User manual VELODYNE VA 907.2

[. . . ] Ventilation -- The subwoofer should be situated so that its location or position does not interfere with its proper ventilation. For example, the subwoofer should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or placed in a built-in installation such as a bookcase or cabinet that may impede the flow of air through the ventilation openings. Heat -- The subwoofer should be situated away from heat sources such as radiators, heat registers, stoves, or other subwoofers that produce heat. Power Sources -- The subwoofer should be connected to a power supply only of the type described in the operating instructions or as marked on the subwoofer. [. . . ] Is unit receiving an input signal from your source?Have all controls on subwoofer (volume, crossover, phase, etc. ) been properly set?If unit has been running at high levels, one of the protection circuits may be engaged. Has the speaker's voice coil started to heat up?If the protection circuitry is active, the unit may cycle on and off until operating parameters return to normal. Under more serious conditions, the unit may shut off completely. Normal operation will return upon cooling, but you may be required to turn the power off and then on again to reset the unit. The following conditions require service by a qualified technician: 1. The unit does not appear to operate normally or exhibits a marked change in performance. Some part of the cabinet or circuitry is physically damaged. Product Features & Controls q Built-in 100 watt (RMS) power amplifier q Subwoofer Direct - switchable crossover bypass q Adjustable (40 to 120 Hz) low-pass crossover q Passive (85 Hz fixed) high-pass crossover q Line-level inputs & outputs q Speaker-level inputs & outputs q Signal sensing auto turn on/off with bypass option q Variable volume control q Selectable phase control (0 or 180 degrees) q Anti-clipping circuitry q Magnetically shielded for video use q Dual staggered low-pass crossover; 12dB/octave initial, 24dB/octave ultimate q Gain compression circuit to protect woofer from over excursion q Input overload protection continued. . Thank you for purchasing a Velodyne! 9 2 Installation Your new VA-907. 2 subwoofer system provides for a number of installation options. Read all the installation information below in order to determine which installation option is best for your system. Remember to perform all installation procedures with system power turned off. Inputs Your new VA-907. 2 subwoofer is equipped with both speaker-level and line-level inputs. Use the LINE-IN jacks when connecting your subwoofer to a pre-amp, signal processor, or line-level crossover. The FROM AMPLIFIER jacks connect directly to the speaker outputs of a integrated amplifier or receiver. Your amplifier section will notice no additional loading effects when you use these inputs because of their high impedance. Note Do not use both LINE-IN and FROM AMPLIFIER inputs simultaneously. Polarity is critical when using speaker level inputs. Reversing the polarity of speaker level inputs can damage the unit. Volume control This control allows you to balance the output from the subwoofer to the main speakers in your system. This control should be set to achieve similar volume level from both the main speakers and subwoofer. [. . . ] Note If not using an external crossover, you should use the built-in crossover for optimal performance. Subwoofer out from A/V Processor From the low pass output of your signal processor Install into right or left RCA line in connector in the back of the subwoofer or use a "Y" connector adapter into both right and left RCA line in connectors in the back of the subwoofer, and switch the crossover switch to "out". VOLUME LOW-PASS CROSSOVER CAUTION! Speaker-level connection Figure 2 shows an easy way to connect your VA-907. 2 subwoofer directly to your receiver or integrated amplifier. When connected in this fashion, your satellite speakers will be crossed over at 85 Hz, which removes the lower bass from your speakers thus, enabling them to do a better job reproducing high frequencies. You may also connect your satellites directly to your receiver or amplifier along with the subwoofer if you wish to bypass the internal high-pass crossover. To avoid damage to your main amplifier, be sure to maintain correct polarity when making all connections. [. . . ]