BU2 Powered Subwoofer Model BU-2 Owner’s Manual Part # 939-8123 ®
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-2 Powered Subwoofer has 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-2 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-2 SUB RIGHT CHANNEL 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...
CONNECTING YOUR SUBWOOFER TURN OFF ALL POWER... There are several ways to connect your BU-2 subwoofer. Read this section carefully to determine which method is best suited for your installation. The BU-2 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’D) 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 HIGH LEVEL INPUT + R – – L + LOW LEVEL INPUT POWER L AUTO POWER ON OFF R + R – – L + HIGH LEVEL OUTPUT BU-2 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 ’ D) The BU-2 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 ordinary lamp cord maintaining proper polarity (+ to + and – to –). Attach the lamp cord 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 ’ D) AMPLIFIER OUTPUTS Figure 7. Method when connecting one subwoofer to satellites. RIGHT LEFT + – – + HIGH LEVEL INPUT + R – – L + LOW LEVEL INPUT FREQUENCY Hz VOLUME CONTROL 80˚ POWER L AUTO POWER ON 120˚ 60˚ PHASE -180˚ 0˚ 180˚ OFF R MIN + BU-2 SUBWOOFER PLATE R – – L MAX 50˚ 200˚ + HIGH LEVEL OUTPUT + – + – Rear View Rear View R. SATELLITE L.
OPERATION SET CONTROLS... 1. Initially set the BU-2’s Volume control ❹ (Fig. 2) to 12 o’clock. 2. Initially set the BU-2’s Frequency control ❻ (Fig. 2) to 12 o’clock. 3. Slide the BU-2’s Phase switch ❺ (Fig. 2) to the “NOM” position (for normal polarity). 4. (Optional) Slide the BU-2’s Auto Power switch ❶ (Fig. 2) to the “ON” position (otherwise “OFF” defeats auto-sensing). POWER ON... 5. Turn on your entire audio system. 6. Turn the Volume control ❹ (Fig. 2) to its mid position.
A WORD OF ADVICE The Low-Frequency Rolloff 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-2 PERFORMANCE DATA DRIVE UNITS FINISH DIMENSIONS Frequency Response: 30 ~ 150Hz, ±3dB Input Sensitivity: Low Level: 70mV High Level: 1.7V Input Impedance: Low Level: 12kΩ High Level: 5kΩ Output: 100Wrms Driver: 12" woofer Crossover Frequency: 50 ~ 200Hz (continuously variable) Cabinet Finish: Ebony Pica Width: 14-1/2" (36.8cm) Height:* 14-1/2" (36.8cm) Depth: 14-1/2" (36.8cm) * Does not include 1-3/4" (4.5cm) for feet.
® Infinity Systems, Inc. 250 Crossways Park Drive Woodbury, NY 11797 USA (516) 496-3400 • FAX (516) 682-3526 www.infinitysystems.
