Infinity INFDSP4425 4x25 31-Band DSP with Sub Output

Introduction

The Infinity INFDSP4425 is a versatile 4-channel digital signal processor (DSP) with an integrated amplifier, designed to enhance your vehicle's audio system. It provides four finely-tuned and powered outputs, along with a dedicated subwoofer output. This unit accepts both RCA and speaker-level inputs, allowing for integration into various audio setups, including factory systems. The balanced differential inputs ensure optimal sound quality and noise rejection. This manual provides essential information for the proper installation, operation, and maintenance of your INFDSP4425.

Safety Information

Please read all instructions carefully before installing or operating the INFDSP4425. Failure to follow these guidelines may result in injury, damage to the unit, or damage to your vehicle.

• Always disconnect the vehicle's negative battery terminal before beginning any electrical work.
• Ensure proper grounding for all components to prevent electrical hazards.
• Use appropriate wire gauges for power and speaker connections as specified in the installation guide.
• Mount the unit securely in a location that does not obstruct vehicle operation or safety features.
• Avoid mounting the unit in areas exposed to excessive heat, moisture, or direct sunlight.
• Consult a qualified professional if you are unsure about any installation steps.
• This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

What's in the Box

Verify that all components are present before proceeding with installation:

• 1x Infinity INFDSP4425 Digital Signal Processor/Amplifier
• Wiring Harnesses (Power/Speaker Input, RCA Output)
• Mounting Hardware
• User Manual (this document)

Setup

Physical Installation

Choose a mounting location that is dry, well-ventilated, and secure. Ensure there is sufficient space for wiring connections and heat dissipation. The unit can be mounted in various positions, such as under a seat, in the trunk, or behind a dashboard panel. Use the provided mounting hardware to secure the unit firmly to a solid surface.

Figure 1: Angled view of the Infinity INFDSP4425, illustrating its compact design and integrated mounting tabs for secure installation.

Wiring Connections

The INFDSP4425 features clearly labeled wire connections for straightforward installation.

• Power (PWR): Connect the main power wire to the vehicle's positive battery terminal, ensuring an inline fuse is installed close to the battery.
• Ground (GND): Connect the ground wire to a clean, unpainted metal surface on the vehicle chassis.
• Remote (REM): Connect the remote turn-on wire to your head unit's remote output. Alternatively, the unit supports DC offset or audio signal sensing for automatic turn-on.
• Input: The DSP accepts both RCA (low-level) and speaker-level (high-level) inputs. Connect your audio source to the appropriate input terminals.
• Output: Connect the speaker outputs to your vehicle's speakers and the subwoofer pre-out to an external subwoofer amplifier.

Figure 2: The Infinity INFDSP4425 with its various wiring harnesses connected, including RCA outputs (white and red connectors) and the multi-colored speaker-level input harness. This view highlights the comprehensive connectivity options.

Figure 3: A detailed view of the INFDSP4425's control panel, showing the remote port, turn-on mode switch (REM, DC, AUDIO), input level switch (LOW, HI), PC connection port, and the output/input wiring terminals.

Operating Instructions

The primary operation of the INFDSP4425 involves using the DSP software to customize your audio settings.

• DSP Software: Launch the DSP software on your connected computer. The interface provides controls for:
  • Equalization: Adjust the 31-band equalizer for each channel to fine-tune the frequency response.
  • Crossovers: Set high-pass, low-pass, and band-pass filters for each speaker to direct appropriate frequencies.
  • Time Alignment: Adjust the delay for each speaker to ensure sound arrives at the listening position simultaneously.
  • Gain Control: Independently adjust the output level for each channel.
  • Phase Control: Adjust the phase of individual channels to correct acoustic issues.
• Input Level Switch: Set the "INPUT LEVEL" switch on the unit to "LOW" for RCA inputs or "HI" for speaker-level inputs.
• Turn-On Mode: Select the desired turn-on mode using the "TURN-ON MODE" switch:
  • REM: Uses a traditional remote turn-on wire from the head unit.
  • DC: Detects a DC offset on the speaker-level inputs to turn on.
  • AUDIO: Detects an audio signal on the speaker-level inputs to turn on.

Maintenance

The Infinity INFDSP4425 requires minimal maintenance.

• Cleaning: Periodically wipe the unit with a soft, dry cloth to remove dust. Do not use harsh chemicals or abrasive cleaners.
• Ventilation: Ensure that the mounting location allows for adequate airflow around the unit to prevent overheating.
• Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion.

Troubleshooting

If you experience issues with your INFDSP4425, refer to the following common problems and solutions:

Specifications

Warranty Information

The Infinity INFDSP4425 comes with a limited warranty. For specific terms, conditions, and duration of the warranty, please refer to the warranty card included with your product or visit the official Infinity website. Keep your proof of purchase for warranty claims.

Support

For technical assistance, software downloads, or further inquiries regarding your Infinity INFDSP4425, please visit the official Harman website or contact Infinity customer support.

• Official Website: www.harman.com (Harman is the parent company of Infinity)
• Customer Service: Refer to the contact information provided on the official website for your region.