Outlaw Audio LFM-2 - Manual (Page 7)

7 LFM Series Low Frequency Modules
Owner’s Manual
Subwoofer Placement
. Connect one end of the subwoofer cable to the subwoofer or LFE output
on the receiver or processor.
4. Locate the connection labeled SUB IN on the rear panel of the subwoofer
and connect the other end of the subwoofer cable to that jack.
5. Plug the LFM’s power cord into the input on the LFM Series Subwoofer
and connect the plug to an un-switched AC outlet.
CAUTION: Due to the power requirements of the LFM, it must not
be connected to the accessory outlets on a receiver or processor. If a
power-strip or surge protector is used, make certain that it is rated to
accommodate your LFM’s power requirements.
. Reconnect your processor or receiver to the AC power source.
7. Proceed to the “Setting The LFM’s Controls” section to learn about the
LFM’s controls and how they operate.
Connecting to a System with No Preamp Outputs
If no low-level subwoofer output is available, you will need to run speaker wires from your
main amplifier or receiver to the subwoofer amplifier. See Diagram 2 on page 6.
To connect an LFM Series Subwoofer using high level inputs:
1. Turn off all system components and unplug the receiver and/or amplifier
and the LFM from their AC power source.
. Locate the front left/right speaker output terminals on your receiver or
amplifier.
In cases where there are both “A” and “B” terminals, the “A” terminals should
be used. Disconnect any wire that is presently connected to these terminals.
. Using the same type of speaker wire used for your other speaker
connections, connect the left and right channel speaker outputs of
your receiver or amplifier to the LFM’s High Level Inputs.
Be sure to connect the speaker wires to the appropriate input binding posts
located on the back of the LFM, making certain that the polarity (–/+) on the
receiver or amplifier matches the polarity on the binding posts of the subwoofer
amp. In most cases this means connecting the red terminal on the receiver or
amplifier to the red terminal on the LFM, but always check the markings on the
rear panel to insure “+ to +” and “– to –” connections. Also, make sure that
the negative outputs on your main amp are true ground; otherwise you would
short the output of your main amp. Call or email tech support if the negative
outputs on your main amplifier do not have true ground.
4. Connect the speaker wires to the high-level output terminals on the
back of the LFM Series Subwoofer.
Make certain that the polarity (–/+) on the subwoofer’s high-level output ter-
minals matches the polarity on the binding posts of the speakers. Also, be sure
to prevent any positive and negative strands of speaker wire from crossing.
5. Plug the LFM’s power cord into the input on the LFM Series Subwoofer
and connect the plug to an un-switched AC outlet.
CAUTION: Due to the power requirements of the LFM Series Subwoof-
ers, they must not be connected to the accessory outlets on a receiver
or processor. If a power-strip or surge protector is used, make certain
that it is rated to accommodate the LFM’s power requirements.
. Reconnect your receiver and/or amplifier to the AC power source.
7. Proceed to the “Setting The LFM’s Controls“ section to learn about the
LFM’s controls and how they operate.
Subwoofer Placement
Placement of your LFM series subwoofer is a critical component in maximizing
its performance. The subwoofer’s specific location in a room influences the its
“perceived” frequency response, sound pressure level (SPL), and overall accuracy.
Since each listening room differs in virtually every aspect, the ideal location will
also vary.
An easy way to find the right spot to place your new LFM Series Subwoofer is to
experiment with what we call the “Subwoofer Switch Trick.” This process puts the
subwoofer where you normally sit and then lets you play the role of the subwoofer.
First, place the subwoofer as close to your favorite listening position as possible.
This should be in front of your couch or easy chair, right in the room’s “sweet
spot.” Provided that there is no damage to your furniture, you may even place the
subwoofer on the chair or couch, but remember that LFM Series Subwoofers are
heavy, and the Outlaws are not responsible for any damage to your furniture or
for arguments this might cause with other members of the household!
Second, activate the test tone from your processor or receiver’s internal test
tone generator, or use your favorite test disc so that pink noise plays through
the subwoofer. While the test tone is playing, walk around your room and find
the spots where you hear the best bass response. Sometimes this may be in the
center of the room, while in other cases you may find the best spot in a corner
or along a sidewall.
Finally, turn off the test tone and move the subwoofer to the location where you
hear the best bass response. If that location is unacceptable or impractical, repeat
the procedure to the spot that is the best compromise between bass performance
and aesthetic considerations.
Notes On Subwoofer Placement
Try to avoid creating a listening position that falls directly between the front
and back walls. This may cause a strong interference effect due to the collision
between bass waves bouncing off the rear wall and new waves emanating from
the LFM. When this happens you might hear an unnatural “build up” in the low
frequencies where the bass sounds “bloated”, based on the specific dimensions of
the room and the particular frequency being reproduced.
In other situations you might encounter a “null”, which is caused by two low
frequency waves canceling each other out. When this happens you will find that
your favorite listening position is bass shy. In this type of placement situation,
bass response will suffer greatly regardless of how powerful the subwoofer is. The
best way to solve this problem is to change the location of the seating position
so that the distance to the front of the room is different than that to the back of
the room.