Pyramid 903G

Pyramid 903G 10 Band Half-DIN Graphic Equalizer Amplifier User Manual

Model: 903G

1. Introduction

Thank you for choosing the Pyramid 903G 10 Band Half-DIN Graphic Equalizer Amplifier. This unit is designed to enhance your car audio system by providing precise sound control and amplification. Please read this manual thoroughly before installation and operation to ensure proper use and optimal performance.

2. Important Safety Information

  • Professional Installation Recommended: Due to the complexity of car audio wiring, professional installation is highly recommended. Incorrect wiring can damage the unit or your vehicle's electrical system.
  • Power Source: This unit is designed for 12V DC negative ground systems only. Do not attempt to use it with other voltage systems.
  • Ventilation: Ensure adequate ventilation around the unit. The unit can generate heat during operation. Avoid installing in enclosed spaces without airflow.
  • Wiring: Always disconnect the vehicle's battery before performing any wiring. Use appropriate gauge wires for power and speaker connections.
  • Moisture: Do not expose the unit to moisture or water.
  • Fuse Protection: Ensure proper fuse protection is in place for the power supply.

3. Product Overview

3.1 Features

  • Half-DIN Design (1-Inch Tall)
  • 10 Band Graphic Equalizer with 12dB Boost/Cut per band
  • Power On/Off Switch
  • Dual Channel Multi-Colored Power Level Indicators
  • 100 Watts x 2 Maximum Output
  • 2/4 Speaker Hook-up Capability
  • Fader Control
  • Common or Floating Ground
  • Automatic Overload Sensing Circuit

3.2 Package Contents

Please check that all items are present:

  • Pyramid 903G Equalizer Amplifier Unit
  • Mounting Hardware (screws, brackets)
  • Wiring Harness (if included)
  • User Manual (this document)

3.3 Front Panel Controls

Pyramid 903G Front Panel

Figure 1: Front view of the Pyramid 903G Graphic Equalizer Amplifier. This image shows the 10 equalizer bands, power switch, fader control, and multi-colored power level indicators.

  1. Equalizer Bands (1-10): Sliders for adjusting specific frequency ranges.
  2. Power ON/OFF Switch: Toggles the unit's power.
  3. Fader Control: Adjusts the balance between front and rear speakers.
  4. Power Level Indicators: Multi-colored LEDs indicating output power levels.

4. Installation and Wiring

Before beginning installation, ensure the vehicle's battery is disconnected to prevent electrical shorts. This unit is designed for 12V DC negative ground systems.

4.1 Mounting

  • The 903G features a Half-DIN design, allowing for flexible installation in various vehicle dashboards or consoles.
  • Choose a location that provides adequate ventilation to dissipate heat, as the unit can become warm during operation.
  • Secure the unit using the provided mounting hardware.

4.2 Wiring Connections

Refer to the wiring diagram (if provided with your unit) for specific connections. The following describes general wiring principles:

  • Power (RED wire): Connect to a switched 12V DC power source (e.g., ignition wire) that turns on and off with the vehicle's ignition. Ensure this connection is fused.
  • Ground (BLACK wire): Connect securely to a clean, unpainted metal chassis point in the vehicle. A poor ground connection can lead to noise (ground loops).
  • Remote Turn-On (BLUE wire - if present): Connect to the remote output of your head unit. This will turn the equalizer on and off with your head unit.
  • Audio Input: Connect the speaker outputs from your head unit to the corresponding input terminals on the 903G. The unit supports 2 or 4 speaker hook-up.
  • Speaker Output: Connect your vehicle's speakers to the output terminals of the 903G. Ensure correct polarity (+ to + and - to -). The unit supports 4-8 Ohm output impedance.

Note: The unit's wiring may be angled downwards, which can reduce effective wire length. Plan your wire routing accordingly.

5. Operation

Once installed and wired correctly, follow these steps to operate your Pyramid 903G:

  1. Power On: Turn on your vehicle's ignition and your head unit. If wired correctly, the 903G should power on automatically or by using its Power ON/OFF switch. The multi-colored power level indicators will illuminate.
  2. Initial Sound Check: Start with all equalizer bands set to the center (flat) position. Play a familiar audio track.
  3. Adjust Fader Control: Use the Fader control to balance the sound between your front and rear speakers to your preference.
  4. Equalization: Adjust the 10 equalizer band sliders to fine-tune the audio frequencies. Each band allows for up to 12dB of boost or cut.
    • Lower frequencies (leftmost sliders) control bass.
    • Mid-range frequencies (middle sliders) control vocals and instruments.
    • Higher frequencies (rightmost sliders) control treble and clarity.
    Adjust gradually and listen for improvements in sound quality. Avoid extreme settings that can introduce distortion.
  5. Monitor Power Level Indicators: The multi-colored LEDs provide a visual indication of the amplifier's output. Avoid consistently high levels that may indicate clipping or distortion.

6. Maintenance

  • Cleaning: Use a soft, dry cloth to clean the unit's exterior. Do not use harsh chemicals or abrasive cleaners.
  • Ventilation: Periodically check that the ventilation areas are not obstructed by dust or debris.
  • Connections: Ensure all wiring connections remain secure. Loose connections can lead to intermittent sound or noise.

7. Troubleshooting

ProblemPossible CauseSolution
No power / Unit does not turn on
  • Blown fuse
  • Incorrect power wiring
  • Loose ground connection
  • Check and replace fuse if necessary.
  • Verify 12V DC power and remote turn-on connections.
  • Ensure ground wire is securely connected to a clean metal surface.
No sound output
  • Incorrect input/output wiring
  • Fader control set incorrectly
  • Head unit volume too low
  • Check all audio input and speaker output connections.
  • Adjust the Fader control.
  • Increase volume on your head unit.
Engine noise (whine, hiss)
  • Poor ground connection (ground loop)
  • Power wires too close to audio cables
  • Alternator noise
  • Ensure a solid, clean ground connection. Try a different ground point.
  • Route power and audio cables separately.
  • Consider installing a noise filter on the power line (e.g., Metra 20amp noise filter).
Unit gets excessively hot
  • Inadequate ventilation
  • Overload condition
  • Ensure sufficient space around the unit for airflow.
  • Check speaker impedance (must be 4-8 Ohm). Reduce volume if consistently overheating.

8. Specifications

Model Number903G
DesignHalf-DIN (1-Inch Tall)
Equalizer Bands10 Bands
Boost/Cut Range+/- 12dB per band
Maximum Output Power100 Watts x 2
Speaker Hook-up2/4 Speaker
Frequency Response30Hz - 30kHz
Output Impedance4-8 Ohm
Power System12V DC Negative Ground
Dimensions (L x W x H)5-Inch x 7-Inch x 1-Inch (Product)
Weight1.7 pounds (Product)

9. Warranty Information

The Pyramid 903G comes with a 1-YEAR limited warranty from the date of purchase. This warranty covers manufacturing defects in materials and workmanship under normal use. It does not cover damage resulting from improper installation, accident, misuse, abuse, neglect, unauthorized modification, or normal wear and tear. Please retain your proof of purchase for warranty claims.

10. Customer Support

For technical assistance, troubleshooting, or warranty inquiries, please contact Pyramid customer support. Refer to the official Pyramid website or your purchase documentation for the most current contact information.

Note: When contacting support, please have your product model number (903G) and proof of purchase readily available.

© 2023 Pyramid. All rights reserved. Specifications are subject to change without notice.