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: 15
3
/
4
˝ H x 11
7
/
8
˝ W x 14
7
/
8
˝ D
(400 mm H x 302 mm W x 378 mm D)
NX-PROSUB300: 16
1
/
2
˝ H x 15˝ W x 15
7
/
8
˝ D
(419 mm H x 381 mm W x 403 mm D)
Finish
Black Woodgrain
F. SPECIFICATIONS
