Nxg NX-PROSUB125 User manual

Owner’s Manual
Model NX-PROSUB125
10˝ 125 watt
Powered Subwoofer
Model NX-PROSUB300
12˝ 300 watt
Powered Subwoofer

The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert
the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure,
that may be of sufficient magnitude to constitute a risk of electric shock to persons.
Le symbole éclair avec point de flèche à l’intérieur d’un triangle équilatéral est utilisé
pour alerter l’utilisateur de la presence à l’intérieur du coffret de “voltage dangereux”
non isolé d’ampleur suffisante pour constituer un risque d’éléctrocution.
The exclamation point within an equilateral triangle is intended to alert the user
of the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.
Le point d’exclamation à l’intérieur d’un triangle équilatéral est employé pour alerter
les utilisateurs de la présence d’instructions importantes pour le fonctionnement
et l’entretien (service) dans le livret d’instruction accompagnant l’appareil.
1. Read Instructions – Read all the safety and
operation instructions before operating the NX-
PROSUB125/NX-PROSUB300 (subwoofer).
2. Retain Instructions – Keep the safety and
operating instructions for future reference.
3. Heed Warnings – Follow all warnings on the
subwoofer and in these operating instructions.
4. Follow Instructions – Follow all operating and
other instructions.
5. Water and Moisture – Do not use the sub-
woofer near water – for example, near a bathtub,
washbowl, kitchen sink, laundry tub, in a wet
basement or near a swimming pool.
6. Heat – Locate the subwoofer away from heat
heat sources such as radiators, or other devices
that produce heat.
7. Power Sources – Connect the NX-PROSUB-
125/NX-PROSUB300 only to a power supply of
the type described in these operation instructions
or as marked on the subwoofer.
8. Power Cord Protection – Route power supply
cords so that they are not likely to be walked upon
or pinched by items placed upon or against them,
paying particular attention to cords at plugs, con-
venience receptacles, and the point where they
exit the NX-PROSUB125/NX-PROSUB300.
9. Object and Liquid Entry – Do not drop objects
or spill liquids into the inside of the subwoofer.
10. Damage Requiring Service – The NX-PRO-
SUB125/NX-PROSUB300 should be serviced
only by qualified service personnel when:
A. NX-PROSUB125/NX-PROSUB300 power
supply cord or the plug has been damaged; or
B. Objects have fallen, or liquid has spilled in
the NX-PROSUB125/NX-PROSUB300; or
C. NX-PROSUB125/NX-PROSUB300 has been
exposed to rain; or
D. NX-PROSUB125/NX-PROSUB300 does not
appear to operate or exhibits a marked change
in performance; or
E. The NX-PROSUB125/NX-PROSUB300 has
been dropped, or its chassis damaged.
11. Servicing – Do not attempt to service the
subwoofer beyond those means described in this
operating manual. All other servicing should be
referred to the qualified service personnel.
12. To prevent electric shock, do not use the
NX-PROSUB125/NX-PROSUB300 polarized
plug with an extension cord, receptacle or other
outlet unless the blades can be fully inserted to
prevent blade exposure.
Pour préevenir les chocs électriques ne pas
utiliser cette fiche polariseé avec un prolonga-
teur, un prise de courant ou une autre sortie de
courant, sauf si les lames peuvent être insérées
à fond sans laisser aucune pariie à découvert.
13. Grounding or Polarization – Do not defeat the
grounding or polarization of the subwoofer.
14. Internal/External Voltage Selectors – Internal
or external line voltage selector switches, if any,
should only be reset and re-equipped with a
proper plug for alternate voltage by a qualified
service technician.
15. Cleaning – Clean with a dry cloth only.
16. Where the mains plug or an appliance coupler
is used as the dissconnect device, the disconnect
device shall remain readily operable.
This apparatus does not exceed the Class A/
Class B (whichever is applicable) limits for radio
noise emissions from digital apparatus as set
out in radio interference regulations of the
Canadian Department of Communications.
ATTENTION – Le présent appareil numérique
n’émet pas de bruits radioélectriques dépassant las
limites applicables aux appareils numériques de
class A/de class B (selon le cas) prescrites dans le
règlement sur le brouillage radioélectrique édicté
par les ministere des communications du Canada.
WARNING–To reduce the risk of fire or electric
shock, do not expose this component to rain or
moisture.
Congratulations on your purchase of an
NXG NX-PROSUB125/NX-PROSUB300
powered subwoofer. It will give your stereo
system unparalleled low frequency output.
Bass frequencies are critical to realistic
sound reproduction. After you’ve hooked
up your NX-PROSUB125/NX-PROSUB300
subwoofer, you’ll discover just how much
“punch” and depth you’ve been missing.
No matter what kind of music or videos
you listen to... whether you listen to it loud
or soft, you’ll experience sound that’s rich-
er and fuller. Bass guitar and string bass
will have more impact. You’ll be able to
FEEL as well as hear percussion – just the
way you would at a live performance. If you
have an audio/video system, movies will
come alive with thunderous sound effects
that were never possible without the NX-
PROSUB125/NX-PROSUB300.
The NX-PROSUB125/NX-PROSUB300 is a
self-powered subwoofer that frees your
receiver or power amplifier from the power
demands of reproducing very low frequen-
cies. To do this, the NX-PROSUB125/NX-
PROSUB300 incorporates its own built-in
crossover system that automatically
“assigns” lower frequencies to its own
power amplifier, contained within the sub-
woofer enclosure.
The NX-PROSUB125/NX-PROSUB300 has
been meticulously designed and tested to
insure high performance, durability and
longevity.
This manual is designed to take you step-
by-step through the hook-up and operating
process. This procedure is not difficult, but
it IS slightly different than hooking up a
line level component such as a cassette
deck or DVD player. Reading this manual
carefully will insure that you get maximum
performance from your NX-PROSUB125/
NX-PROSUB300.
2
A. UNPACKING . . . . . . . . . . . . .3
B. NX-PROSUB125/NX-PROSUB300
AMPLIFIER PANEL TOUR . . . . .3
C. PLACEMENT . . . . . . . . . . . . .4
D. HOOKUP . . . . . . . . . . . . . . .4
E. INITIAL LISTENING TESTS . . . . .
& ADJUSTMENTS . . . . . . . . . .7
F. SPECIFICATIONS . . . . . . . . . .7
G. TROUBLESHOOTING &
SERVICE . . . . . . . . . . . . . . .8
H. WARRANTY . . . . . . . . . . . . .8
SAFETY INSTRUCTIONS TABLEOF CONTENTS

3
FIG. 1A - NX-PROSUB125 rear panel FIG. 1B - NX-PROSUB300 rear panel
A. UNPACKING
Remove the NX-PROSUB125/NX-PROSUB300 from its packing
carefully and inspect it for any shipping damage. If you discover
damage, contact your NXG dealer or installer immediately.
If possible, save the carton and internal packing. It’s the best
possible protection for your NX-PROSUB125/NX-PROSUB300 if
you need to move it or return it for service.
Keep your sales receipt in a secure place. It helps establish the
duration of your warranty and is good for insurance purposes (just
in case anything happens to your stereo/home theater system).
B. AMPLIFIER PANEL TOUR
As a starting point, set the control around 80 Hz. if you are using
left and right tower speakers, 100 Hz. with bookshelf speakers, and
120 Hz. with small mini-speakers.
4. POWER/AUTO ON SWITCH. This slide switch turns the
NX-PROSUB125/NX-PROSUB300 on and off. When this switch is
in the AUTO ON position, the amplifier will stay turned on as long
as a signal is being fed to the subwoofer amplifier. 15 to 20 min-
utes after you stop playing music or a video, the amplifier goes into
STANDBY mode – see (2). When you again begin to play music or
a video, the amplifier will automatically turn on.
5. PHASE SWITCH. This switch is used to set the subwoofer’s
phase to either normal “0°” or reverse “180°” (out of) phase. Once
you determine the placement of the NX-PROSUB125/NX-PRO-
SUB300, you will need to try both positions of this switch for the best
bass output for your listening position. The physical location of your
subwoofer and main speakers determines the phase setting that will
sound best at your main listening position. If this requires using the
“180°” mode, don’t worry, there is nothing “abnormal” about it.
6. LFE/LOW LEVEL IN. This connection is used ONLY if you have a
Dolby Pro Logic or Dolby Digital receiver/integrated amplifier
which has a subwoofer output.
7. FROM RECEIVER HIGH LEVEL IN. Connects to your receiver’s
speaker terminals. These color-coded connectors are used to hook
the NX-PROSUB125/NX-PROSUB300 to your receiver if it does not
have sub- woofer out or LFE output connections. This is explained
in item 6 above.
8. REMOVABLE FUSE HOLDER. By pushing in and turning counter-
clockwise, you can remove and replace the fuse. Check the rating
on the fuse for proper size of your unit.
Before actual hookup, you should familiarize yourself with the con-
nections on the back of the NX-PROSUB125/NX-PROSUB300, as
shown in Figs. 1A and 1B above.
1. VOLUME CONTROL. Rotating this knob clockwise increases
the output level of the subwoofer. To start out, make sure that the
VOLUME is turned all the way down (fully counterclockwise).
Later, after some initial listening tests, you can adjust the volume
to your own tastes. However, care should be taken not to overdrive
the subwoofer to the point of audible distortion.
2. POWER INDICATOR. When the amplifier is ON, this indicator
will be green. When the amplifier is in the OFF or STANDBY mode,
the indicator is off.
3. CROSSOVER FREQUENCY CONTROL. This control determines
what lower part of the frequency spectrum will be reproduced by
the NX-PROSUB125/NX-PROSUB300. It is a “crossover” control.
Rotating the knob sets the point where all lower frequencies will be
handled by the subwoofer.
123456
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8

Connecting to a wall plug
The NX-PROSUB125/NX-PROSUB300 draws
a moderately high amount of current. We
do not recommend plugging it into a “con-
venience” outlet (switched or unswitched)
that is often found on the back of receivers
and other stereo components.
Instead, connect the subwoofer ONLY to its
own AC outlet. See items 7 and 8 in the
Safety Instructions on page 2 of this manual.
D. HOOKUP
Two basic connection options
1. Amplifier/speaker hookup If you own a
receiver or integrated amplifier that does
NOT have a subwoofer output or LFE out-
put, use Method A -Amplifier Wiring
Hookup as shown in Fig. 3 (page 5). To
determine whether your receiver has a sub-
woofer output, look on the back for an
RCA-type connector labeled subwoofer out
or LFE out. If your receiver or integrated
amplifier doesn’t have a subwoofer or LFE
output, use Method A - Amplifier Wiring
Hookup Steps for Most Receivers (Fig. 3).
2. Line level hookup If you own a receiver
or integrated amplifier with a subwoofer or
LFE output, you would use Method B - Line
Level Hookup as shown in Fig. 4 (page 6).
C. PLACEMENT
Where to position your NX-PROSUB125/NX-PROSUB300
The NX-PROSUB125/NX-PROSUB300 operates at low bass frequencies which are essentially
omni-directional. That means you can place the NX-PROSUB125/NX-PROSUB300 almost
anywhere in a room without compromising the effectiveness of your main stereo speakers.
Four factors need to be considered: 1) distance from your main speakers;
2) distance from a wall outlet;
3) distance from your receiver; and
4) proximity to walls and corners.
1. Distance from your main speakers. The best placement for your subwoofer is on the
same wall as the main speakers, especially if you are matching up with small bookshelf
speakers. With tower speakers, side wall or rear placement is also acceptable.
2. Wall outlet. Since the NXG subwoofer requires AC power, it must be placed where it
will reach a wall outlet. We don’t recommend extending that range with an extension cord.
3. Connections to your receiver, integrated amplifier or preamplifier. If your receiver or
integrated amplifier does not have a subwoofer output or LFE output (see next page),
hookup between the amp and NX-PROSUB125/NX-PROSUB300 will be made with speaker
wire. You can basically place the NX-PROSUB125/NX-PROSUB300 anywhere in a normal-
sized room.
4. Proximity to walls and corners. Physical placement of the subwoofer will have a definite
impact on the frequency response and the perceived amount of NX-PROSUB125/NX-PRO-
SUB300 bass output. Because low frequencies have long wavelengths, they are influenced
by proximity to a boundary such as a wall or floor.
See Fig. 2. When you place the NX-PROSUB125/NX-PROSUB300 well away from a wall,
it will produce bass at a certain level. Move the subwoofer close to the wall, it will produce
more output (about 3dB more). Putting the subwoofer in a corner will increase output
another 3dB (6dB more than when placed away from walls and corners).
All this technical jargon may sound confusing, but it basically means that you have a
number of options, each of which produces a different amount of bass. For example, if
you like a lot of heavy bass, consider putting the NX-PROSUB125/NX-PROSUB300 into a
corner. If you like smoother, less-obvious bass, move the subwoofer out into the room.
The main thing to remember is that there is no “right” or “wrong” place to put the NX-
PROSUB125/NX-PROSUB300. It all depends on how much bass you want.
Another reason to experiment – because low bass waves are very large (up to 40 feet or
more across!), they tend to cancel and reinforce each other, causing places in the room
where there is lots of bass and others where there isn’t very much at all. If you walk
around your listening room while playing music, you’ll probably discover these sorts of
areas where bass is either exaggerated or reduced. Needless to say, if your main listening
area ends up in a “dead” space, you will need to move the NX-PROSUB125/NX-PRO-
SUB300 so that bass is more normal.
Incidentally, moving the NX-PROSUB125/NX-PROSUB300 around won’t affect the stereo
imaging of your main stereo system, so feel free to try various subwoofer positions.
4
FIG. 2 - NX-PROSUB125/NX-PROSUB300 placement
Speaker wire tips
If you are using Method A as shown in Fig.
3, here are some suggestions that will insure
proper operation:
Speaker wire type. The choice of speaker
wire is dependent on the type of amplifier,
the distance you intend to run the wire, and
your budget. In general, you should not use
extremely thin wire. If in doubt as to what
brand or type of wire to use, consult your
audio dealer.
Length of speaker wires. When hooking up
your main/satellite speakers, make the
hookup wires the SAME LENGTH for BOTH
speakers, even if one speaker is much clos-
er to your amplifier than the other. You may
need to loosely coil up part of one chan-
nel’s wire behind the amplifier if one speak-
er is quite close and the other far away
from the amp or receiver. But it’s worth it.
Keeping both wires the same length will
help maintain proper signal balance and
imaging. Likewise, when making connec-
tions between your receiver and the NX-
PROSUB125/NX-PROSUB300’s FROM
RECEIVER terminals, make sure that the
wire lengths are the same.
Away from walls:
Normal bass
Against walls:
More bass
In corner:
Most bass

5
Establishing polarity. It is very important
that left and right connections be made with
the same plus/minus polarity.
• Most speaker wire is polarity coded. This
means that each conductor is labeled either
“+” positive or “–” negative. The (+) posi-
tive conductor may be a different color or
texture than the (–) negative conductor. For
example, it may be copper-colored (instead
of silver-colored), have a white stripe print-
ed on it, have a series of fine ridges
stamped in it or simply be labeled with little
“+” marks.
• NX-PROSUB125/NX-PROSUB300 FROM
RECEIVER terminals are color-coded: Red
for positive (+) and black for negative (–).
• Any connection that uses speaker wire
requires care in maintaining polarity. When
connecting speakers or a subwoofer to
speaker terminals, or during NX-PRO-
SUB125/ NX-PROSUB300 Method A
Hookup, make sure to connect “+” wires to
“+” terminals, and “–” wires to “–” termi-
nals. For example, if your speaker wire has
one copper-colored conductor and one sil-
ver-colored conductor, connect both ends of
the copper-colored wire (+) to red (+) ter-
minals. Likewise, connect the wire you’ve
identified as negative (in this case, the sil-
ver-colored wire), to black (–) terminals.
Preparing speaker wire
1. Separate the two conductors that make
up each wire for a distance of about one
inch. Then strip off 1/2˝ of insulation
from both ends of each con-
ductor using a wire stripper,
diagonal pliers or knife.
2. Twist each set of thin wires into
a tightly bunched spiral. If your
wire is exceptionally thick (12-
gauge zipcord or special speaker
interconnect cable), divide the
strands into three equal bundles and
twist each into a spiral.
FIG. 3 - Hookup for Receivers and Integrated Amplifiers
without a Subwoofer Output
RECEIVER OR INTEGRATED AMPLIFIER
FRONT
SPEAKERS
LEFT RIGHT
COLOR
TOP
SHAFT
STRIPPED
END (1/2˝) WIRE
To connect wire:
1. Unscrew (counter- clockwise) the top
(color portion)
2. Place the stripped metal wire in the hole
in the metal shaft
3. Tighten (clockwise) the top (color portion)
back down on wire (make sure wire
insulation is not under the plastic nut).
FRONT LEFT
SPEAKER
FRONT RIGHT
SPEAKER
NX-PROSUB125 &
NX-PROSUB300
Speaker Wire
Connection Detail
loosen
tighten
(Refer to Fig. 3 above)
1. IMPORTANT:Make sure that ALL stereo system components
including the NX-PROSUB125/NX-PROSUB300 are turned OFF
before proceeding.
2. Following the prior instructions on this page, strip and twist
TWO lengths of speaker wire that will reach between your receiver’s
left and right speakers terminals and the NX-PROSUB125/NX-PRO-
SUB300. Make these two lengths of wire only as long as is neces-
sary to run between the two components.
3. Connect one speaker wire to the RIGHT “+” and “–” speaker
terminals of your receiver or integrated amplifier. Then connect the
other end of this speaker wire to the RIGHT “+” and “–” FROM
RECEIVER terminals on the back of the NX-PROSUB125/NX-PRO-
SUB300. Use the tips on determining speaker wire polarity to make
sure that “+” is connected to “+” and “–” is connected to “–”.
4. Connect the other speaker wire to the LEFT “+” and “–” speaker
terminals of your receiver or integrated amplifier. Then connect the
other end of this speaker wire to the LEFT “+” and “–” FROM
RECEIVER terminals on the back of the NX-PROSUB125/NX-PRO-
SUB300. As in step 3, double check “+” and “–” polarity.
5. Connect your main/satellite speakers to your receiver as shown in
Fig. 3.
6. You are now ready to put your NX-PROSUB125/NX-PROSUB-
300 subwoofer into use. Skip to “E – INITIAL LISTENING TEST.”
Method A:
Amplifier wiring hookup steps for receivers or surround sound receivers with NO sub output jack

6
FIG. 4 - Hookup for Surround Sound Receiver with a Subwoofer Output
(Refer to Fig. 4 below)
Note: This connection method is only for receivers that have a sub-
woofer or LFE output. If your receiver does not have a subwoofer or
LFE connection as shown in Fig. 4, use Method A – Amplifier Wiring
Hookup Steps for Most Receivers on page 5. You will need one line
level RCA to RCA connector cable long enough to reach from your
receiver to your NX-PROSUB125/NX-PROSUB300 location. This
should be available from your NXG dealer or from radio supply stores.
1. IMPORTANT:Make sure that ALL stereo system components
including the NX-PROSUB125/NX-PROSUB300 are turned OFF
before proceeding.
2. Locate the subwoofer or LFE output connector on the rear of your
receiver and connect one end of the RCA line level cord to it.
3. Route the line cord to the subwoofer location (trying to minimize
areas where it may be stepped on) and connect the other end
directly to the LFE/LOW LEVEL INPUT.
4. Connect your main (and surround speakers if applicable) to the
receiver according to the receiver’s owner’s manual.
5. Note: If you are using a Dolby Digital type receiver with built-in
crossover, you must set the crossover frequency in your receiver
(check your receiver’s owner’s manual). Set the subwoofer’s cross-
over to 180 Hz.
6. You are now ready to put your NX-PROSUB125/NX-PROSUB-
300 subwoofer into use. Skip to “E – INITIAL LISTENING TEST.”
Method B: Line level hookup steps for receivers with subwoofer connections
FRONT
SPEAKERS
RIGHT LEFT
REAR
SPEAKERS
RIGHT LEFT
CENTER
SPEAKERS
RIGHT LEFT
SUBWOOFER
OR LFE
OUT
SURROUND SOUND RECEIVER
NOTE:
SEE ITEM 5 ABOVE FOR
PROPER RECEIVER
TYPE SWITCH SETTING

7
It’s now time to introduce the NX-PROSUB-
125/ NX-PROSUB300 amplifier’s potent and
plentiful bass into your listening environment.
1. Double-check all connections.
2. Make sure that the volume controls on
both the NX-PROSUB125/NX-PROSUB300
and your receiver/integrated amp/preamp
are turned all the way down (fully counter-
clockwise). Set the PHASE switch to nor-
mal. Set the CROSSOVER FREQUENCY
knob to 80 Hz for normal operation, or to
180 Hz for Dolby Digital operation where the
proper crossover frequency is set in the
receiver’s crossover.
3. Turn on your stereo/home theater system.
THEN turn on the NX-PROSUB125/NX-
PROSUB300. Confirm that the subwoofer’s
green POWER indicator is glowing. If it
isn’t, check the power connections between
the NX-PROSUB125/NX-PROSUB300 and
the wall socket.
4. Play a musical selection that you are
familiar with. Pick a song that has regular
low bass beats. Advance the receiver/inte-
grated amp/preamp’s volume control up to
a normal listening level. If you don’t hear
sound through your main speakers, turn off
the system and check connections. Also
consult the troubleshooting tips on page 8.
5. If sound is indeed coming out of your
main speakers, turn the NX-PROSUB-
125/NX-PROSUB300’s VOLUME control
clockwise until you hear noticeable addi-
tional bass. If you don’t hear bass by the
time you have advanced the subwoofer’s
VOLUME control halfway, turn off the sys-
tem and check connections. Also consult
the troubleshooting tips on page 8.
6. Adjust the NX-PROSUB125/NX-PRO-
SUB300’s VOLUME control until you are
satisfied with the amount of bass. You may
want to try several different albums, tapes
or compact discs while determining how
high to adjust the NX-PROSUB125/NX-
PROSUB300’s VOLUME. The amount of
bass varies from CD to CD and between dif-
ferent types of music.
7. Now that you have adjusted the quantity
of bass via the volume, it’s time to work on
the quality of the bass with the
CROSSOVER FREQUENCY control, PHASE
switch – and experimentation with NX-PRO-
SUB125/NX-PROSUB300 room position.
• While playing music, move the subwoofer
around, in and out of corners, closer and far-
ther from the wall, etc. as much as the power
cord and other connections will allow.
• Change the PHASE switch back and forth
from NOR to REV while someone sits in
the main listening position. Leave the switch
in the position where you like the bass most.
• Change the CROSSOVER FREQUENCY
control (for Dolby Pro-Logic receivers) to
higher and lower settings. If the CROSS-
OVER FREQUENCY control is set too high,
you’ll start to hear low midrange (voices
and instruments) through it. This will neg-
atively affect the stereo imaging of your
main speakers. Back the CROSSOVER FRE-
QUENCY setting off until you hear only
bass from the NX-PROSUB125/NX-PRO-
SUB300. If the CROSSOVER FREQUENCY
control is set too low, you simply won’t get
much output from the subwoofer. Move it
back closer to 80Hz.
8. After you are satisfied with the output of
your NX-PROSUB125/NX-PROSUB300, you
can make all your volume settings through
your main stereo system’s volume control.
The only time you might want to re-adjust
the NX-PROSUB125/NX-PROSUB300’s VOL-
UME is when you encounter a musical selec-
tion that has abnormally low – or high – bass.
You can leave the NX-PROSUB125/NX-PRO-
SUB300 turned on and in AUTO ON mode
when not in use. It does not draw much power
in this state and will be ready to add low bass
the moment you begin to play music.
Remember, you don’t have to do anything
except leave the POWER switch in the AUTO
ON position. The NX-PROSUB125/NX-PRO-
SUB300 will automatically go into STANDBY
mode after 10 to 20 minutes, when no
music is playing.
If you’re not using your stereo system for a
long period of time (such as when you’re
on vacation), turn the POWER switch to the
OFF position.
Caring for Your
NX-PROSUB125/
NX-PROSUB300
The NX-PROSUB125/NX-PROSUB300
enclosure is finished in a very high-quality
polymer laminate covering that is both
attractive and excellent protection for the
wood cabinet. To remove dust, finger
prints, and light water marks you can use a
soft, dry cloth. Never use a solvent like
paint thinner, keytone, gasoline, MEK,
lighter fluid, etc., on the enclosure surface
or it will cause permanent damage.
E. INITIAL LISTENING TEST
NX-PROSUB125/NX-PROSUB300
Power Output
NX-PROSUB125: 125 watts
NX-PROSUB300: 300 watts
Design
Bass Reflex (Front-Ported), Front-Firing
Woofer
NX-PROSUB125:
10˝ Reinforced Fibrous Pulp Cone
NX-PROSUB300:
12˝ Reinforced Fibrous Pulp Cone
Sensitivity
NX-PROSUB125: 92 dB
NX-PROSUB300: 94 dB
Frequency Response
NX-PROSUB125: 25Hz - 180Hz Variable
NX-PROSUB300: 22Hz - 180Hz Variable
Impedance
8 ohms
Controls
Power, Volume, Auto Shut Off, Phase,
Crossover Frequency
Input Options
Speaker Level & LFE/RCA Line Level
Shielded
No
Dimensions
NX-PROSUB125: 153/4˝ H x 117/8˝ W x 147/8˝ D
(400 mm H x 302 mm W x 378 mm D)
NX-PROSUB300: 161/2˝ H x 15˝ W x 157/8˝ D
(419 mm H x 381 mm W x 403 mm D)
Finish
Black Woodgrain
F. SPECIFICATIONS

8
©2008 NXG Technology
G. TROUBLESHOOTING & SERVICE
Before returning your NX-PROSUB125/NX-PROSUB300 for service,
you can save time (and often embarrassment) by checking for a few
problems that are most often encountered.
Power light is not lit. No sound.
1. Is your NX-PROSUB125/NX-PROSUB300 plugged in to a live AC
wall socket?
2. Is the power switch on?
3. Has the NX-PROSUB125/NX-PROSUB300 overheated and shut
off temporarily?
4. Is the fuse OK?
No sound from either set of speakers.
1. Are your other components turned on?
2. Is the receiver or preamp set to the appropriate input and is
that sound source playing?
3. Do you have an unconnected tape monitor selected?
4. Is the NX-PROSUB125/NX-PROSUB300 correctly connected to
your receiver, preamplifier or integrated amplifier and turned on?
Sound comes from main speakers but not subwoofer
1. Is the NX-PROSUB125/NX-PROSUB300 turned on (power light
in the green mode) and VOLUME control turned up?
2. Check the speaker connections for small strands of wire
touching both terminals.
3. Some digital receivers only send a sub out signal when in the
movie or digital mode. In the 2 channel (stereo music) mode, no
sub out signal is sent to the sub.
You may need to set your main speakers to “small” mode in your
receiver setup to get the receiver’s subwoofer output to turn on.
Check your receiver’s owner’s manual for subwoofer operation.
4. For digital receivers – make sure the subwoofer is “ON” and
the subwoofer level is set to “0 dB” or greater.
Sound comes from the subwoofer but not your main speakers
1. If you have used either version of Hookup Method A, check
the connections between your receiver and your main or satellite
speakers.
2. If you have used Hookup Method B (Line Level)...
• confirm that the power amplifier is turned on.
• check the RCA patch cord
• check the speaker wire connections between the receiver and
main or satellite speakers.
Bass is muffled or weak
1. Check speaker wire polarity of all connections.
2. Reposition your subwoofer. At some points in the room, its
output may be cancelled by the geometry of the room. Moving
the NX-PROSUB125/NX-PROSUB300 can eliminate this problem.
Please refer to Item 10 in the Safety Instructions for conditions
that ALWAYS require service by qualified personnel.
If you have tried all the above and still cannot get the
NX-PROSUB125/NX-PROSUB300 to operate properly, consult
your dealer or call NXG Tech Support at 1-800-733-0008.
H. WARRANTY INFORMATION
NX-PROSUB125/NX-PROSUB300
Powered Subwoofer Limited Warranty
If the NXG speaker system proves to be defective in workmanship
or materials within seven years (two years for the electronic ampli-
fier) from the date of the original customer’s purchase, we will, at
our option, repair or replace the defective product.
Limitation of Implied Warranties
Any implied warranties, including warranties of merchantability
and fitness for a particular purpose, are limited in duration to the
length of this warranty.
Exclusion of Certain Damages
NXG’s liability for any defective product is limited to repair or
replacement of the product at our option. NXG shall not be liable
for incidental or consequential damages of any kind or character
because of product defects. Some states do not allow limitations
on how long an implied warranty lasts and/or do not allow the
exclusion or limitation of incidental or consequential damages, so
the above limitations and exclusions may not apply.
This Warranty Does Not Cover:
• Damage caused by abuse, accident, misuse, negligence,
or improper operation.
• Any product whose serial number has been altered, defaced,
or removed.
• Products that have been altered or modified.
• Normal wear and maintenance.
• Damages caused by shipping. (All claims for shipping
damage must be made with the carrier.)
Warranty Service
Warranty service must be performed by an authorized service cen-
ter, usually an NXG speaker systems dealer or its authorized agent.
You may obtain a list of authorized service centers by contacting
NXG. All warranty repairs must be accompanied by the original bill
of sales. No other document is acceptable or is required. This war-
ranty gives you specific legal rights, and you may also have other
rights which vary from state to state.
NXG reserves the right to revise speaker system specifications without notice.
16648 North 94th Street • Scottsdale, AZ 85260
1-800-733-0008 www.nxgtechnology.com