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When an audio signal is present, the power LED will glow green. Power consumption in the standby mode is negligible. L/ MONO HI LEVEL INPUT THX INPUT VARIABLE INPUT R INTHRU THRU Out Left Sub Woofer Right Sub Woofer IN L/ MONO HI LEVEL INPUT THX INPUT VARIABLE INPUT R INTHRU THRU IN aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa0 11 Models 222 PBM, 262 PBM and 352 PBM THX tlantic ATECHNOLOGY Voltage Selection The Atlantic Technology series of subwoofers allows operation with either 120 or 240 volts AC 50-60 Hz. Please make sure that the voltage selector switch shows the correct voltage for your area before plugging the unit in. The Figure 4: voltage can be easily changed by moving the switch to The fuse is located next the correct voltage and installing the proper fuse and to the ISE power cord. To change the fuse, remove the power AC socket cord, insert a screwdriver tip into the notch in the side of the fuseholder, and pry it out. Replace with the correct value fuse and push back into place. The Insert voltage settings and fuse values are marked adjacent to screwdriver tip here the voltage selector. Placement Moving the subwoofer towards the corner increases bass level, but may emphasize one frequency predominantly (Figure 5). Moving it away from the wall will reduce the bass output, but will yield flatter response. You can adjust the level control accordingly to compensate for room placement. Home THX Subwoofer Applications: The 352 PBM THX Two 352 PBM THX subwoofers are required for proper THX operation. A single, larger subwoofer could have been used effectively, but Atlantic Technology opted for dual subs from both a performance standpoint, (smoother bass, less room interactions) and aesthetic standpoint, with smaller cabinets being easier to place in the room. Important Note: The variable input level control and the low pass crossover control have no effect when the THX input is used. The correct input level and crossover frequency have been incorporated into all THX certified processors and receivers. The Atlantic Technology 352 PBM THX Powered Subwoofer meets or exceeds all THX performance specifications. When two subwoofers are used, whether for Home THX operation, regular Dolby Pro Logic, or Dolby AC-3, they should be placed asymmetrically; that is, in slightly different positions on each side of the television (Figure 6). This will help to attenuate room resonances that are common to symmetrically positioned subwoofers. aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa0 12 Models 222 PBM, 262 PBM and 352 PBM THX tlantic ATECHNOLOGY Figure 5: Typical arrangement for a single subwoofer in a home theater. Start here Less Bass More Bass Figure 6: Assymmetrical arrangement for 2 subwoofers in a home theater, for example, one farther from the Be sure subwoofers are wall than the other, placed asymmetrically one closer to a corner, etc. aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa0 13 Models 222 PBM, 262 PBM and 352 PBM THX tlantic ATECHNOLOGY Operation First, with your receiver/amplifier’s power off, set the subwoofer’s volume by turning the variable input level control on the front of the unit to the 8:00 o’clock position, and the low pass control on the back panel set to 80. Next, turn on your system and play some music. Adjust the input level and low pass filter until the bass seems smoothly integrated between the subwoofer(s) and the main speakers without being overpowering. The Phase Invert Mode A subwoofer operating out of phase with the rest of the system will not provide optimum low frequency performance. Also, the correct subwoofer phase can enhance room acoustics. Since there is so much variation in the industry regarding phase, and no standards have been established, a switch that will reverse the phase of the subwoofer is provided on the subwoofer amplifier’s rear panel. Listen to a monoraul musical source with strong bass content. (For example, you can use the mono switch on an FM tuner or preamp, or use a Y-connector on the outputs of one of your source components to get a mono signal.) Experiment with the position of the phase switch to get the most extended bass. It should be obvious which is the correct setting. A Word About Center Channel Modes Many surround processors and surround receivers feature a “wide” and “normal” mode for the center channel speaker. Atlantic Technology recommends that the center channel be operated in the “normal” mode when using a powered subwoofer. The “wide” mode will extend the bass response of the center channel speaker and this, combined with the bass output of the subwoofer, will result in an unnatural heaviness or boominess to the bass output of the system. The center channel speaker will also sound more dynamic and the intelligibility of the system will generally be improved when operated in the “normal” mode. aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa0 14 Models 222 PBM, 262 PBM and 352 PBM THX tlantic ATECHNOL...
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