User manual B-52 ACT18X

[. . . ] Read all the instructions before attempting to use the ACT-18X. Follow all instructions contained in this manual. Keep these instructions in a safe place where they can be found and referred to in the future. Use common sense in operating your ACT-18X and heed all warnings included in your operating manual. [. . . ] Do not bypass or defeat the grounding or polarization means used on the ACT-18X amplifier. Make sure all blades on the polarized power plug are fully inserted into the AC mains power receptacle. Ensure the power cord is not stretched, pinched, chafed, or otherwise damaged. Ensure the power cord is routed safely and secured to avoid the possibility of someone tripping over it. 3 ACT-18X SUBWOOFER FEATURES AND USAGE Numbers in this section refer to the numbered controls opposite 1) LEVEL CONTROL: Sets the volume of the subwoofer without influencing the volume of the satellites the satellites, or the full range outputs on the panel mounted XLR connectors. 2) PHASE SWITCH: Allows the user to reverse the direction of excursion at low frequencies. This is to help in getting the subwoofer to move in proper "PHASE" with the satellites, so that the sound in the crossover region from the satellite and subwoofer add instead of subtract. 3) POWER INDICATOR: The AC Mains Power rocker switch located on the lower left hand side of the amplifier turns on the AC mains power to the amp. A failure to light the Red rocker switch indicates lack of power and/or a blown AC mains fuse. When the very lowest bass frequencies are removed from the satellites, this will increase your dynamic range, (let you play it louder) lower your distortion, and improve the sound of the system relative to what you would hear with the full range signal sent to your high frequency satellites. (See diagram on page 6 for details) 8) EXTERNAL SPEAKER ON/OFF SWITCH: When using the powered ACT-18X without a second passive subwoofer (the ACT-18XS), this switch should be in the off position. IF IT IS NOT, THAT WILL REDUCE THE AVAILABLE POWER TO THE SINGLE ACT-18X SUBWOOFER. When an external, non-powered subwoofer (ACT-18XS) is connected to the ACT-18A, turn this switch on. Do not use this switch unless the volume control is all the way down (fully counter-clockwise). 9) EXTERNAL SPEAKER OUTPUT: This 4-pin Speakon-style connector is for connecting an ACT-18XS passive subwoofer to the ACT18X amplifier. Either pins 1+ and 2+ can be used as the positive connection. Either pins 1- or 2- can be used as the Negative Connection. Only connect an ACT-18XS in parallel to the ACT-18X subwoofer!!Use of any sub other than an ACT-18XS will void the warranty and may cause your amplifier to shutdown or fail. When adding subwoofers it is important that they have the same response (magnitude and phase) or one will likely subtract its output from the other (instead of adding) at some point within the range of both. 10) ON/OFF SWITCH: Turns on the AC mains power and your ACT-18 amplifier. If power is available and the amp is working properly, the Power ON/OFF switch will light up. If it does not, unplug the AC cable from the wall and then check the AC mains fuse in your ACT-18X for continuity with a multimeter or ohmmeter. [. . . ] An original dated sales receipt or legible copy of same will establish coverage under this warranty. The warranty does not cover service or parts to repair damage caused by abuse or neglect or normal wear and tear. The warranty does not cover cosmetic appearance of the cabinetry not directly attributable to defects in the original material or workmanship. If the cabinet is defective as described in this paragraph, then your sole remedy shall be repair or replacement. [. . . ]