BU Series Powered Subwoofers Models BU-80, BU-120, BU-150 Owner’s Manual Part # 200230 ®
CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING: SHOCK HAZARD – DO NOT OPEN. AVIS: RISQUE DE CHOC ELECTRIQUE – NE PAS OUVRIR. CUIDADO: PELIGRO DE CHOQUE ELECTRICO – NO ABRIR.
IMPORTANT SAFETY INSTRUCTIONS 1) Read Instructions – All the safety and operating instructions should be read before the product is operated. 2) Retain Instructions – The safety and operating instructions should be retained for future reference. 3) Heed Warnings – All warnings on the product and in the operating instructions should be adhered to. 4) Follow Instructions – All operating and use instructions should be followed. 5) Cleaning – Unplug this product from the wall outlet before cleaning.
INTRODUCTION ABOUT THIS PRODUCT... The Infinity BU Series Powered Subwoofers have been designed to enhance the bass frequencies of any audio system. This subwoofer may be used with speakers of any size. Obviously, the greatest bass enhancement will be achieved when the subwoofer is connected with speakers that do not have the capability to create deep bass. This subwoofer may be used individually, or combined with another BU Series subwoofer for even more impressive reproduction of bass frequencies (i.e.
POSITIONING POSITION WITHIN A ROOM WILL STRONGLY INFLUENCE PERFORMANCE... Since the installation of a subwoofer is somewhat more complicated than installing full-range speakers, it is essential you read this section very carefully prior to connecting the subwoofer to your system. Should you have questions relating to your installation, it is advisable to call either your dealer or Infinity’s Customer Service Department for advice.
Figure 1. This view shows the subwoofer positioned behind the right-channel satellite speaker to re-create the actual location of bass instruments in an orchestra. BU SUBWOOFER RIGHTCHANNEL SATELLITE PRIMARY LISTENING AREA Here are some useful hints: 1. Experimentation with the port direction may be useful. At times directing the port away from the listening area (to the side) may be advantageous because this may create a better blend of bass within the listening room. 2.
IDENTIFICATION OF CONTROLS AND CONNECTING AC POWER CONTROLS... Refer to Figure 2 to identify the controls of your subwoofer’s internal amplifier: ❶ High-Level Input and Output terminals ❷ Low-Level Input jacks: connect to preamplifier outputs ❸ Crossover Frequency: controls upper-corner roll-off point ❹ Power-On Indicator ❺ Phase: reverse/normal switch to flip audio-signal polarity (except BU-80) ❻ Volume Control: controls volume of subwoofer BEFORE CONNECTING YOUR SUBWOOFER...
CONNECTING YOUR SUBWOOFER TURN OFF ALL POWER... There are several ways to connect your subwoofer. Read this section carefully to determine which method is best suited for your installation. The subwoofer 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.
CONNECTING YOUR SUBWOOFER (CONT.) Figure 3b. You can use this method (2 “Y”connectors) if your preamp has only one set of outputs. OUTPUTS L (Preamp with one set of outputs) R “Y” Connector TO SATELLITE SPEAKER AMPLIFIER LEFT + L – – R + Low-Level In SPKR In L SPKR Out R SUBWOOFER PLATE RIGHT When using a single subwoofer, you MUST use a pair of stereo low-level leads from your preamplifier’s outputs.
CONNECTING YOUR SUBWOOFER (CONT.) The subwoofer may be connected to your system using the HIGH-LEVEL INPUTS (4) on the plate located on the rear panel of the subwoofer. Use speaker wire, maintaining proper polarity (+ to + and – to –). Attach the speaker wire to the left and right HIGH-LEVEL INPUTS on the subwoofer and the other ends to the proper left and right OUTPUTS on your amplifier or receiver (see Figure 5).
CONNECTING YOUR SUBWOOFER (CONT.) AMPLIFIER OUTPUTS Figure 7. Method when connecting one subwoofer to satellites. LEFT + + RIGHT – L + – – – R + Low-Level In SPKR In Crossover Frequency Power Volume L Phase SPKR Out R 50 150 Min Max SUBWOOFER PLATE + + – – Rear View Rear View L. SATELLITE R. SATELLITE Depending on whether you are using one or two subwoofers, connecting your satellites can be accomplished in one of two ways.
OPERATION SET CONTROLS... 1. Initially set the subwoofer’s Volume control ❻ (Fig. 2) to the minimum position. 2. Initially set the subwoofer’s Crossover Frequency control ❸ (Fig. 2) to 12 o’clock. 3. Set the subwoofer’s Phase switch ❺ (Fig. 2) to the “NOM” position (for normal polarity) (except BU-80). POWER ON... 4. Turn on your entire audio system and play any music source. 5. Turn the Volume control ❻ (Fig. 2) to its mid position.
A WORD OF ADVICE The Low-Frequency Roll-off and Volume controls may be set anywhere within their rotation. However, it will be a most unusual circumstance if you have to set the Volume control completely clockwise. This may indicate an unbalanced condition in your system (too much bass) or an especially large room or room placement may not be correct. Try several other locations before concluding that the Volume control must be set at maximum.
CARE OF YOUR SUBWOOFER Your Infinity subwoofer cabinet is finished with a heavy-duty, high-quality vinyl which requires very little maintenance. Keep the cabinet clean by dusting it occasionally with a damp cloth or use a good quality furniture polish to maintain its original luster. (When using aerosol products, always spray the cloth, not the speaker, to prevent any of the product from drifting onto the electronics of the unit.
SPECIFICATIONS – BU SERIES PERFORMANCE DATA DRIVE UNITS FINISH DIMENSIONS BU-80 Frequency Response (±3dB): 45Hz ~ 150Hz BU-120 BU-150 30Hz ~ 150Hz 28Hz ~ 150Hz Output (RMS): 75W 150W 200W Driver: 8" 12" 15" Crossover Frequency: 50Hz ~ 150Hz 50Hz ~ 150Hz (continuously variable) (continuously variable) 50Hz ~ 150Hz (continuously variable) Cabinet Finish: Ebony Pica Ebony Pica Ebony Pica Height:* 11-1/2" (29.2cm) 14-1/2" (36.8cm) 17-3/4" (45.1cm) Width: 11-1/2" (29.
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