Recoil DI550.4 - User Manual

DI550.4-DI600.1
mono power amplifier and 4 channel power amplifier
User Manual
MONO POWER AMPLIFIER
DI550.4-DI600.1

Summary

Front Panel Controls

Input Level and Signal Type

Adjusts input signal sensitivity and selects between pre-amp or speaker level input.

Crossover and Filter Settings

Manages high-pass filter, low-pass filter, and full-range crossover modes.

Bass Boost Features

Controls the frequency and level of the bass boost enhancement.

Rear Panel Connections

Grounding Terminal (GND)

Ensures proper grounding for safe and stable amplifier operation.

Remote Control Terminal (REM)

Connects to the source unit for automatic power on/off.

Power and Speaker Wiring

+12 V Battery Connection

Details on connecting the amplifier's positive power terminal to the car battery.

Speaker Connection Guidelines

Instructions for correctly connecting speaker cables to prevent amplifier damage.

Speaker Wiring Diagrams

4-Channel Amplifier Connections

Illustrates speaker connections for the 4-channel D1550.4 amplifier.

Bridged Mode Wiring

Diagrams showing speaker connections for bridged operation on the 4-channel amp.

Mono Amplifier Wiring

Monoblock Amplifier Connections

Illustrates speaker connections for the D1600.1 monoblock amplifier.

Impedance Configurations

Shows different speaker impedance configurations for the monoblock amp.

Troubleshooting Common Issues

No Functionality or Sound

Diagnoses issues related to no power, no sound, or protection mode activation.

Poor Sound Quality

Addresses distorted sound, weak bass, or phase issues.

Installation and Safety Precautions

Optimal Installation Environment

Guidelines on avoiding high temperatures, moisture, and dirt during installation.

Operational Safety Advice

Recommendations on battery voltage, volume levels, and handling desiccants.

Overview

1. Function Description
2. Usage Features
3. Maintenance Features

The Recoil D1550.4-D1600.1 is a series of power amplifiers designed to enhance your car audio system. This series includes both a mono power amplifier and a 4-channel power amplifier, offering versatility for different audio setups. The user manual provides comprehensive guidance for installation, wiring, and troubleshooting, ensuring optimal performance and longevity of the device.

Function Description

The primary function of these amplifiers is to boost the audio signal from your source unit, delivering more power to your speakers for a richer, louder, and clearer sound experience. The D1550.4 is a 4-channel amplifier, ideal for powering multiple speakers (e.g., front and rear speakers) in a stereo or multi-speaker setup. The D1600.1 is a mono power amplifier, specifically designed for driving subwoofers, providing dedicated power for low-frequency reproduction.

Both models feature a robust design with various controls on the front panel to fine-tune the audio output. These controls allow users to adjust input sensitivity, filter settings, and bass boost, tailoring the sound to their preferences and the characteristics of their speakers. The amplifiers support both high-level (speaker-level) and low-level (RCA) signal inputs, making them compatible with a wide range of source units, including those without dedicated RCA outputs. For source units lacking RCA outputs, a Soundmagus HTL series signal adaptor can be used.

The rear panel of the amplifiers provides terminals for power, ground, remote turn-on, and speaker connections. These connections are crucial for the amplifier's operation and integration into the vehicle's electrical and audio systems. Proper wiring, as detailed in the manual, is essential for safe and efficient performance.

Usage Features

The Recoil D1550.4-D1600.1 amplifiers offer several features to optimize your audio experience:

• Input Level Control: This control allows you to match the amplifier's input sensitivity to the output level of your source unit, preventing distortion and ensuring a clean signal. It supports both "PRE IN" (low-level RCA) and "SPK IN" (high-level speaker) inputs.
• HPF (High Pass Filter) Control: Available on the D1550.4 (4-channel amplifier), the HPF allows you to filter out low frequencies from the signal sent to your full-range speakers. This helps prevent distortion in smaller speakers and directs bass frequencies to a subwoofer if one is present. The HPF can be adjusted from OFF to 200Hz.
• LPF (Low Pass Filter) Control: Available on both models, the LPF filters out high frequencies, allowing only low frequencies to pass through. This is particularly useful for subwoofers, ensuring they only reproduce the bass notes. The LPF on the D1550.4 can be adjusted from 50Hz to 750Hz, while on the D1600.1, it ranges from 40Hz to 220Hz.
• X-OVER (Crossover) Switch: On the D1550.4, this switch allows you to select between FULL, HPF, or LPF modes for each group of channels (Group A and Group B), providing flexibility in configuring your speaker setup.
• Subsonic Filter: Present on the D1600.1 (mono amplifier), the subsonic filter removes extremely low frequencies that are below the audible range or beyond the subwoofer's capabilities. This protects the subwoofer from damage and improves overall sound quality by preventing wasted power on inaudible frequencies. It can be adjusted from 10Hz to 50Hz.
• Bass Boost Control: Both amplifiers feature a bass boost function, allowing you to enhance the low-frequency output. The D1550.4 offers a range from 0dB to 12dB, while the D1600.1 provides 0dB, 6dB, and 12dB options, along with a frequency control (50Hz) to select the center frequency of the boost.
• Remote Turn-On: The "REM" terminal connects to your source unit's remote output, allowing the amplifier to automatically turn on and off with your car's audio system, simplifying operation.
• Speaker Connections: The D1550.4 supports 4-ohm bridged speaker configurations, while the D1600.1 supports a minimum of 2-ohm speaker loads. Correct speaker wiring (plus to plus, minus to minus) is critical to prevent damage to the amplifier and ensure proper sound reproduction. Never connect speaker cables directly to the chassis ground.
• Protection Circuitry: Both amplifiers are equipped with protection circuits designed to safeguard the transistors and speakers from malfunctions, such as short circuits, overheating, or improper loads. This enhances the durability and reliability of the device.

Maintenance Features

Proper installation and adherence to the guidelines in the user manual are key to the long-term performance and maintenance of your Recoil amplifier.

• Power Connection: The amplifier requires a direct connection to the positive terminal of a 12V car battery. A special cable with adequate gauge should be used, and a fuse must be installed in series within 20 centimeters of the battery's positive pole to protect against overcurrent.
• Ground Connection: A robust grounding cable must be firmly connected to the vehicle's frame or another point with good conductivity. The grounding point should be clean and free of oxidation to ensure a reliable connection. The grounding cable should have the same specifications as the power supply cable.
• Installation Environment: To prevent overheating and damage, avoid installing the unit in locations exposed to direct sunlight, hot air from heaters, rain, moisture, or excessive dust. When installing horizontally, ensure that the heatsink fins are not covered by carpet or other materials, as this can impede heat dissipation. If the unit is placed too close to the car radio, interference may occur; in such cases, separate the amplifier from the radio.
• Battery Condition: The amplifier's optimal performance depends on a normal battery supply voltage. Using the unit with a weak auto battery may compromise its output and efficiency.
• Troubleshooting: The manual provides a troubleshooting guide for common issues such as no function, no sound, or poor sound quality. This includes checking cable connections, fuses, speaker wiring for short circuits, and gain control settings. If the protection LED illuminates, it indicates an issue that needs to be addressed, such as an overloaded speaker setup or a short circuit.
• Safety Precautions: For safety, it is recommended to keep the car audio system's volume at a moderate level to ensure you can still hear external traffic sounds. If the product contains desiccant, do not ingest it, avoid contact with liquids, and keep it away from children.

By following these guidelines, users can ensure their Recoil D1550.4-D1600.1 amplifiers provide a high-quality audio experience for years to come.

Recoil DI550.4 Specifications

General

Channels	4
THD at Rated RMS Power	<0.05%
Signal to Noise Ratio	>95dB
Input Sensitivity	200mV - 6V
Bass Boost	0-12dB
Bass Boost Frequency	45Hz
Crossover Type	Variable