/1815

Dear Customer,
Congratulationsonyourpurchaseoftheworld'sfinestbrandofcaraudiospeakers. At
Rockford Fosgate we are fanatics about musical reproduction at its best, and we are
pleasedyouchoseourproduct.Throughyearsofengineeringexpertise,handcraftsman-
ship and critical testing procedures, we have created a wide range of products that
reproduce music with all the clarity and richness you deserve.
For maximum performance we recommend you have your new Rockford Fosgate
product installed by an Authorized Rockford Fosgate Dealer, as we provide specialized
training through Rockford Technical Training Institute (RTTI). Please read your
warranty and retain your receipt and original carton for possible future use.
Greatproductandcompetentinstallationsare onlyapieceofthepuzzle whenitcomes
to your system. Make sure that your installer is using 100% authentic installation
accessories from Connecting Punch in your installation. Connecting Punch has
everything from RCA cables and speaker wire to Power line and battery connectors.
Insist on it! After all, your new system deserves nothing but the best.
To add the finishing touch to your new Rockford Fosgate image order your Rockford
wearables,which include everything from T-shirtsand jackets to hats andsunglasses.
TogetafreebrochureonRockfordFosgateproductsandRockfordwearables,intheU.S.
call 602-967-3565 or FAX [phone]. For all other countries, call +001-602-
967-3565 or FAX [phone].
The serial number can be found on the outside of the box. Please record it in
the space provided below as your permanent record. This will serve as
verificationofyourfactorywarrantyandmaybecomeusefulinrecoveringyour
speaker if it is ever stolen.
Serial Number: ________________________________
Model Number:________________________________
If, after reading your manual, you still have questions regarding this product,
we recommend that you see your Rockford Fosgate dealer. If you need further
assistance, you can call us direct at 1-800-795-2385. Be sure to have your serial
number, model number and date of purchase available when you call.
PRACTICE SAFE SOUND™
CONTINUOUS EXPOSURE TO SOUND PRESSURE LEVELS OVER
100dBMAY CAUSE PERMANENT HEARING LOSS. HIGH
POWERED AUTOSOUND SYSTEMS MAY PRODUCE SOUND
PRESSURE LEVELS WELL OVER 130dB. USE COMMON SENSE
AND PRACTICE SAFE SOUND.

TABLE OF CONTENTS
Introduction .............................................................................................1
RF Punch Woofer Contents ......................................................................1
Technical Design Features ....................................................................... 1
Stamped Basket .................................................................................. 1
PVA Cone .......................................................................................... 1
Inverted Dust Cap ..............................................................................1
Aluminum Voice Coil Former............................................................. 2
Four-Layer Voice Coil ........................................................................ 2
Dual Laminated Foam Surrounds ....................................................... 2
Hyper-Extended Pole Piece ................................................................2
Vented Bumped Back Plate ................................................................2
Installation ...............................................................................................3
Recommended Enclosures.................................................................. 3
Building An Enclosure ........................................................................4
Calculating Volume............................................................................4
Subwoofer Crossovers ........................................................................ 4
Wiring Configurations ........................................................................ 5
Specifications........................................................................................... 6
Warranty Information............................................................................... 7
International Information..........................................................................8
Welcome to Rockford Fosgate! This manual is designed to provide
information for the owner, salesperson and installer. For those of you
who want quick information on how to install this product, please turn
tothe InstallationSection ofthismanualorrefertotheiconlistedbelow.
Other information can be located by using the Table of Contents. We,
at Rockford Fosgate, have worked very hard to make sure all the
information in this manual is current. But, as we are constantly finding
newways toimprove ourproduct, thisinformation is subjectto change
without notice.
GETTING STARTED
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Sections marked
INSTALLATION
include “slam dunk”
assembly and wiring
directions

–1 –
INTRODUCTION
The RF Punch Woofers are a full line of low frequency drivers sized
from 8" to 18" and are available in 4 or 8 ohm impedance. The RF
Punch woofers were designed for use primarily in small, sealed
enclosures. By utilizing the latest materials and construction tech-
niques, we are able to offer a speaker with high output at low
frequencies while requiring a minimum of operating space.
RF PUNCH WOOFER CONTENTS
RF Punch Woofer
Installation & Owner's Manual
TECHNICAL DESIGN FEATURES
◆Stamped Basket
TheRFPunchWoofersuseastampedColdRolledSteelbasketwhich
is rigid and lightweight. The basket is finished in a corrosive resistant
powder coated applied process used in many automotive applica-
tions.
THE RESULT: A lightweight and rigid woofer
◆PVA Cone
The cone material used is spruce pulp paper. This provides the
necessary combination of weight and strength and allows high levels
of output without cone break up. The cone is treated with a water
resistantPolyVinyl Acetate(PVA) Emulsionwhich increasesthe cone
rigidity and lowers distortion.
THE RESULT: Increases cone rigidity and lowers distortion
◆Inverted Dust Cap
Theuseoftheinverteddustcapservestoincreasetheconerigidityand
improve the power handling by forcing more air through the voice
coil.
THE RESULT: Increases cone rigidity, smooths frequency response
andpreventsyourfriendsfromfeelingobligatedtoinvertthemforyou.

–2 –
◆Aluminum Voice Coil Former
Thevoicecoilformerisblack,anodizedaluminumforhighlyefficient
thermal transfer. This allows winding high temperature copper wire
in multiple layers for improved efficiency.
THERESULT:Improvespowerhandlingbyefficientlydissipatingheat
◆Four-Layer Voice Coil
Multiple layers of high temperature copper wire are wound on the
AluminumVoiceCoilforefficientthermaltransfer.Themassivevoice
coilincreasesXMAXandaddstothemovingmassofthespeaker.This
lowers the Fs of the speaker for better low frequency response and
increases the power handling.
THE RESULT: Increases XMAX and power handling
◆Dual Laminated Foam Surrounds
TheRFPunchWoofersemployaduallaminatefoamsurroundforthe
frontofthewoofer'ssuspension.Duallaminationimprovesreliability
by making the woofer mechanically stronger.
THE RESULT: Adds mechanical strength
◆Hyper-Extended Pole Piece
The pole piece has been extended to provide a more linear magnetic
field for the operation of the woofer. This lowers distortion and
provides the woofer with better low frequency response.
THE RESULT: Lowers distortion and provides better low frequency
response
◆Vented Bumped Back Plate
The back plate has been stepped deeper to allow the woofer more
excursionwithoutbottomingout.Thisenablesthespeakertobeused
in a smaller enclosure. Additionally, the back plate is vented with a
radiused aerodynamic back vent which efficiently and quietly circu-
lates cool air around the voice coil.
THE RESULT: More excursion and increased power handling

– 3 –
INSTALLATION
Recommended Enclosures Punch 8"
Recommended Sealed .30ft3(8.50L)
D = 8"
(20.32cm)
H = 11"
(27.94cm)
W = 11"
(27.94cm)
Punch 10"
Recommended Sealed .75ft3(21.24L)
D = 10"
(25.40cm)
H = 14"
(35.56cm)
W = 15"
(38.10cm)
Punch 12"
Recommended Sealed 1.25ft3(35.40L)
D = 12"
(30.48cm)
H = 14"
(35.56cm)
W = 19-3/4"
(50.17cm)
Punch 15"
Recommended Sealed 2.5ft3(70.79L)
D = 12"
(30.48cm)
H = 20"
(50.80cm)
W = 25"
(63.50cm)
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Building an Enclosure
Toworkproperly,thewallsoftheenclosuremustberigidandnotflex
when subjected to the high pressures generated by the speaker's
operation. For optimum performance, we recommend using 3/4"
MDF (Medium Density Fiberboard) and internal bracing. The enclo-
sureshould begluedtogether andsecured withnails orscrews. MDF
is porous; therefore, it is suggested to also seal the outside walls with
polyurethane.
Calculating Volume
Calculating volume is merely a matter of measuring the dimensions
in inches and using the formula:
1728"
Height x Width x Depth
Box Volume =
(cubic feet)
Iftwofacingsidesareofunevenlength,addthemtogetheranddivide
by two to take 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
reduces the internal volume so this must be subtracted from the
outside dimensions 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.
Subwoofer Crossovers
There are two operational types of crossovers, passive and active.
Passivecrossovers(coilsorinductors)areplacedonthespeakerleads
between the amplifier and speaker. An active crossover is an elec-
tronic filter which separates the audio signal fed to different amplifi-
ers. For optimum subwoofer performance, we recommend using an
active 80-100Hz low-pass crossover at 12dB/octave.
Punch 18"
Recommended Sealed 4.0ft3(113.27L)
D = 14"
(35.56cm)
H = 20-1/2"
(52.0cm)
W = 32-1/2"
(82.55cm)

– 5 –
Wiring Configurations
Three configurations for connecting speakers to an amplifier
are Series, Parallel, and Series-Parallel wiring. A Series con-
figuration consists of two or more speakers wired in an string
(end to end). A Parallel configuration consists of two or more
speakers wired with the common terminals connected across
eachother.ASeries-Parallelconfigurationisacombinationof
both methods. Determine which method will be compatible
with your amplifier.
RT= R1+ R2+ R3+ etc. 1 1 1 1 1
=++++etc.
RTR1R2R3R4
Series Wiring Parallel Wiring
4Ωload 4Ωload
+ – + –
+ –
8Ωload
8Ωload 8Ωload
+– +–
+ –
4Ωload
•RTindicates the total speaker load
•R1, R2, etc. indicates each speaker in the system
•Red dot indicates “+” terminal of 8 ohm speaker
•Purple dot indicates “+” terminal of 4 ohm speaker
+–
4Ωload 4Ωload
+–
4Ωload 4Ωload
+–
+ –
4Ωload
+– +–
Series-Parallel Wiring
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SPECIFICATIONS
Model RFP-1408 RFP-1808 RFP-1410 RFP-1810 RFP-1412 RFP-1812 RFP-1415 RFP-1815 RFP-1418 RFP-1818
Nom. Imped. 4 8 4 8 4 8 4 8 4 8
FS (Hz) 30 32 24 26 23 25 21 23 19 20
RE (Ohm) 3.6 7.2 3.6 7.2 3.6 7.2 3.6 7.2 3.2 6.4
LE (mH) 2.5 4 2.5 4 2.5 4 2.2 3.5 3.1 4.0
QMS 4.89 5 4.08 4.7 5 5.4 6.24 5.85 5.30 5.73
QES 0.32 0.33 0.27 0.29 0.42 0.47 0.38 0.44 0.43 0.54
QTS 0.3 0.31 0.25 0.27 0.38 0.43 0.36 0.41 0.39 0.50
VAS (cu.ft) 0.883 0.883 3.437 3.437 6.28 6.28 14.34 14.34 18.5 18.5
VAS (liter) 25 25 87 87 178 178 406 406 525 525
Power (Watts RMS) 200 200 200 200 200 200 200 200 250 250
Power (Watts Peak) 400 400 400 400 400 400 400 400 500 500
SPL (dB @ 1w/1m) 85 86 87 88 90 90 93 92 91 91
X-MAX (inches) 0.31 0.31 0.31 0.31 0.31 0.31 0.31 0.31 0.33 0.33
X-MAX (mm) 8 8 8 8 8 8 8 8 8.3 8.3
Rec. Box Vol. (cu. ft.) 0.3 0.3 0.75 0.75 1.25 1.25 2.5 2.5 4 4
Speaker Dis. (cu. ft.) 0.05 0.05 0.06 0.06 0.09 0.09 0.113 0.113 0.19 0.19
Mntg. Dia. (in.) 7
1
⁄
16
7
1
⁄
16
9
5
⁄
32
9
5
⁄
32
11 11 14 14 16
17
⁄
32
16
17
⁄
32
Mntg. Depth (in.) 3
13
⁄
16
3
13
⁄
16
4
1
⁄
2
4
1
⁄
2
5
3
⁄
8
5
3
⁄
8
6
27
⁄
32
6
27
⁄
32
88
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LIMITED WARRANTY INFORMATION
Rockford Corporation offers a limited warranty on Rockford Fosgate products on the
following terms:
•Length of Warranty
1 year on speakers 30 days on speaker B-stock (receipt required)
3 years on electronics 90daysonelectronicB-stock(receiptrequired)
2 years on source units
•What is Covered
This warranty applies only to Rockford Fosgate products sold to consumers by
Authorized Rockford Fosgate Dealers in the United States of America or its
possessions. Product purchased by consumers from an Authorized Rockford
Fosgate Dealer in another country are covered only by that country’s Distributor
and not by Rockford Corporation.
•Who is Covered
This warranty covers only the original purchaser of Rockford product purchased
from an Authorized Rockford Fosgate Dealer in the United States. In order to
receive service, the purchaser must provide Rockford with a copy of the receipt
statingthecustomername,dealername,productpurchasedanddateofpurchase.
•Products found to be defective during the warranty period will be repaired or
replaced (with a product deemed to be equivalent) at Rockford's discretion.
•What is Not Covered
1. Damage caused by accident, abuse, improper operations, water, theft
2. Any cost or expense related to the removal or reinstallation of product
3. Service performed by anyone other than Rockford or an Authorized Rockford
Fosgate Service Center
4. Any product which has had the serial number defaced, altered, or removed
5. Subsequent damage to other components
6. Any product purchased outside the U.S.
7. Any product not purchased from an Authorized Rockford Fosgate Dealer
•Limit on Implied Warranties
Anyimpliedwarrantiesincludingwarrantiesoffitnessforuseandmerchantability
are limited in duration to the period of the express warranty set forth above. Some
states do not allow limitations on the length of an implied warranty, so this
limitationmay not apply. No personis authorized to assume forRockford Fosgate
any other liability in connection with the sale of the product.
•How to Obtain Service
Please call 1-800-669-9899 for Rockford Customer Service. You must obtain an
RA#(ReturnAuthorizationnumber)toreturnanyproducttoRockfordFosgate.You
are responsible for shipment of product to Rockford.
Ship to: Speakers
Rockford Acoustic Design
(Receiving-speakers)
609 Myrtle N.W.
Grand Rapids, MI 49504
RA#:_________________
Ship to: Electronics
Rockford Corporation
Warranty Repair Department
2055 E. 5th Street
Tempe, AZ 85281
RA#:_________________
– 7 –

INTERNATIONAL
INFORMATION
– 8 –

LEA DETENIDAMENTE LAS SIGUIENTES INSTRUCCIONES DE
INSTALACÍON DEL PRODUCTO.
Los terminales positivo y negativo de entrada están ubicados uno en
cada extremo de la carcasa. Este montaje separado previene de
posibles cortocircuitos de la señal a altos niveles de volumen. El
terminalpositivoestámarcadocon un punto enlacarcasa.Unpunto
rojoindicaquelaimpedancia del altavozesde8ohmios, y unpunto
violeta que es de 4 ohmios.
INTRODUCCÍON
LoswoofersRFsonunagamacompletadedriversdebajafrecuéncia
que comprenden diámetros de 8" a 15". Los Woofers RF fueron
diseñadospara suutilización encaja cerradao bass-reflexmediana.
Diseñada para ofrecer la máxima calidad, los Woofers RF ofrecen al
entusiastaprincipianteensistemasdecaraudio,laoportunidadpara
disfrutar de un bajo sólido en las bajas frecuéncias. Nuestros
ingenieroshanseleccionadomaterialesytécnicasparalaconstrucción
de nuestros altavoces con el objetivo de ofrecer características y
confianza comparable a otros altavoces vendidos much más caros.
TERMINALES DEENTRADA
– 9 –

Para un buen funcionamiento las paredes del recinto han de ser
rigidasysinflexiónaaltaspresionesdeaire.Recomendamosusarun
espesor de 1.9 cm de conglomerado de alta densidad o fibra de
mediadensidad.Sielrecintoesmuygrandeesnecessarioreforzarlo
internamente. Las juntas deben ser encoladas y aseguradas con
tornillos o grapas. Internamente las juntas deben ser selladas con
silicona para prevenir las fugas de aire. La cola para madera es la
mejor opción. Debido a la porosidad del conglomerado de alta
densidadylafibraesrecomendablesellarexteriormentelacajacon
poliuretano.
CONSTRUCCION DEUNRECINTO
CALCULO DEL VOLUMEN
Para calcular el volumen sólo se han de medir las dimensiones en
centimetros y aplicar la fórmula:
Volumen du
la caja =
Si dos caras opuestas son de diferente tamaño, súmelas y divida el
total por dos para obtener el promedio. Usando esta técnica se
ahorraraelcálculoporsecciones.Elespesordelmaterialconqueestá
construida la caja reduce el volumen interno, de manera quer ha de
restarse de las dimensiones exteriores para determinar el volumen
interior.Lacantidaddeairequeocupacadamodelovieneespecificado
en la hoja de caracteristicas y también debe sustraerse para obtener
el volumen neto interior.
1000
Alto x Ancho x Profundidad
(en litros)
E
SPAÑOL
– 10 –

VEUILLEZ LIRE LES INSTRUCTIONS SUIVANTES POUR L'INSTALLATION
DE CE PRODUIT.
Les bornes positives et négatives sont fixées de part et d'autre du
saladier.Cetteséparationpermetd'empêcherlescourts-circuitsentre
les fils lors des reproductions sonores élevées. La borne positive est
repérée par un petit point de couleur sur le saladier. Un point rouge
est utilisé pour les haut-parleurs de 8Ω, un point violet pour les haut-
parleurs de 4Ω.
INTRODUCTION
Les woofers Punch sont une gamme complète de haut-parleurs de
graves allant de 20 à 46 cm et disponibles en 4Ωou 8Ω. Les woofer
Punch ont été conçus pour être utilisé de préférence en enceintes
closes.
En utilisant les techniques et les matériaux de construction les plus
récents, nous sommes parvenus à construire un haut-parleur
fournissant un rendement élevé dans les graves tout en requérant un
volume opérationnel minimum.
BORNIERS
– 11 –

Pourfonctionnerconvenablementlesparoisducaissondoiventêtre
rigides lorsqu'elles sont soumises aux hautes pressions dues au
fonctionnementduhaut-parleur.Nousvousrecommandonsd'utiliser
des panneaux de bois aggloméré à haute ou moyenne densité de
particules de type “MDF”. Ces panneaux sont disponibles dans la
plupartdesmagasinsdebricolage.Pouruncaissondegrandvolume
ilestrecommandédeplacerdesrenfortsàl'intérieurducaisson.Les
différents côtés devront être collés (colle à bois) et vissés (ou
éventuellement cloués). Il est recommandé de mettre un joint de
silicone dans les arêtes internes du caisson afin d'éviter les fuites
d'air.Dufaitdelaporositédesmatériauxquenousvousconseillons
il est préférable de recouvrir l'extérieur du caisson avec du
polyuréthane.
CONSTRUIRE UNCAISSON
CALCUL DUVOLUME
Oncalculelevolumeenmesurantladimensiondechaquecôtéeten
utilisant la formule suivante:
Volume du
caisson =
(Litres)
Si les due côtés qui se font face n'ont pas la même longueur,
additionnez les et divisez le résultat par deux pour obtenir la
moyenne des deux longueurs. Utilisez le nombre ainsi obtenu dans
laformulepourdéterminerlelitrage.Cetteméthodepermetd'obtenir
le volume du caisson sans devoir faire de calculs compliqués de
section de volume. L'épaisseur du matériau dont est fait le caisson
réduit le volume interne de celui-ci. Lorsqu'on mesure les côtés du
caisson il ne faut donc pas oublier d'oter des mesures l'epaisseur du
matériau. Le haut-parleur lui-même diminue le volume interne du
caisson.Levolumed'airdéplacéparchaquemodèledehaut-parleur
est repris dans les spécifications techniques et doit également être
soustrait du volume total.
1000
Hauteur (cm) x Longueur (cm) x Largeur (cm)
F
RANCAIS
– 12 –

ANSCHLUββ
ββ
βTERMINALS
BITTE LESEN SIE DIESE GEBRAUCHSANLEITUNG ZUERST SORGFÄLTIG
DURCH. DAS KANN SIE VOR FALSCHEM EINSATZ, AUSFALLEN ODER
SOGAR BESCHÄDIGUNG DES PRODUKTES ODER IHRES FAHRZEUGES
SCHÜTZEN.
EINLEITUNG
Die RF-Punch Woofer sind eine komplette Produktlinie von Tief-
Frequenzlautsprechern mit Durchmesser von 20 cm bis zu 46 cm,
erhältlich in der Impendanz 4 - und 8 Ohm (Die RF Punch Woofer
wurden vorwiegend fur den Einsatz in geschlossenen Gehäuse
konstruiert). Durch die Verwendung neuester Materialien und
Produktionstechniken können wir Ihnen heute einen Lautsprecher
vorstellen, der hohe Lautstärken und tiefe Frequenzen selbst in sehr
kleinen Volumen reproduzieren kann.
DieAnschluβterminalswurdenaufjederSeitedesLautsprecherkorbes
positioniert um eventuelle Kurzschlüsse auch bei hoher Leistung
auszuschlieβen (Das Positiv-Terminal ist durch eine Farbmarkierung
gekenzeichnet). Eine rote Farbamrkierung befindet sich immer bei
einem Lautsprecher mit einer Impedanz von 8 Ohm, eine violette
FarbmarkierungzeichnetdieLautsprechermitderImpedanz4Ohm.
– 13 –

D
EUTSCH
Um das Gehäuse so präzise wie möglich zu bauen, sollten die
Gehäusewände sehr steif und luftundurchlässig sein, um dem
entsehenden Luftdruck des Lautsprechers standhalten zu können.
Wir empfehlen 1,9 cm mittelverdichtete Faserplatte (MDF), die in
den meisten Baumärkten angeboten wird. Bei einem gröβeren
Gehäuse sollten Sie Versteifungen durch Holzbalken montieren.
Diese sollten – wie auch das gesamte Gehäuse – mit Holzleim
geklebtundverschraubtodervernageltsein.UmeinehöhereDichte
zu erreichen, empfiehlt es sich, die Kanten und Verschraubungen
mit Silikon abzudichten und das Gehäuse von innen mit einer
Hohlraumversiegelung zu behandeln.
DER GEHÄUSE BAU
VOLUMEN-BERECHNUNG
Zur Volumen-Berechung benötigen sie die genauen Maβe und
Dimensionen in Zentimetern.
Gehäuse-
Volumen =
SolltenzweigegenüberliegendeSeitenungleichlangsein,sokönnen
sie die Maβe zusammen rechnen und durch zwei dividieren um den
Durchschnittzu erhalten.Diesmacht Ihnendie Berechnungleichter
und Sie müssen das Gehäuse nicht in Sektionen berechnen, die Sie
danachwiedermühseligzusammenzählenmüssen.DieMaterialstärke
beeinfluβt natürlich auch das Innen-Volumen, so muss für eine
präzise Berechnung die Materialstärke von Auβen-Volumen
abgezogenwerden.DerLautsprecherverringert ebenfalls das Innen-
Volumen, auch er sollte natürlich heraus gerechnet werden. Jedes
Lautsprecher-Volumen ist unter “Specifications” genau aufgelistet.
1000
Höhe (cm) x Breite (cm) x Tiefe (cm)
(Kubik Liter)
– 14 –

LEGGERE CON ATTENZIONE LE SEGUENTI ISTRUZIONI PRIMA
DELL'INSTALLAZIONE DEL PRODOTTO.
Iconnettori di ingressopositivi enegativi sonomontatisul cestelloin
posizioni speculari. Il montaggio separato impedisce al segnale
musicaledicortocircuitarsiadaltissimilivellidivolume.(Ilterminale
di ingresso é indicato da una marcatura colorata sul cestello.) Un
contrassengno rosso indica che l'impedenza dell'altoparlante é 8
ohm, il contrassegno viola é impiegato per i 4 ohm.
INTRODUZIONE
I woofer Punch RF sono una linea completa di altoparlanti per basse
frequenze con diametri che vanno da 20 a 46 cm e disponibili sia a
4chea8ohm.(IwooferPunchRFsonoprogettatiperilfunzionamento
principaleincassachiusa.).Impiegandolepiúaggiomatetecnologie
e materiali, siamo in grado di offrire altoparlanti che possono
riprodurre un'elevata pressione sonora alle basse frequenze
mantenendo i volumi di impiego assolutamente ridotti.
CONNESSIONI DI INGRESSO
– 15 –

Per ottenere le prestazioni massime, le pareti della cassa devono
essere rigide e non flettere sotto la sollecitaxione della elevata
pressione generata dal woofer. Noi raccomandiamo l'impiego di
MDF con uno spessore minimo di 19 mm, materiale facilmente
reperibile in tutte le falegnamerle. Per casse di dimensioni molto
grandi é indispensabile prevedere dei rinforzi interni. Le giunture
devono essere incollate e fissate con viti o chiodi in abbondanza.
Intermanmente le giunture devono essere siliconate per impedire
trafilati d'aria. Anche la colla da legno funziona bene. Essendo il
MDF un materiale poroso si consiglia di sigillare l'esterno con
materiali poliuretanici.
COSTRUIRE UNA CASSA
CALCOLO DEL VOLUME
Calcolare il volume é essenzialmente solo un poroblema di
misurazione delle dimensioni in centimetri della cassa e di
applicazione della formula:
Volume della
cassa =
(litri) 1000
Alteza x Larghezza x Profonditá
Se due pareti parallele sono di dimensioni diverse (prisma),
semplicemente sommatele e dividete il risulto per due. Impiegando
ilrisultatoottenutopotetecalcolareilvolumesenzadividerelacassa
i sezioni. Lo spessore del legno riduce il volume interno, per cui é
necessario sottrario dalle dimensioni esterne. Anche il volume
dell'altoparlante stesso riduce il volume della cassa e deve essere
sottratto. Il volume che ciascun altoparlante contribuisce a togliere
dalla cassa é indicato nelle tabelle con le specifiche.
I
TALIANO
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11/96
LIT9778
Rockford Fosgate
Rockford Corporation
546 South Rockford Drive
Tempe, Arizona 85281 U.S.A.
In U.S.A., [phone]
In Europe, Fax [phone]
In Japan, Fax [phone]
MADE IN THE USA
This product is designed, developed and assembled in the USA by a dedicated
group of American workers. The majority of the components used in the
construction of this product are produced by American companies. However, due
to the global nature of their manufacturing facilities and the loudspeaker parts
industry in general, some parts may be manufactured in other countries.