User manual VELODYNE SPL-1200 ULTRA DATASHEET

[. . . ] Please observe the following precautions to insure safe and proper system operation. Note: Do not leave unit in direct sunlight or use in high humidity environments!!!To prevent fire or shock hazard, do not expose this equipment to rain or moisture. To avoid electrical shock, do not open speaker enclosure or amp chassis cover. [. . . ] The subwoofer's response will begin rolling off above the frequency you set this control to. You should set the crossover frequency to obtain a smooth and seamless transition from the subwoofer to the main speakers in your system. If your main speakers are smaller units with limited low frequency output, you may wish to choose a higher frequency (such as 100 -120 Hz) than you would with larger speakers which have greater low frequency output. With larger speakers, you might start with this control set lower, such as 80 Hz. A bypass switch is also provided if you wish to use an external crossover. If you are not using an external crossover, we recommend that you use the one provided within the unit for optimum performance! Phase Adjustment - 0°/180° This control allows you to "reverse" the phase of the subwoofer's output signal 180° to correct for any possible mismatch and resulting cancellation between the subwoofer and your main speakers/amplifier. To adjust, simply listen to the system with music playing. 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. Crossover Switch - INTERNAL X-OVER/SUBWOOFER DIRECT This switch allows the internal 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. Simply move the switch to SUBWOOFER DIRECT to disengage the built-in crossover. If this occurs, simply use a "Y" adapter (available from most dealers) to allow your processor's single sub line to be fed into both L&R inputs. This will make the unit turn on at lower signal levels. www. velodyne. com SPLi Series User's Manual 5 LINE-LEVEL CONNECTION - OPTION B Figure 2 shows connection from a pre-amplifier's main outputs to the left and right inputs of your Velodyne subwoofer. You will also need to connect a second pair of RCA cables from the outputs on the back of your subwoofer to the inputs on the back of your amplifier. When the subwoofer is installed in this fashion, your satellite speakers will be crossed over at 80 Hz which removes the lower bass frequencies from your external amplifier and speakers, enabling them to do a better job reproducing the higher frequencies. By utilizing this method, you will have a bi-amplified system, gaining improved power and headroom for your system. This installation method is not as common as the method described in Figure 1. (Cables needed: 2 stereo pair of RCA cables. ) NOTE: SPL-800i is identical in features and layout to the SPL-1000i shown. . Figure 2. Installation Using Stereo Line-Level Inputs www. velodyne. com SPLi Series User's Manual 6 Speaker-Level Connections Figure 3 shows an easy way to connect your Velodyne subwoofer directly to your receiver or integrated amplifier, if it lacks line-level outputs. You may also connect your satellites directly to your receiver or amplifier along with the subwoofer. Your receiver or amplifier will not notice the additional load of the subwoofer due to the high input impedance. NOTE: SPL-800i is identical in features and layout to the SPL-1000i shown. Figure 3. Installation Using Speaker-Level Inputs . Caution!!! [. . . ] Normal operation should 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 3. Some part of the chassis or circuitry is physically damaged 1. [. . . ]