User manual ATLANTIC TECHNOLOGY T70.1 PBM INSTRUCTION MANUAL

[. . . ] Its massive magnetic motor assembly and high temperature component parts deliver high performance and exceptional reliability. A sealed enclosure for low distortion and deep bass output Sealed enclosure designs are inherently low in distortion and naturally deliver deep, smooth bass response with a gradual and predictable roll-off below resonance. As with all Atlantic Technology subwoofers, we have paid inordinate attention to giving you accurate musical bass reproduction along with terrific special effects. A linear power high current Class A/B amplifier conservatively rated at 125 watts RMS The T70. 1 PBM's custom-designed discrete amplifier has been precision matched and equalized to its 10" driver. [. . . ] Atlantic Technology does not recommend plugging the subwoofer into the switched outlet of an amplifier, preamplifier, or receiver. The power demands of the subwoofer amplifier may exceed the power rating of the switched outlet and may damage the equipment. The T70. 1 PBM is totally automatic in its operation. The automatic on/off circuitry will only activate the subwoofer in the presence of an audio signal from your audio/video system. After 7-12 minutes 7 Model T70. 1 PBM with no signal detected from the rest of the system, the amplifier will shut itself off and go into standby mode. Power consumption in the standby mode is negligible. Standby operation can be completely bypassed by placing the "Auto" switch in the "On" position. In this mode, the subwoofer will be controlled by the position of the Main Power switch. Placement and Operation Generally speaking, the best location for your new Subwoofer will be in the front of the room, in or close to a corner (Figure 2). Every room has its own unique sound characteristics, and flexibility in the exact placement of the subwoofer is always desirable. The closer the subwoofer is placed to a wall and especially a corner, the more and deeper the bass response you will hear. However, in some rooms, corner placement can produce too much bass or a "one note" boomy effect. Under such circumstances the subwoofer may work better away from the wall or corner. You should experiment to find the best position in your room. Figure 2: Typical arrangement for a single subwoofer in a home theater. Start here Less Bass More Bass Helpful Hint: A particularly useful experiment is to place the subwoofer right at the prime listening position (move that couch or chair out of the way and put the sub in its place). Then play something with lots of good bass (preferably music), and walk around the room, listening to the subwoofer's response. When you locate an area that has ample amounts of well defined bass you have found a good potential place to locate the sub. Dual Subwoofer Placement When two subwoofers are used you may wish to place them asymmetrically; that is, in slightly different positions in the room (Figure 3). This will reduce common mode room resonances that typically occur with symmetrically placed subwoofers. Another good option is to place the subwoofers in the same corner. Several tests have shown this to be a viable means of producing smooth bass response in many rooms. 8 Atlantic Technology® Figure 3: Assymmetrical arrangement for 2 subwoofers in a home theater, for example, one closer to a corner than the other. Subwoofer Tuning Using the Variable Level Control Assuming that you do not have access to a Sound Pressure Level meter for system set up, start your listening with the subwoofer crossover control set at approximately two-thirds of its range (which corresponds to approximately 100Hz), the phase switch set to normal, and the variable level control set to the bottom of its range (fully counterclockwise facing the back of the woofer). 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 of the rear mounted level control to compensate. [. . . ] Ground loop through antenna or cable TV system input. Input source connected to HI LEVEL inputs is wired out of phase. Possible Solution Plug into a working outlet. Check all connections, then try another input cable. Check all connections, then try another input cable. [. . . ]