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
