User manual VELODYNE HGS-15X THX ULTRA 2 REV A

[. . . ] HGS-15X THX Ultra 2 Owner's Manual High Gain Servo-Controlled Audio/Video Subwoofer System IMPORTANT SAFETY INSTRUCTIONS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN Caution: To reduce the risk of electric shock, do not remove cover (or back). The lighting flash with arrowhead symbol is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point symbol is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the subwoofer. 1. Read Instructions -- All safety and operating instructions should be read before the subwoofer is operated. [. . . ] Then move the switch from one position to the other and listen for a change in low frequency output. The correct position will have a greater amount of apparent low frequency output. Subsonic - 15Hz (THX)/35Hz This adjustment alters the low frequency limit of the subwoofer. For most systems we recommend the 15Hz setting which will allow the subwoofer to deliver the maximum low bass output it was designed for. In certain movie theater installations which suggest that the extreme low bass be limited, move the switch position to 35Hz and the response will be attenuated below this frequency. Crossover switch - In/Out (THX) This switch allows the electronic crossover circuitry to be removed from the signal path. This is required in certain installations which route the signal through external processors with a crossover circuit of their own, such as the new digital units. For all other installations which do not have a separate electronic crossover we recommend you leave the internal crossover IN to provide optimum performance. Auto turn on function With this function in the "auto" position, your subwoofer can be safely left with the main power switch on continuously. The subwoofer will turn itself on automatically when an audio signal is present. If no signal is present for approximately 15 minutes, the unit will switch to standby mode. This function can be disabled by leaving the switch in the "on" position. 4 External remote jack This connection allows an auxiliary infrared remote receiver "eye" to be installed and placed where most convenient. This option is usually only required when the subwoofer is to be part of a custom installation in which the built in "eye" (located adjacent to the speaker on the front baffle) will be hidden in a location where it can not adequately receive signals from the remote. High pass crossover switch - 80Hz (THX)/100Hz This switch selects the frequency for the high pass crossover outputs. Smaller speakers with limited low frequency ability may prefer the higher 100Hz setting which will reduce the low frequencies sent to them. Larger speakers with greater low frequency output may be able to handle the 80Hz setting without strain. Power switch The master power switch is located on the right half of the unit. This switch should be set to position 1 (up) for on, and 0 (down) for off. If the unit is to be left unused for an extended period of time, the master power switch should be turned off. Detachable power cord Allows for easy replacement should the original be damaged. Line-Level Connection Figure 1 shows connection to a pre-amplifier's main outputs and returning them to your amplifier inputs. When installed in this fashion, your satellite speakers will be crossed over at 80/ 100Hz which removes the lower bass from your amplifier and speakers, enabling them to do a better job reproducing high frequencies. [. . . ] This self regulation results in extreme control over cone movement, and very accurate low distortion sound. To provide the power for driving this massive loudspeaker, we incorporated an extremely efficient Class D switching amplifier. One that is capable of running cool to the touch and providing 1250 watts (RMS) and 3000 watts peak power!At typical listening levels, the HGS-15X THX Ultra 2 produces less than 0. 5% harmonic distortion with input signals extending to 20Hz and below. [. . . ]