User manual VELODYNE ULD-12

[. . . ] Please refer all se rvice questi ons to yo ur authorized Velodyne dea ler. Prior to installation Please unpack the system carefully . Remove all staples used to seal the carton as they can scratc h the cabinet. Please save the carton and all packaging mate rials fo r future use. [. . . ] Object and Liquid Entry - care should be taken so thai objects do rot fall ard liquids are not spilled onto the enclosure. , 16. Damage Requirtng Service - The subwoofer should be serviced by qualified service personnel when: a. The power·supply cord or plug has been damaged. Objects have fallen or fiquid has been spilled into the subwoofer. The subwooler docsnot appear to operate normally or exhibits a marked change in performance. TIle subwooler has been drcpped or damaged. 17_ ServO ng - The user sboud not atterrot 1 service the sLtlwoofer beyond what is descriJedin the operating 0 instructions. 1. 2. 3. Product Features & Controls · 12" forward firing woofer with 2" voice coil & 55 oz. magnet · 15" downward firing passive radiator · Built-in 250 watt (RMS) power amplifier · Adjusta ble (40 to 120hz) low-pass cross over with bypas s option · Selectable (80 or 100hz) high-pas s crossover · Line-level inputs & outputs · Speaker-level inputs & outputs with 5 way binding post connec tions · Signal sensing auto turn on/off with bypass option · Variable volume control · Variable phase contro l (0 to 180 degrees) · Two position audio/video listening selection switch (+3dB, vide o) · Response, 22 hz to 120 hz, +/- 3dB · Detachable power cord (avai labl e on some versions) · Magnetically shielded for video use · Dual staggered low-pass crossover; 12dB/octave initial, 24dB/ octave ultimate All other servicing should be refened to qualifiedservice personnel. · Gain com pression circuit to protect woofer from over excursion · Input ov erload protection · Th erm al power sensing to protect woofer's voice coil from burnout · Power on LED (green) You should set the crossover frequency to obtain a smo oth a nd sea mless transition from the subwoofer to the main speakers in yo ur system. If your main speakers are small er units with limited low frequency output, you may wish to choose a higherf requency (such as 100-120hz) than you would with larger speakers which have greater low frequency output. 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. Some surro und sound processors/receivers, including the Dolby AC3 sys tem with there . 1 channel outputs, have a "subwoofer out" jack that is already crossed over and designed to be used with a conve ntional amplifier and speaker. Combining both an external crossover and the one internal to the subwoofe r may result in low output and increased noise . In these cases, to optimize your subwoofer pe rformance you should bypass the intern al cross over in your Velodyne subwoofer. Line-level connection Figure 1 shows connection to a pre-amplifier's main outputs and returning them to your amplifier inputs. W ~ e n installed in this fashion, your satellite speakers will be crossed over at 80/1O Ohz which remove s the lower bass from your amplifier and speakers, enab ling them to do a better job reproduc ing high frequencies. By utilizing this method, you will have a bi amplified system, gaining improved power and headroom for your syste m. ~ To bypass the crossover within the subwoofer, simp ly locate the switch marked "normal/bypass" on the back panel of the subwoofer and set to the "bypass" position . This will eliminate the internal crossover function. Note If not using an external crossover, you should use the built-in crossover for optimal performance. Subwoofer out from AN 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. Figure 1: Installation using lin e-l evel (line in) inputs / "'Co. . . . -. . -0_ . . _ c. 'J1C:. tJ:l. J_::. _9~ _~O~~ O _ F'O l" ··· , . . ~ 1 H II . . . Velodyn e "" ) '@'@r@-@ , . . -, PRE-AMP MAIN OUTPUTS LEFT RIGHT =@ @J r=-'_on- - = ~« ~. --@ . ;~ft ~=::~ ( _n_ ) ~. . . . :::-: :-. :-- Speaker-level connectio \ " Figure 2 shows an easy way to connect your ULD-12 subwoofer directly to your receiver or integrated amplifier. When connected in this fashion, your satellite speakers will be crossed over at 80/1OOhz, which removes the lower bass from your speakers thus, enabling them to do a better job reproduc ing high frequencies. [. . . ] Following is a simple troubleshooting guide to assist you. Ve rify unit is plugged in and power outlet used is active . Is unit receiVing an input signal from your source?Have all controls on subwoofer (volume, crossover, phase , etc . ) been properly set? [. . . ]