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Retain this manual for future reference. 2. The subwoofer should be placed at a ventilated, dry and cool location, away from any heat sources such as radiators or amplifiers. Do not obstruct the amplifier in the C-11 from ventilation. It is necessary that air can flow around the finned heat sink on the rear panel of the amplifier. 3. Do not use the subwoofer near water or expose it to rain or moisture. 4. Always unplug the power cord first when making connections. Switch power on only after you check and make sure all connections are made correctly. 5. Unplug the power cord from the outlet when you are not going to use the subwoofer for a long period of time. 6. To clean, unplug the power cord from the outlet first. Use a damp cloth only to wipe dust off the surface. Do not use any liquid cleaners. 7. Do not put coffee cups or other objects on top of the cabinet. They can be shaken off when the subwoofer is in operation as it can produce a lot of vibration. Introduction C-11 is a home theater subwoofer equipped with a build-in equalizer. The 5- band equalizer is a powerful tool in correcting anomalies of subwoofers caused by room acoustics. It will greatly increase subwoofer performance when used properly. In the real world, subwoofers generally do not have a flat frequency response. Only in ideal conditions such as open air or large anechoic test chambers do they have a perfect response measurement. When a subwoofer is played in a listening room, the bass frequencies can be up or down 10 dB from the ideal response. The sound can have a “boomy” or ill-defined bass that will impair the overall musical performance. The &&P 5-band equalizer is designed to control offending bass notes that “booms” louder than they should. It features precisely aligned 1/3-octave equalization filters that are only found on the best professional audio equipment. The cabinet has been designed using extensive computer modeling for the best possible alignment between driver and box. Coupled with two high excursion 1-1 proprietary 10” drivers, the C-11 produces clean, powerful and controlled bass. Three large rear-firing vents ensure ventilation of both driver and amplifier for cool running at high power. The vent's large bore and “gas flowed” cross-section reduces air turbulence that causes audible distortion. Functions and Connections Please refer to Fig. 3 (Front control panel) and Fig. 4 (Back panel) for functions on C-11 Subwoofer amplifiers © Power switch on/off Upper position: Power on Lower position: Power off Middle position: Auto on At this position the subwoofer amplifier is in a stand by mode, awaiting an input signal. When there is no signal, the amplifier is shut down. As soon as the signal appears, the amplifier switches on. If signal is absent, the amplifier will shut down automatically after a pre-determined period of time. The power indicator is red when the switch is at OFF position, and green when the switch is at ON or AUTO position. (2) Volume Control Use this control to balance the level of the woofer with the level of your main speakers. (3) Crossover Frequency control If you are using small loudspeakers (4”to 6” woofers) in your main system, you will need to set the crossover frequency at a high position (100 to 160 Hz). If your main speakers have larger woofers (8” and above) you will need to set the crossover frequency to much lower position (40 to 80 Hz). Generally, the larger the speaker, the greater the low frequency output will be. If the frequency control is set too high, the bass will appear “boomy” due to outputs of subwoofer and main speakers overlapping each other. If it is set too low, the bass will be ill defined and the subwoofer will sound detached from the rest of the system. @ Phase Control Use this control to determine the best possible bass performance of your system. There can be interference between your main speakers and subwoofer at the frequency where they cross over due to placement, room acoustics and type of main speakers used. By carefully positioning the subwoofer in the room in combination with the level and crossover control, you should be able to get a seamless transition between your main speakers and subwoofer. Start with the full anticlockwise 0° position. This means that the subwoofer will push out positive pressure wave corresponding to a positive electrical input. The 180° full clockwise position inverts this so the subwoofer will put out a negative 1-3 pressure wave. You can use this position if you are unable to get a good integration between the subwoofer and main speakers. (5) Equalizer on/off At “off” position, the amplifier will function normally without the effect of the 5-band equalizer. © 5-band Equalizer Please refer to “Setting up EQ for the Room” (!) High Level Inputs L&R These inputs should be connected to the left and right speaker terminals of your amplifier/receiver, if you intend to connect the subwoofer using this option i...