User manual BLUE SKY SUB 8 UNIVERSAL

[. . . ] Blue Sky International 70 Sea Lane Farmingdale, NY 11735 www. abluesky. com 100-Watt compact subwoofer with adaptive x-over Blue Sky | SUB 8 Universal Owner's Manual Version 1. A | December 27, 2004 Contents Important 1 2 3 4 5 6 7 8 9 10 11 12 Safety Instructions _ __ __ __ __ __ __ __ __ __ _ Page 3 SUB 8 Universal Introduction _ __ __ __ __ __ _ Page 4 Important notes about the SUB 8 Universal and this Owner's manual _ __ __ __ __ __ __ __ __ __ __ _ Page 4 SUB 8 Universal - What is included?_ __ __ __ _ Page 4 Quick Setup / with filter setting instructions _ _ Page 5 System Signal Connections _ __ __ __ __ __ __ _ Page 6 A Tour of the Amplifier and I/O _ __ __ __ __ _ Page 7 Expanded Calibration Guide _ __ __ __ __ __ _ Page 8 Subwoofer Placement Guide _ __ __ __ __ __ _ Page 9 Technical Information _ __ __ __ __ __ __ __ __ _ Page 10 SUB 8 Universal Cabinet Dimensions _ __ __ __ _ Page 11 Factory Service Instructions _ __ __ __ __ __ __ _ Page 12 General Contact Details _ __ __ __ __ __ __ __ _ Page 13 Contents Safety Instructions 1 READ INSTRUCTIONS - Read all safety and operating instructions before operating this product. RETAIN INSTRUCTIONS - Retain these safety and operating instructions for future reference. HEED WARNINGS - Follow all warnings on this product and in the operating instructions. [. . . ] VARIABLE CUTOFF FREQUENCY CONTROL KNOBS - These controls are for adjusting the dual 24dB per octave low and highpass filters. It is recommended that the SUB 8 Universal filters be set one octave above the natural roll off of the nearfield monitors that are being used with the SUB 8 Universal. To activate these variable filters, the VARIABLE / SAT 5 FILTER SWITCH - must be in the up position (VARIABLE). For more information see item 10 on page 4 [Quick Setup / with universal filter instructions]. SUB GAIN - This knob controls the input sensitivity of the subwoofer amplifier only. When set to the reference position a 100mV signal at the input equals 90dB output at a meter. SUB Out - This balanced XLR output can feed additional subwoofers for increased bass performance and should be connected to the SUB IN of an additional Blue Sky SUB 8 / SUB 8 Universal. The output contains the summed low passed subwoofer output and the SUB IN audio. SUB IN - This XLR input can be connected to either the subwoofer output of an external bass-management controller, or the "daisychain" output of a SUB 8 / SUB 8 Universal. This input is fullbandwidth (up to approximately 200Hz) and does not use a low pass filter. Page 7 7. Expanded Calibration Guide move the output faders. Step 3 Step 4 Step 5 Mute everything and make sure the 1kHz tone is OFF . Now that the system has been electrically calibrated turn ON your 2. 1 System (SUB 8 Universal & nearfield monitors). Make sure there is nothing coming from the right channel (or any other channels). Because this signal is bandwidth limited, you don't have to worry about turning the sub off. If you have a master monitor level control, you can set the sat gain control at reference and then adjust the monitor gain control for 85 dBC. The other method is to set master monitor level to the position you want as a reference level and then use the volume controls to set 85 dBC. If you use this method you should mark the knob position with a grease pencil so you can always go back to reference level if the knob gets moved. For either method: SPL should be measured at the mix position, with the SPL meter at arms length, with the microphone at seated ear height, angled at approximately 45 degrees, and pointed at the center point between the left and right speakers. Once the left channel is set to 85dBC, repeat this step for the right channel Step 6 Feed 40-80Hz pink noise signal to the left channel only. Adjust the subwoofer level control until the subwoofer reads 85dBC (slow) at the mix position. The meter will bounce around a little, so you will need to do a mental average (I tend to filter out the peaks in my mind, so I don't set the sub too hot). The right channel should measure about the same and no additional adjustments need to be made. [. . . ] You are not just listening for the most boom, but rather where the bass is most accurate and natural sounding. Remember, because the subwoofer is basically omnidirectional, the best spot for the subwoofer can be next to, or even behind, the main monitoring area. After finding the spot where the subwoofer has the best response in the room, place the subwoofer in that location. Now, listen from the main position and confirm that the subwoofers response is similar to when the positions were reversed. [. . . ]