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suBwooFer rear-PaneL ConTroLs and ConneCTions
Auto-On switch:
•
On/Auto: When this switch is set in the “On/Auto” position the
subwoofer will automatically turn itself on when it receives an audio
signal, and will enter the Standby mode when it has gone without
receiving an audio signal for 10 minutes.
•
Off: Set the switch in the “Off” position to turn the subwoofer off.
Select this position if you will not be using the subwoofer for an
extended period of time, such as when on vacation.
Phase switch: This switch determines whether the subwoofer driver’s
piston-like action moves in and out in phase with the satellite speakers. If
the subwoofer were to play out of phase with the satellite speakers, the
sound waves from the satellites could partially cancel out the sound waves
from the subwoofer, reducing bass performance and sonic impact. This
phenomenon depends in part on the placement of all the speakers relative
to each other in the room.
Line-Level Input connector: If your receiver/processor has a dedicated
subwoofer output, use a single RCA audio cable (not supplied) to connect
it to the subwoofer’s Line-Level Input connector.
Crossover Frequency control: This control determines the highest
frequency at which the subwoofer reproduces sounds. The higher you set
the Crossover control, the higher in frequency the subwoofer will oper-
ate and the more its bass will “overlap” that of the satellite speakers. This
adjustment helps achieve a smooth transition of bass frequencies between
the subwoofer and the satellites for a variety of different rooms and sub-
woofer locations.
Volume control: Use this control to adjust the subwoofer’s volume. Turn
the knob clockwise to increase the volume; turn the knob counterclock-
wise to decrease the volume.
Speaker-Level Input connectors: If your receiver does not have a
dedicated subwoofer output, use speaker wire (not supplied) to connect
its Front Left and Front Right speaker outputs to the subwoofer’s Speaker-
Level Input connectors. Connect your system’s Front Left and Front Right
speakers to the subwoofer’s Speaker-Level Output connectors (see below).
Speakers and amplifiers have corresponding positive and negative (“+” and
“–”) connectors. The SP150 Speaker-Level Input connectors are marked
“+” and “–” beneath the connector levels. Additionally, the “+” connectors
have red markings, while the “–” connectors have black markings.
To ensure proper polarity, connect each “+” connector on the back of your
receiver or amplifier to the respective “+” (red) connector on each speaker.
Connect the “–” connectors in a similar way. Do not reverse polarities (i.e.,
“+” to “–” or “–” to “+”) when making connections. Doing so will cause
poor stereo imaging and diminished bass performance.
IMPORTANT: Make sure the “+” and “–” wires or connectors do not
touch each other or the other terminal. Touching wires can cause
a short circuit that can damage the subwoofer or your receiver/
amplifier.
Speaker-Level Output connectors: If you used the subwoofer’s Speak-
er-Level Input connectors to connect it to your receiver, you must connect
your system’s Front Left and Front Right speakers to the subwoofer’s
Speaker-Level output connectors. To ensure proper polarity, connect each
“+” connector on the subwoofer to the respective “+” (red) connector on
each speaker. Connect the “–” connectors in a similar way. Do not reverse
polarities (i.e., “+” to “–” or “–” to “+”) when making connections. Doing so
will cause poor stereo imaging and diminished bass performance.
IMPORTANT: Make sure the “+” and “–” wires or connectors do not
touch each other or the other terminal. Touching wires can cause
a short circuit that can damage the subwoofer or your receiver/
amplifier.
AC Fuse holder: The SP150 is factory-equipped with a 2A/250V AC fuse.
If the fuse ever blows:
1. Unplug the subwoofer’s power cord from the wall.
2. Use a screwdriver to remove the blown fuse.
3. Replace the fuse with an identical 2A/250V fuse.
2. Use a screwdriver to remove the blown fuse.
3. Replace the fuse with an identical 2A/250V fuse.
CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE,
REPLACE THE FUSE ONLY WITH THE SAME TYPE AND RATING.
Power cord: After you have made and verified all subwoofer and speaker
connections described in this manual, plug the power cord into an ac-
tive, unswitched electrical outlet for proper operation of the subwoofer.
DO NOT plug this cord into the accessory outlets found on some audio
components.
Crossover Frequency
Control
Auto-On Switch
Phase Switch
AC Fuse
Holder
Speaker-Level
Input Connectors
Line-Level
Input Connector
Speaker-Level
Output Connectors
Volume Control
Power Cord
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150P / 230V Service Manual
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