User manual INFINITY BU1

[. . . ] BU1 Powered Subwoofer Model BU-1 Owner's Manual Part # 930-7304 ® CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: SHOCK HAZARD, DO NOT OPEN. AVIS: RISQUE DE CHOC ELECTIQUE ­ NE PAS OUVRIR. CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (0R BACK) NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. THIS INFINITY PRODUCT IS DESIGNED FOR 120-VOLT USE ONLY! [. . . ] Setting the subwoofer's volume level too high will result in an overpowering, boomy bass. Setting the volume level too low will negate the effect of the subwoofer. The metal plate acts as the heat sink for the subwoofer's internal amplifier. Do not place pillows or other objects against it. We recommend placing the BU-1 at least 2 to 3 feet away from a television or a computer's discdrive system to prevent smearing the colors of the TV picture or erasing of the magnetic drive. Here are several additional facts on installation that may prove useful. It is generally believed by most audio authorities that low frequencies (below 125Hz) are nondirectional and, therefore, placement of a subwoofer within any listening room is not critical. Make sure the subwoofer's ON/OFF switch is in the "OFF" position. If using an unswitched AC outlet on your receiver or amplifier is not possible, connect your subwoofer to an unswitched AC wall outlet. The BU-1 includes an "Auto-Sensing" circuit that automatically turns the subwoofer on when detecting music or voice signals. The absence of an audio signal for approximately six minutes will cause the auto-sensing circuit to shut down the system. Figure 2. HIGH LEVEL INPUT + R ­ ­ L + LOW LEVEL INPUT L VOLUME CONTROL FREQUENCY Hz 80° 60° 120° 180° POWER AUTO POWER ON OFF R MIN MAX 50° 200° + R ­ ­ L + HIGH LEVEL OUTPUT WARNING: ® TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: SHOCK HAZARD-DO NOT OPEN. AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR. NRTL/C UL-1492 MODEL BU1 120V~60Hz 130W HCM NOT SUITABLE FOR ALL IN-WALL MOUNTING 120V ~, 60Hz 130W 4 x Powered Subwoofer BU-1 ­ Owner's Manual CONNECTING YOUR SUBWOOFER TURN OFF ALL POWER. . . There are several ways to connect your BU-1 subwoofer. Read this section carefully to determine which method is best suited for your installation. The BU-1 may be fed directly with a low-level signal taken from your preamplifier's output by using the second set of output jacks on the rear of your preamplifier (see Figure 3a). If your preamplifier has only one set of outputs you may use two (2) "Y" connectors (see Figure 3b) to connect your subwoofer. Use standard shielded leads terminated at each end with male RCA connectors. Connect one end of each stereo pair of leads to your preamplifier's left and right outputs and connect the other end to the corresponding left and right LOW-LEVEL INPUTS (1) on the subwoofer. IMPORTANT! If you are using a tube preamplifier and the connecting leads will be longer than 10 feet (3 meters), we recommend not using the above connection method. A tube preamplifier may not be able to handle the capacitance introduced by leads over 10 feet in length. Instead, try using the high-level connection methods listed on page 7. Figure 3a. Low-level signal can be used from your preamp's output by connecting second set of output jacks to the rear of your amplifier. OUTPUTS L R (Preamp with two sets of outputs) L R TO SATELLITE SPEAKER AMPLIFIER LEFT HIGH LEVEL INPUT + R ­ ­ L + LOW LEVEL INPUT AUTO POWER ON OFF L POWER R + R ­ ­ L + HIGH LEVEL OUTPUT BU-1 SUBWOOFER PLATE RIGHT Powered Subwoofer BU-1 ­ Owner's Manual x 5 CONNECTING YOUR SUBWOOFER (CONT'D) Figure 3b. You can use this method (2 "Y"connectors) if your preamp has only one set of outputs. OUTPUTS L R (Preamp with one set of outputs) "Y" Connector TO SATELLITE SPEAKER AMPLIFIER LEFT POWER AUTO POWER ON OFF HIGH LEVEL INPUT + R ­ ­ L + LOW LEVEL INPUT L R + R ­ ­ L + HIGH LEVEL OUTPUT BU-1 SUBWOOFER PLATE RIGHT When using a single subwoofer, you MUST use a pair of stereo low-level leads from your preamplifier's outputs. When using two subwoofers, one for the left and another for the right channel, connect the left preamplifier output to BOTH the left and right LOW-LEVEL INPUTS of the subwoofer used for the left channel by using a Female-to-Male "Y" connector at the subwoofer's input and the right channel preamplifier output to both jacks of the right channel subwoofer in the same manner (see Figure 4). [. . . ] In the event that the subwoofer is located so far from the listening area that its effect is not as prominent as desired, you may find that reversing the phase of the High-Level Input wires may help. Connect the "+" speaker output terminals to the "­" High-Level Input terminals of the subwoofer on BOTH channels. (Reversing the phase on only one channel will cancel out the signal to the subwoofer's amplifier, resulting in less output from the subwoofer. ) OVERDRIVE PROTECTION Automatic limiting circuitry helps prevent overdriving a connected subwoofer by softly clipping the input signal if it exceeds a predetermined threshold. Depending on the level, you may or may not hear slight distortion on musical peaks. [. . . ]