User manual ATLANTIC TECHNOLOGY 212 SB

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[. . . ] Instruction Manual Model 102 SB Model 212 SB Model 422 SB High Performance Powered Subwoofers 422 SB 212 SB 102 SB 2 Safety Precautions Model 102, 212 and 422 SB Powered Subwoofer Safety Precautions Table of Contents 2 3 4 5 6 Model 102, 212 and 422 SB 102 and 212 SB Subwoofer Rear Panel 422 SB Subwoofer Rear Panel Features Connecting Your Subwoofer CAUTION: To reduce the risk of electric shock, do not remove the cover (or back). WARNING: To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture. This device generates a fair amount of heat. Make sure nothing blocks the ventilation openings on the top and bottom of the unit. [. . . ] This way you can add an additional subwoofer with minimal additional wiring. The signal that comes out of the output jacks is identical to the input signal. ON OFF Power Connection Connect the power cord to an AC outlet only after making all other connections to the subwoofer. Under such circumstances the subwoofer may work better away from the corner. Experiment to find the best position in your room. HELPFUL HINT: A particularly useful experiment is to place the subwoofer right at the prime listening position (move your couch or chair out of the way and put the sub in its place). Then play something with good bass content (preferably music), and walk around the room, listening to the subwoofer's response. When you locate an area that has an ample amount of well defined bass, you've found a good potential place to locate the sub. Figure 5 Typical arrangement for a single subwoofer in a home theater. 2. Move to corner for more bass On the 212 SB you can use the level control on the rear panel to make this adjustment. If you decide not to use an SPL meter try to set all the speaker levels the same using the Test Tones. Of course, this will be much more difficult without the meter, especially for the subwoofer. Figure 6 (422 SB only) Front Panel Variable Level Control located behind the removable grille Recess and indicator for level adjustment Fixed Position Indicator LED Subwoofer Tuning Without an SPL Meter or Test Tones Start your listening with the subwoofer Crossover control set at around 100Hz or in the Bypass position if you're using a THX Certified processor or unit with a built-in crossover. Set the phase switch to normal, and the front panel variable level control (Figure 6) to the Preset position. Play some music that you know has good bass content, and turn the level control up until you just start to hear the subwoofer working. Now, from your normal listening position, determine whether the subwoofer is playing loudly enough and filling in the bass frequencies of the music evenly. If adjustment is necessary, start by changing the setting in the processor or with the level control if your processor lacks a subwoofer level adjustment. If the bass seems too ponderous, boomy, or heavy, no matter how you set the level, try moving the subwoofer away from the wall/corner. If the bass seems too thin, try moving the subwoofer closer to the wall/ corner. Small differences in positioning can make big differences in bass response. When you find a position that seems to work well, try switching the phase switch between its two settings, listening particularly to the transition from the subwoofer to the satellites. 1. Move away from wall for less bass System Set Up When setting up a complete home theater we strongly recommend that you use a Sound Pressure Level meter. Radio Shack® has a good one that is very affordably priced (approximately $40-50). To use this meter, turn on your system, put the Processor/Receiver in the Test Mode and set its main volume control to 0dB. Sit in the prime listening position, set the SPL meter to the 70dB scale, Slow Response, and C Weighting. [. . . ] Larger speakers means a lower Low-pass crossover frequency, smaller speakers means a higher Low-pass crossover frequency. Consult the manufacturer's specified low frequency response for your main speakers to determine the appropriate Low-pass setting on your subwoofer. In the end, however, a little time spent experimenting will generally result in dramatically better bass response. RIGHT L / MONO NORMAL INVERT PHASE Care of Your Subwoofer The 102 SB, 212 SB and 422 SB are constructed from Medium Density Fiberboard. MDF is a non-resonant material ideal for speaker system enclosures. [. . . ]

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