Introduction
Thank you for choosing the Pyramid PB918 2-Channel Car Stereo Amplifier. This amplifier is designed to enhance your car audio system with powerful and clear sound. This manual provides essential information for proper installation, operation, and maintenance of your amplifier. Please read this manual thoroughly before attempting installation or operation to ensure optimal performance and safety.
Image: Pyramid PB918 2-Channel Car Stereo Amplifier, front view.
Safety Information
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
- Always disconnect the vehicle's battery negative terminal before starting any electrical work.
- Ensure all wiring is properly routed and secured to prevent damage or short circuits.
- Use appropriate gauge wiring for power and ground connections as specified in the installation section.
- Mount the amplifier securely in a location that allows for adequate ventilation and is protected from moisture and excessive heat.
- If you are unsure about any installation steps, seek assistance from a qualified professional car audio installer.
- Do not operate the amplifier if it is damaged or malfunctioning.
Product Features
The Pyramid PB918 amplifier is engineered with advanced features for superior audio performance:
- 2-Channel Bridgeable Design: Offers flexibility for powering full-range speakers or a subwoofer.
- MOSFET PWM Power Supply: Provides efficient and stable power delivery.
- Variable Crossover Network: Includes adjustable Low Pass and High Pass filters for precise sound tuning.
- Variable Bass Boost Control: Allows for enhanced low-frequency response.
- Silver Plated RCA Input/Output: Ensures optimal signal transfer and corrosion resistance.
- Full Protection Circuitry: Safeguards against overload, short circuit, thermal, and DC offset.
- Heavy Duty Aluminum Alloy Heatsink: Designed for efficient heat dissipation and durability.
Package Contents
Upon unpacking your Pyramid PB918 amplifier, please verify that all items are present:
- Pyramid PB918 2-Channel Car Stereo Amplifier
- Mounting Hardware (screws)
- User Manual (this document)
Image: Contents of the Pyramid PB918 amplifier package.
Controls and Connections
Familiarize yourself with the various inputs, outputs, and controls on your amplifier:
Front Panel Controls
Image: Detailed view of the front panel controls and inputs.
- Low Level Input (RCA): Connects to your head unit's RCA pre-outs.
- High Level Input: For connecting to head units without RCA outputs (speaker level input).
- Input Level Control (Gain): Adjusts the input sensitivity to match the output of your head unit.
- Bass Boost Control: Adjusts the level of bass enhancement.
- Crossover Mode Switch (FULL/LP/HP): Selects the crossover operating mode.
- Low Pass Control (LPF): Adjusts the low-pass filter frequency when in LP mode.
- High Pass Control (HPF): Adjusts the high-pass filter frequency when in HP mode.
Rear Panel Connections
Image: Detailed view of the rear panel power, fuse, and speaker connections.
- Power Supply Terminals (GND, REM, +12V): Connections for ground, remote turn-on, and 12V power.
- Power Fuse: Protects the amplifier from overcurrent.
- Speaker Output Terminals (Right, Left): Connects to your speakers.
Setup and Installation
Proper installation is crucial for the performance and longevity of your amplifier. It is highly recommended that installation be performed by a qualified professional.
Mounting Location
Choose a mounting location that is dry, well-ventilated, and secure. Avoid mounting the amplifier directly on carpet or in enclosed spaces that restrict airflow. Ensure the amplifier is not exposed to direct sunlight or excessive heat.
Wiring Connections
- Power Wire (+12V): Connect a heavy-gauge wire (e.g., 8-gauge or larger, depending on total power) directly from the positive terminal of your car battery to the +12V terminal on the amplifier. Install an in-line fuse holder with an appropriate fuse (matching the amplifier's fuse rating) within 18 inches of the battery.
- Ground Wire (GND): Connect a heavy-gauge wire of the same size as the power wire from the GND terminal on the amplifier to a clean, unpainted metal surface on the vehicle's chassis. Ensure a good electrical connection.
- Remote Turn-On Wire (REM): Connect a smaller gauge wire (e.g., 18-gauge) from the REM terminal on the amplifier to the remote output of your head unit. This wire turns the amplifier on and off with your stereo.
- RCA Audio Input: Connect RCA cables from your head unit's pre-amp outputs to the Low Level Input (RCA) jacks on the amplifier. If your head unit does not have RCA outputs, use the High Level Input.
- Speaker Output: Connect your speakers to the Speaker Output Terminals. Ensure correct polarity (+ to + and - to -). For bridged mode, consult the wiring diagram specific to your speaker configuration (typically connecting to one positive and one negative terminal across channels).
Operating Instructions
Once the amplifier is installed and wired correctly, follow these steps for initial setup and operation:
- Initial Gain Setting: Turn the Input Level Control (Gain) to its minimum setting.
- Crossover Setting: Set the Crossover Mode switch according to your speaker setup:
- FULL: For full-range speakers (no filtering).
- LP (Low Pass): For subwoofers. Adjust the Low Pass Control to the desired frequency (e.g., 80-120 Hz).
- HP (High Pass): For full-range speakers or component sets to filter out low bass. Adjust the High Pass Control to the desired frequency (e.g., 80-120 Hz).
- Bass Boost Setting: Start with the Bass Boost Control at its minimum setting.
- Power On: Reconnect the vehicle's battery. Turn on your car stereo. The amplifier's power indicator should illuminate.
- Adjusting Gain: Play a familiar piece of music at a moderate volume on your head unit. Slowly increase the Input Level Control on the amplifier until you hear distortion, then back it off slightly. This sets the gain to match your head unit's output without clipping.
- Fine-Tuning: Adjust the Crossover and Bass Boost controls to achieve your desired sound balance. Make small adjustments and listen carefully.
Maintenance
To ensure the longevity and optimal performance of your Pyramid PB918 amplifier, follow these simple maintenance guidelines:
- Keep Clean: Regularly wipe the amplifier's exterior with a soft, dry cloth to remove dust and debris. Avoid using harsh chemicals or abrasive cleaners.
- Ensure Ventilation: Periodically check that the amplifier's heatsink fins are clear of obstructions to allow for proper airflow and cooling.
- Check Connections: Occasionally inspect all wiring connections (power, ground, remote, RCA, speaker) to ensure they are secure and free from corrosion. Loose connections can lead to poor performance or damage.
- Fuse Replacement: If the amplifier's fuse blows, replace it only with a fuse of the exact same type and rating. Using an incorrect fuse can cause serious damage to the amplifier or vehicle's electrical system.
Troubleshooting
If you encounter issues with your amplifier, refer to the following common problems and solutions before contacting support:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power / Amplifier does not turn on | Blown fuse Loose power/ground/remote wire No remote signal | Check and replace fuse Verify all power, ground, and remote connections are secure Check remote wire connection at head unit |
| No Sound Output | Loose RCA/speaker connections Incorrect gain setting Crossover set incorrectly Head unit volume too low | Check all RCA and speaker wire connections Adjust Input Level Control Verify Crossover Mode and frequency settings Increase head unit volume |
| Distorted Sound | Gain set too high Poor ground connection Damaged speakers | Reduce Input Level Control Ensure a clean, secure ground connection Test speakers with another amplifier if possible |
| Amplifier Overheats (Protection light on) | Insufficient ventilation Speaker impedance too low Prolonged high volume operation | Ensure adequate airflow around amplifier Check speaker impedance (must be within amplifier's rated range) Reduce volume or allow amplifier to cool down |
Specifications
Below are the technical specifications for the Pyramid PB918 2-Channel Car Stereo Amplifier:
Image: Dimensions of the Pyramid PB918 amplifier.
- Model Number: PB918
- Number of Channels: 2
- Maximum Output Power: 2000 Watts
- Voltage: 12 Volts (DC)
- Minimum Supply Voltage: 12 Volts (DC)
- Item Dimensions (L x W x H): 9.06 x 10.25 x 2.26 inches
- Item Weight: 5.3 pounds
- Material: Heavy Duty Aluminum Alloy
- Mounting Type: Car Mount
- Specification Met: FCC
Warranty and Support
This Pyramid PB918 amplifier is covered by a Manufacturer Warranty. For specific details regarding warranty coverage, duration, and terms, please refer to the warranty card included with your product or contact Pyramid customer support directly.
For technical assistance, troubleshooting beyond this manual, or warranty claims, please visit the official Pyramid website or contact their customer service department. Keep your purchase receipt as proof of purchase for warranty purposes.
