Studio Pro Series SP-200 & SP-350 Built-in Subwoofer Amplifiers
It is recommended that you read the information provided on this sheet before making connections to your Subwoofer Amplifier. This will help you to have an understanding of how to set up and to operate your SP-200 or SP-350 Amplifier for optimum performance.
Back Panel of Subwoofer
1. Power Switch: This switch allows the amplifier to be turned on and off manually, or when kept in the “Auto On” position (see #2) the amp will automatically turn on when it detects an incoming audio signal. Important! Set the Level Control to the minimum setting (counterclockwise) before initially plugging the amplifier into an A. C. outlet and also before initially turning on and/or testing system for correct settings.
2. Auto Switching: This switch, when in the “Auto On” position, allows the amplifier to automatically turn on when there is an audio signal present at either the “Line” inputs or the “Speaker Level” inputs. To auto-switch, the Power Switch must be in the “Auto On” position. The Power indicator light above the Auto Switch will glow Red when the unit is in Standby mode. The Light will glow Green when an input signal is detected.
3. Low Pass Switch: This switch allows the amplifier’s internal low-pass filter to be defeated when using a subwoofer with a passive crossover, or when the crossover is not needed or desired for any reason. When defeated (“off ”), the subwoofer output of the subwoofer amplifier will play the full range of the audio signal. This switch has no effect on the Speaker Level inputs and outputs.
NOTE: Speaker Level output has a 100 Hz high pass filter that is neither adjustable nor defeatable. Using this output requires the Speaker Level [not the Line] Inputs to be used.
4. Phase Control: Changing the phase [Phase-Integration ] will change the way that the subwoofer(s) and main speakers interact with each other at the crossover frequency. Rotating this control from 0 degrees through 90 degrees to the 180 degrees position may result in more or less mid-bass depending on the relative location and phase of the main speakers to the subwoofer(s). Adjust control to optimize the interaction of subwoofer with main speakers.
5. Low Pass Frequency Control: This control allows you to set the subwoofer’s crossover frequency anywhere from 40Hz to 180Hz. Try initially setting control at 12:00.
6. Level Control: This control allows you to adjust the output level of the Subwoofer to match that of the rest of the audio system. Reminder! Set the Level Control to the minimum setting before initially plugging the amplifier into an A. C. wall outlet and also before initially turning on and/or testing system for correct settings. Try an initial setting of this control at the 9:00 position when first establishing audio setup and balancing.
