User manual VELODYNE VA 1215XII

[. . . ] To prevent fire or sh ock hazard, do not exp ose this eq uip ment to rain or mois ture. To avoid ele ctrica l sh ock, do not open sp eaker enclosure oramp chassis cover. Please obs erve all warnings on the equipment itse lf. There are no user se rviceable parts inside. [. . . ] With larger speakers, you might start with this con trol set lower, such as 80hz. A bypass switch is also provided if you wish to use an external crossover. If you are not using an externa l crossover, we recom mend that you use the one provided with in the unit for optimum performance. Phase adjustment This control allows you the ability to compensate for having the subwoofer in a different location than the main speak ers. Ideally, you will have the sound from the subwoofer reach the listening position the same time as the sound from the main speake rs. However, if the distance from the listening position to the subwoofer and the distance from listening position to the main speakers diffe rs, the sound from each will reach your ears at adltterent time . This control allows the signal to be delayed up to 180 degrees so th e output of the subwoofer will blend in to that of your main speakers without any canc ellation. Vi deo/Audio swit ch Many listeners prefer an "emphasized" low end on mo v ie soundtracks. This switch sets the VA-1215XII for an additional 3dB of output when in video mode . Auto t urn on switc h The auto turn on switch allows the user to bypass the auto turn o n function if desired. Wh en set in the "auto" mode with main power o n, the VA-1215XII will turn itself on when an input signal is present. If no signal is present, after several minutes the unit will shut itself off. Whe n set in the "on" mode, the auto turn on/off function is byp assed and the unit will be on wheneve r the main power switch is on. Hi g h pass crossover switch This switch selects the frequency for the high pass crossove r. This cross over is functional on both line and speaker-level outputs. Smaller speakers with limited low frequency output may prefer the cca tiaued. . Installation Your new VA-1215XII subwoofer system provides for a number of installation options. Read all the installation information below in order to dete rmine which installation option is best for your system. Rem em ber to perform all in stall at io n procedures with system power turned off. Inp uts Your new VA-1215XI I subwoofer is equ ipped with both speaker level and line-leve l inputs. Use the LINE -IN jacks when connecting your subwoofer to a pre- amp, signal processor, or line-level cross over. The FRO M AMPLI FIER 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 0 0 n ot use bo th LIN E-IN and FROM AMPLIFIER inp uts simuue neously . Volume control This co ntro l allows you to bala nce the output from the subwoo fer to the mai n speakers in you r system. Th is control should be set to achieve simila r volume level from both the main speakers and subwoofer. Low-pass crossover Both sets of inputs sum the left and right channels toge ther and the resulting signal is passed through an adjustable low-pass crossove r before being amplified . Th e crossover control allows you to adjust the upp er limit of the subwoofer's frequency response from 40 to 120 hz. Th e subwoofer's 'response will begin rolling off above the frequency you set this control to. higher 100hz setting which will reduc e the low frequencies sent to them . Larger speakers wit h greater low frequency output may be able to handle the 80hz selli ng witho ut strain. Power switch Th e ma ster power switch is located on the right half of the unit. This rocker style switch is the mai n on/off for the unit. [. . . ] If un it has been running at high levels, one of the protection c ircuits ma y be engaged. Has the b uilt-in amplifier overheated? Has the speaker's voice-coil started to heat up? peak Woofer Magnet Voice Coil Passive Radiator Inputs Outputs Warranty Weight Class AlB, 250 watts, 500 walts 12" forward firing 55 oz. 2" 15" downward firing Line-level & speaker-level Line-level & speaker-level One year (parts & labor) 67 Ibs. (approx. ) If the p rotection circuitry is active, the unit may cycle on and off until op eratin g para meters return to normal. Under more serious condi tions , th e unit may shut off completel y. [. . . ]