1. Introduction
The Alpine PWE-S8 is a compact, powered 8-inch subwoofer designed to enhance your vehicle's audio system with powerful and accurate bass. Its integrated amplifier and shallow-mount design allow for flexible installation in various vehicle types, including under or behind seats, in trunks, or in SUV hatches. This manual provides essential information for the proper installation, operation, and maintenance of your PWE-S8 subwoofer.
2. Safety Information
- Electrical Safety: Always disconnect the vehicle's negative battery terminal before beginning any installation. Ensure all wiring is correctly connected and fused to prevent electrical shorts or damage.
- Vehicle Safety: Mount the subwoofer securely to prevent it from becoming a projectile during sudden stops or collisions. Do not obstruct vehicle controls or safety devices.
- Hearing Protection: Prolonged exposure to high volume levels can cause permanent hearing damage. Adjust volume to a safe and comfortable level.
- Professional Installation: If you are unsure about any part of the installation process, it is recommended to seek assistance from a qualified professional installer.
3. Package Contents
Verify that all items are present in the package:
- Alpine PWE-S8 Powered Subwoofer Unit
- Wiring Harness (Power/Speaker Level Input)
- Remote Bass Level Control Knob with Cable
- Mounting Hardware (Brackets, Screws)
- Owner's Manual (this document)
4. Product Overview
The PWE-S8 features a durable cast aluminum enclosure housing an 8-inch subwoofer and a built-in Class D amplifier. Its compact dimensions allow for versatile placement within your vehicle.
Figure 4.1: Front view of the Alpine PWE-S8 subwoofer, showcasing its compact design and protective grille.
Figure 4.2: Alpine PWE-S8 subwoofer with approximate dimensions (15 inches / 37 cm in length shown for reference).
4.1 Rear Panel Controls and Connections
The rear panel provides all necessary connections and adjustment controls for integrating the subwoofer into your audio system.
Figure 4.3: Detailed view of the PWE-S8 rear panel, showing input and control options.
- PHASE Switch: Adjusts the phase of the subwoofer output (0° or 180°).
- GAIN Control: Matches the input sensitivity of the subwoofer to the output of your head unit.
- LP CROSSOVER Control: Sets the low-pass filter frequency (typically 50Hz-150Hz).
- REMOTE SUB LEVEL Input: Connects the wired remote bass level control.
- RCA INPUTS: For connecting to head units with RCA pre-outs.
- SPEAKER LEVEL INPUTS: For connecting to head units without RCA pre-outs, using speaker wires.
- POWER/GROUND/REMOTE Terminal: For main power, ground, and remote turn-on connections.
5. Setup and Installation
Careful installation is crucial for optimal performance and safety. Plan your wiring and mounting location before beginning.
5.1 Mounting Location
The compact design of the PWE-S8 allows for flexible mounting:
- Under a seat (ensure adequate clearance and ventilation).
- Behind a seat (in trucks or SUVs).
- In the trunk of a sedan.
- In the hatch area of an SUV.
Ensure the chosen location is dry, well-ventilated, and does not interfere with vehicle operation or passenger safety. Secure the unit using the provided mounting hardware.
5.2 Wiring Connections
Follow these general guidelines for wiring. Refer to the detailed wiring diagram in the full owner's manual for specific connections.
- Power (BATT+): Connect the main power wire directly to the vehicle's positive battery terminal. Use an appropriate gauge wire and install a fuse (not supplied, typically 15A-20A) within 18 inches of the battery.
- Ground (GND): Connect the ground wire to a clean, unpainted metal surface of the vehicle chassis. Ensure a solid electrical connection.
- Remote Turn-On (REM): Connect this wire to the remote turn-on output of your head unit. This signal turns the subwoofer on and off with your audio system. If your head unit lacks a remote output, some units can use speaker-level input sensing for automatic turn-on.
- Audio Input:
- RCA Input: Connect RCA cables from your head unit's subwoofer pre-out or full-range pre-outs to the RCA INPUTS on the PWE-S8.
- Speaker Level Input: If using speaker-level inputs, connect the vehicle's speaker wires (front or rear) to the SPEAKER LEVEL INPUTS on the PWE-S8 wiring harness.
- Remote Bass Level Control: Connect the provided remote control cable to the REMOTE SUB LEVEL input on the PWE-S8. Mount the control knob in an accessible location for easy adjustment.
6. Operating and Adjustments
Once installed, fine-tune the subwoofer's settings for optimal sound integration with your vehicle's audio system.
- GAIN Control: Start with the gain control at its minimum setting. Play music with strong bass and slowly increase the gain until the subwoofer output blends smoothly with your main speakers without distortion. Avoid setting the gain too high, as this can cause clipping and damage.
- LP CROSSOVER Control: Adjust this control to set the upper frequency limit for the subwoofer. A common starting point is between 80Hz and 100Hz. Experiment to find the setting that provides the best blend with your main speakers, ensuring bass notes are localized to the front of the vehicle rather than the subwoofer's location.
- PHASE Switch: Listen to music with strong bass. Toggle the phase switch between 0° and 180°. Choose the setting that produces the loudest and most impactful bass response. This corrects any phase cancellation issues between the subwoofer and main speakers.
- Remote Bass Level Control: Use this knob to conveniently adjust the subwoofer's output level from your driving position, allowing for on-the-fly adjustments based on music genre or personal preference.
7. Maintenance
The Alpine PWE-S8 requires minimal maintenance to ensure long-lasting performance.
- Cleaning: Use a soft, dry cloth to wipe the exterior of the unit. Do not use harsh chemicals or abrasive cleaners.
- Ventilation: Ensure that the subwoofer's heat sinks and ventilation areas are not obstructed to prevent overheating.
- Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion.
8. Troubleshooting
If you experience issues with your PWE-S8, consult the following table before seeking professional service.
| Problem | Possible Cause | Solution |
|---|---|---|
| No power/No indicator light | Blown fuse; Loose power/ground connection; No remote turn-on signal. | Check and replace fuse; Verify all power and ground connections; Check remote turn-on wire from head unit. |
| No sound from subwoofer | No audio input signal; Gain set too low; Head unit settings incorrect. | Verify RCA or speaker level input connections; Increase gain control; Check head unit's subwoofer output or balance settings. |
| Distorted sound | Gain set too high; Input signal too strong; Damaged speaker. | Reduce gain control; Check head unit's output level; If distortion persists at low gain, speaker may be damaged (contact support). |
| Weak or unclear bass | Phase incorrect; LP Crossover set too low; Subwoofer not properly blended. | Toggle PHASE switch; Adjust LP CROSSOVER frequency higher; Re-adjust GAIN for proper blend. |
9. Specifications
Technical specifications for the Alpine PWE-S8 powered subwoofer:
- RMS Power: 120 Watts
- Peak Power: 240 Watts
- Subwoofer Size: 8 inches
- Frequency Response: 32 Hz - 150 Hz
- Amplifier Type: Class D
- Enclosure Material: Cast Aluminum
- Dimensions (Approximate): 13.5" (L) x 9" (W) x 3" (D)
- Input Sensitivity: RCA (0.1V - 4.0V), Speaker Level (0.5V - 10V)
- Low-Pass Crossover: 50 Hz - 150 Hz (variable)
- Phase Control: 0° / 180° (selectable)
- Connectivity: RCA, Speaker Level
- Item Weight: 11 pounds
10. Warranty and Support
Alpine products are designed for reliability and performance. This product is covered by a limited warranty. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Alpine website.
For technical support, product registration, or to locate an authorized service center, please visit the official Alpine USA website or contact Alpine customer service directly. Contact information can typically be found on the Alpine website or in your product packaging.
