AUDIOphile
1" NEODYMIUM TWEETER
WITH HIGH PASS CROSSOVER
ND4-XFM & ND8-XFM
Owner's Manual
®
®
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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
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SPECIFICATIONS
ND4
Power Rating
50 Watts
Impedance with crossover
Sensitivity with input of 1 Watt
measured at 1 meter
Resonance Frequency
Frequency Response
4Ω
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
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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
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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
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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
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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
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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
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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
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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
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ND4/ND8 NEODYMIUM ASSEMBLY DIAGRAM
9
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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)
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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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