Rockford Fosgate Car Speaker ND4 XFM User Guide

AUDIOphile  
1" NEODYMIUM TWEETER  
WITH HIGH PASS CROSSOVER  
ND4-XFM & ND8-XFM  
Owner's Manual  
®
®
 
TABLE OF CONTENTS  
Specifications ................................................................................... 1  
ND4-XFM / ND8-XFM Neodymium Tweeter Contents..................... 1  
Introduction ...................................................................................... 2  
Design and Features........................................................................ 2  
TX-184N/188N High Pass Crossover ........................................ 2  
ND4 and ND8 Neodymium Tweeters ........................................ 3  
Flush Mounting the ND4/ ND8 Tweeters ......................................... 4  
Surface Mounting the ND4/ ND8 Tweeters ...................................... 5  
Wiring the ND4/ND8 Neodymium Tweeter ...................................... 6  
Replacing the ND4/ND8 Dome ........................................................ 7  
ND4/ND8 Neodymium Assembly Diagram ...................................... 9  
Warranty Information...................................................................... 10  
 
SPECIFICATIONS  
ND4  
Power Rating  
50 Watts  
Impedance with crossover  
Sensitivity with input of 1 Watt  
measured at 1 meter  
Resonance Frequency  
Frequency Response  
4  
91dB  
1,500Hz  
3,000 - 20,000Hz  
ND8  
Power Rating  
50 Watts  
Impedance with crossover  
Sensitivity with input of 1 Watt  
measured at 1 meter  
Resonance Frequency  
Frequency Response  
8Ω  
91dB  
1,500Hz  
3,000 - 20,000Hz  
TX-184N/TX-188N  
Crossover Network  
Crossover Frequency  
Crossover Slope  
Connections  
3rd order Butterworth Alignment  
4,000Hz High Pass  
18dB/octave  
Polarized (.110" & .205") Faston  
Terminals  
ND4-XFM/ND8-XFM  
NEODYMIUM TWEETER CONTENTS  
1 pair ND4/ND8 Neodymium Tweeters  
1 pair Flush Mount Cups  
1 pair of surface mounting plates  
1 pair TX-184N/188N High Pass Crossovers  
Mounting Hardware  
1
 
INTRODUCTION  
This manual provides information on the features and  
installation of the ND4 and ND8 Neodymium Tweeters  
and high pass crossovers. We suggest you save this  
manual for future reference.  
We strongly recommend you have your Authorized  
Rockford Fosgate Dealer install the ND4/ND8 Neody-  
mium tweeters. If you do choose to install the tweeters  
yourself, please be sure to read the entire manual  
before beginning.  
DESIGN AND FEATURES  
This section describes the design and features of each  
component in the ND4-XFM/ND8-XFM system.  
TX-184N /  
188N High  
Pass  
The TX-184N/TX-188N High Pass Crossover is de-  
signed to enhance the performance capabilities of the  
ND4 and ND8 Neodymium Tweeters. This compact  
crossover is designed to conform to the following crite-  
ria:  
Crossover  
High pass crossover network centered at 4kHz.  
Straight forward 3rd order (18dB/octave) filter with a  
Butterworth transfer function  
Small size, accomplished by inductors wound on a  
high temperature nylon bobbin with an air core.  
Input and  
Output  
Connectors  
Mounting the TX-184N and TX-188N is accomplished  
with the use of .110" & .205" Faston connectors. These  
connectorsaregold-platedtoeliminatethepossibilityof  
corrosion that can cause signal deterioration.  
Mounting the  
TX-184N /  
188N  
The TX-184N/188N is mounted to relatively flat sur-  
faces with sheetmetal screws inserted into the mount-  
2
 
ND4 AND ND8 NEODYMIUM TWEETERS  
ing holes on either side of the enclosure.  
The ND4 and ND8 Neodymium Tweeters are designed  
for optimum smooth frequency response. This goal, as  
with all other Rockford Fosgate products, is achieved by  
utilizing "high quality, high-end" components.  
Neodymium  
The high ionic compound of neodymium enables a  
smaller tweeter magnet assembly to be used as op-  
posed to the much larger ferrite magnets that are com-  
monly used in speaker manufacturing.  
Magnets  
Ferrofluid™  
Cooling  
The tight tolerances of the neodymium tweeter call for  
ferrofluid as the ideal cooling agent, thereby giving the  
tweeters an increased efficiency and power handling.  
Flush Mount/  
Surface  
The design of the ND4 and ND8 Neodymium Tweeter  
enables you to incorporate the tweeters in either a flush  
mount or surface mount installation.  
Mount  
Replaceable  
Dome  
The voice coil in the neodymium tweeter is replaceable  
if it should ever fail. Instructions for replacing the dome  
are found on page 7.  
3
 
FLUSH MOUNTING THE ND4 /ND8 TWEETERS  
The following instructions explain how to mount the  
ND4/ND8 Tweeters in a flush mount application.  
1. Cut a 2-1/8" (54mm) diameter mounting hole.  
2. With the keyway pointing up, insert the flush mount  
cupintotheholeasshowninthefollowingdiagram.  
Bend back the retaining tabs to secure in place.  
With the wires inserted through the key hole, insert  
the tweeter into the bracket and turn clockwise to  
Front View  
Back View  
Hook up  
wires  
Key turned  
and locked  
Key hole pointing up  
Bend out tabs to hold  
mounting cup in place  
Mounting Hole  
Flush Mount  
Cup  
Speaker Wires  
Tweeter  
Bend out  
holding tabs  
Exploded View  
4
 
SURFACE MOUNTING THE ND4 /ND8 TWEET-  
ERS  
The following instructions explain how to surface  
mount the ND4/ND8 Tweeters.  
1. Place the mounting plate on the surface that the  
tweeter will be mounted to. Mark two (2) oppos-  
ing mounting holes and the center wire access  
hole.  
2. Drill a 1/4 inch (6.4mm) hole for the wire access.  
Drill two (2) 1/8 inch (3mm) holes for the mount-  
ing screws.  
3. Route the hook up wire through the center hole.  
4. Place the mounting plate in position by threading  
thehook-upwiresthroughthecenterhole.Mount  
the mounting plate down using the provided  
screws.  
5. Attach the hook-up wire to the tweeter. Note: Be  
sure to observe proper speaker polarity.  
6. Snap the tweeter onto the mounting plate.  
Tweeter  
Mounting Holes  
Center Wire  
Access Hole  
Mounting  
Plate  
Hook-up Wire  
Mounting Holes  
5
 
WIRING THE ND4/ND8 NEODYMIUM  
TWEETER  
TX-184N/188N  
Input  
Output  
+
+
> –  
+
>
Input  
from  
Amplifier  
To ND4/ND8  
lock in place.  
Note: The color coded wire is connected to the positive (+) terminal on  
6
 
REPLACING THE ND4/ND8 DOME  
Disassembly both the ND4 and ND8.  
1. Gently remove tweeter assembly from mounted  
location.  
2. Disconnect the tweeter wire harness, at the .110  
Fastons end, from the filter network wire har-  
ness.  
3. Remove the "strain relief clip" from the back of  
the tweeter assembly.  
4. Carefully grasp one of the wires leading into the  
Magnet Enclosure and gently pull it straight out.  
Repeat for the other wire.  
5. Carefully remove the replacement Coil/Dome  
Assembly from the Transport/Tool.  
6. Insert the spanner wrench detail of the Trans-  
port/Tool into two of the holes located on the  
bottom of the Magnet Enclosure. While holding  
the tweeter assembly firmly in one hand, un-  
screw the Magnet Enclosure until the Enclosure  
shell can be lifted off cleanly.  
7. Place the Magnet Enclosure on a flat, hard  
surface. Gently insert the tip of a sharp, pointed  
object under the edge of the Adhesive Ring and  
liftup. TheentireCoil/DomeAssemblyshouldlift  
out cleanly. If it does not, re-insert a sharp,  
pointedobjectundertheattachedGasketandlift  
up.  
8. Clean off any excess adhesive from the Magnet  
Enclosure.  
Reassembly  
1. Grasp the replacement Coil/Dome Assembly  
with your thumb and forefinger, and extend the  
protruding voice coil wires such that they extend  
straight down from the Coil/Dome Assembly.  
2. Hold the Magnet Enclosure with your free hand,  
and line up the polarity dot on the Gasket with  
oneoftheholesmarkedwitha"+"ontheMagnet  
Enclosure. Slowly insert the wire into the hole on  
the Magnet Enclosure. Once the wire enters the  
hole, insert the other wire into the opposite hole  
marked with a "", and bring the two pieces  
together, being very careful not to touch the  
7
 
dome.  
3. Once the replacement Coil/Dome Assembly and  
Magnet Enclosure are together, gently pull the  
voice coil wires extending out from the bottom of  
the Magnet Enclosure until any extra slack has  
been eliminated. Wrap the voice coil wires around  
the edge of the Magnet Enclosure away from the  
metalparts.MakesurethattheCoil/DomeAssem-  
bly is seated firmly in place by pressing lightly on  
the Gasket along its perimeter.  
4. Affix the replacement Adhesive Ring around the  
Gasket, extending it onto the plastic edge of the  
Magnet Enclosure. Press lightly on the Adhesive  
Ring along its perimeter to ensure that it is sealed  
in place.  
5. Place the Enclosure Shell over the Magnet Enclo-  
sure and screw it on as far as possible. When it  
becomes difficult to continue, insert the Transport/  
Tool into the two holes in the Magnet Enclosure  
thatdonotcontainwires,andscrewthetwopieces  
together tightly.  
6. Whileholdingthevoicecoilwiresagainstthesides  
of the Enclosure shell, insert the positive (coded)  
leadofthereplacementWireHarnessintothehole  
usedas"+"instep2above.Carefullypushthewire  
up into the hole as far as it will go. Insert the other  
wire into the hole used as "" in step 2.  
7. Once the replacement Wire Harness is in place,  
trim off the excess voice coil wire that extends out  
oftheMagnetEnclosure.Trimthewireasfardown  
as possible to prevent it from touching any metal  
parts or the metal Mounting Cup.  
8. Replace the strain relief clip onto the back of the  
tweeter to hold the wires in place.  
9. Test completed tweeter assembly to verify conti-  
nuity and correct operation.  
10. Re-connect and re-mount the tweeter assembly.  
8
 
ND4/ND8 NEODYMIUM ASSEMBLY DIAGRAM  
9
 
WARRANTY  
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  
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 under warranty will be repaired or  
replaced and billed. For speaker boxes, please return the speaker only.  
Speakers must be returned prepaid to Grand Rapids, MI.  
GENERAL  
Electronicsandspeakerwarrantiesdonotcoveranyappearanceitem, anycost  
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. RockfordFosgatelimitsitsobligationsunderanyimpliedwarranties  
under state laws to a period not to exceed the written warranty period. Some  
statesdonotallowlimitationonhowlonganimpliedwarrantylasts, sotheabove  
limitationmaynotapply.ThiswarrantyappliesonlytoproductssoldintheUnited  
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 consumer specific legal rights, and the consumer may have other rights  
which 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 consumer's 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.  
Prices are subject to change without notice.  
1-800-669-9899  
Rockford Fosgate  
Carbonneau Division  
609 Myrtle N.W.  
Grand Rapids, MI 49504 (Receiving-speakers)  
 
Rockford Fosgate  
A Division of Rockford Corporation  
546 South Rockford Drive  
Tempe, Arizona 85281 U.S.A.  
In U.S.A. (602) 967-3565  
In Canada, call Korbon (416) 567-1920  
In Europe, Fax (49) 4207-801250  
CP-8675 (6/93)  
 

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