bose model ps28 iii manual

The Bose Model PS28 III is a premium powered subwoofer designed to deliver deep, powerful bass for home theater and music systems. It features advanced Bose technologies, a built-in amplifier, multiple input options, and user-adjustable controls for seamless integration with various speaker setups. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Powered subwoofer cabinet, built-in high-efficiency amplifier, line-level inputs, speaker-level inputs, adjustable crossover, phase control, auto-on/off circuit.

Installation

Unpack and inspect contents. Choose a stable location near a wall or corner for enhanced bass response.

1. Placement: Position subwoofer on a solid floor, away from heat sources and moisture.
2. Connect to Audio Source: Use line-level (RCA) cables from receiver's subwoofer/LFE output, or speaker wire from amplifier outputs.
3. Power Connection: Plug the AC power cord into a grounded wall outlet.
4. Initial Settings: Set crossover, phase, and level to midpoint (12 o'clock).

WARNING! Subwoofer is heavy; lift with your legs, not your back. Ensure adequate ventilation around the unit.

First-Time Setup

Power on the subwoofer and your main audio system; follow calibration steps.

1. Power Sequence: Turn on subwoofer first, then your receiver/amplifier.
2. Level Matching: Play test tone or music; adjust LEVEL control to blend with main speakers.
3. Crossover Setting: Set crossover frequency slightly above your main speakers' low-end limit.
4. Phase Adjustment: Toggle phase switch (0°/180°) for maximum bass output at listening position.
5. Auto-On Test: Play audio; subwoofer should power on automatically. Stop audio; it should enter standby after a period.

CAUTION! Do not block ventilation ports. Allow at least 2 inches of clearance on all sides.

Specifications

• Type: Powered subwoofer.
• Driver: Custom-designed long-excursion woofer.
• Amplifier Power: High-efficiency Class D or AB (specific wattage per model).
• Frequency Response: 30Hz - 200Hz (±3dB).
• Inputs: Stereo line-level (RCA), speaker-level (binding posts), LFE (mono).
• Controls: Level, Crossover Frequency, Phase Switch, Power (Auto/On).
• Power Source: 120V AC, 60Hz (or regional equivalent).
• Dimensions & Weight: Compact cabinet design; substantial weight for stability.
• Finish: Black or optional wood-grain vinyl.

Controls and Settings

Rear Panel Controls: LEVEL, CROSSOVER, PHASE, INPUT SELECTOR, POWER SWITCH (Auto/On).

Level Control: Adjusts subwoofer output volume. Start at midpoint and fine-tune to room.

Crossover Control: Sets the upper frequency limit of bass sent to the subwoofer. Match to your main speakers' capabilities.

Phase Switch: Aligns subwoofer's sound waves with main speakers for cohesive bass. Try both settings for best result.

Input Selector: Choose between LINE (RCA) and SPEAKER LEVEL inputs.

Power Switch: AUTO mode enables signal-sensing on/off. ON keeps amplifier active.

Connecting Devices

AV Receiver (Recommended): Use a single RCA cable from receiver's SUBWOOFER or LFE output to subwoofer's LINE INPUT.

1. Turn off all equipment before making connections.
2. For Stereo Systems: Use Y-adapter or connect left/right line outputs to subwoofer's L/R inputs.
3. Speaker-Level Connection: Run wires from amplifier's speaker outputs to subwoofer's SPEAKER INPUT, and from subwoofer's SPEAKER OUTPUT to main speakers (if pass-through is used).
4. Select correct INPUT on subwoofer rear panel.

Tip: Use high-quality, shielded cables for line-level connections to minimize noise.

Operation & Calibration

For optimal performance, integrate with your system's setup menu if available.

1. Receiver Setup: In your AV receiver menu, set main speakers to "SMALL" and subwoofer to "YES".
2. Crossover Setting: Set receiver's crossover to 80Hz as a starting point; adjust subwoofer's knob to match or disable.
3. Level Calibration: Use receiver's test tone and SPL meter (or built-in calibration) to set subwoofer level.
4. Fine-Tuning: Listen to familiar music/movies; adjust LEVEL and CROSSOVER for seamless blend.
5. Phase Optimization: Have a helper toggle the phase switch while you listen for the setting that produces the fullest bass.

WARNING! Avoid extreme volume levels during initial setup to prevent driver damage.

Advanced Features

Auto On/Off: In AUTO mode, subwoofer detects audio signal and powers on; enters standby after ~10 minutes of silence. Protection Circuits: Automatically limit output during overload or thermal stress; resets when condition normalizes.

Care & Maintenance

Unplug from power before cleaning. Wipe cabinet with a soft, dry cloth. Do not use solvents or abrasive cleaners.

CAUTION! Keep liquids away. Do not open the cabinet; no user-serviceable parts inside.

Regulatory Information

FCC Compliance: This device complies with Part 15 of the FCC Rules. Operation is subject to interference that may cause undesired operation. Copyright © Bose Corporation. All rights reserved. Bose and the Bose logo are trademarks of Bose Corporation. For support, visit www.bose.com or contact Bose Customer Service.

Troubleshooting

Reset: Unplug from power for 2 minutes to reset protection circuits.

Service: Contact Bose Customer Support for service inquiries. Do not attempt internal repairs.