AMPLIFIER OPERATION
Please use Diagrams 1 & 3 to familiarize yourself with the front and rear panels of the Bass Power 250.
CAUTION: Please read all the following instructions to prevent causing damage to your system.
Front Panel Controls
• Volume Control
Use this to match the output level of the subwoofer to that of the main speakers in the system. We recommend that you
play a variety of material before selecting a setting. Start with the control turned completely counterclockwise (off) and
slowly turn it up. NOTE: Turning the volume up slowly will prevent possible damage to the woofer from the system being
run too “hot”. Very little movement of the knob is needed.
CAUTION: If a popping sound (clipping) is audible through the subwoofer, it is being over driven, reduce the
volume of the amplifier, or speaker damage may occur! (See Volume Limit Control for proper adjustment of
volume settings to avoid distortion & damage.)
• Auto Sense Power On
The Amplifier is turned on and off by sensing audio signals coming from the receiver or preamp through the input
connections. The Active LED on the front of the amplifier will be lit red until an audio signal is sensed. At the moment that
an audio signal is sensed on either the Left or Right, line level or speaker level inputs, or the LFE input, the amplifier will
then turn on and the Active LED will turn green. Once the audio signal stops, the amplifier will wait five minutes before
turning off. NOTE: The amplifier’s rear power switch must be turned on for the Audio Sense mode to operate. Once the
power is switched on, the auto sense circuitry becomes operational. If you will be away for a long period of time, you
may turn off the rear power switch or unplug the unit from the outlet if you wish.
• Protection Circuitry
If the Protection circuit in the amplifier is activated, the amplifier will turn off and the Active LED will turn red. This
indicates one of the following situations has occurred:
a. The Protection Circuit detected the amplifier was in danger of overheating and has temporarily shut down to
protect the system. The Active LED will turn green again and the amplifier will return to “Active” without any
intervention necessary.
b. A fault in the wiring, the speaker, or the amplifier may cause the amplifier to remain off. In this case, turn the
rear power switch off and then on. If the amplifier returns to the protection mode, turn the amplifier off and refer
to the troubleshooting section of this manual.
Rear Panel Controls
The following controls allow you to blend the sound wave output of the Bass Power to the output of the main speakers in
your system.
•
Power Switch
The switch marked “Power” on the rear panel of the amplifier will turn off all amplifier circuitry including Auto Sense
circuitry (See Diagram 1 for reference).
• Low Frequency (Low Pass) Crossover
Use this control to adjust the upper frequency limit of the Bass Power. The purpose is to control the overlap of the
Bass Power’s upper frequencies and the main speaker’s lower frequencies. If adjusted well, this allows seamless
blending of the subwoofer with the speakers.
DIAGRAM 3
Bass Power Front Panel
Active LED
Volume Control
5
