Directed 600d Amp Manual

The Directed 600d is a high-performance car amplifier delivering 600 watts RMS power, featuring Class D technology for efficient operation, built-in crossover networks, variable bass boost, thermal/overload/short circuit protection, and low-level RCA inputs. Designed for automotive audio systems with 12V DC operation. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Operation Guidelines 8. Protection Features 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Class D amplifier circuit, Remote Bass Control, Power/Protection LEDs, Speaker Output Terminals, RCA Inputs, Gain Control.

Feature	Description
Power Output	600 Watts RMS at 2 Ohms
Class D Technology	High-efficiency amplifier design
Crossover Network	Low-pass and high-pass filters
Bass Boost	Variable bass enhancement (0-18dB)
Remote Bass Control	Optional remote for bass adjustment
Protection Circuits	Thermal, overload, and short circuit protection
RCA Inputs	Low-level audio inputs
Speaker Outputs	2-channel or bridged mono output
Power LED	Indicates amplifier status
Protection LED	Indicates fault conditions

Installation

Unpack and inspect contents. Choose suitable mounting location in vehicle.

Disconnect vehicle battery negative terminal before installation.
Mount amplifier: Secure to solid surface using provided hardware.
Connect power: Run 4-gauge power cable from battery to amplifier.
Connect ground: Use short ground cable to vehicle chassis.
Connect remote turn-on: Connect to head unit remote wire.
Connect audio inputs: Use RCA cables from head unit to amplifier.
Connect speakers: Use appropriate gauge speaker wire.

WARNING! Ensure proper fuse rating (60A recommended) near battery connection. Route cables away from moving parts and heat sources.

First-Time Setup

Reconnect battery; power on system; configure settings.

Set gain control: Start at minimum, adjust while playing music at 3/4 volume.
Set crossover: Choose low-pass for subwoofers or high-pass for full-range speakers.
Set bass boost: Start at minimum, adjust to preference.
Test operation: Verify all channels working properly.

CAUTION! Do not set gain too high to avoid distortion and speaker damage.

Specifications

Power Output: 600W RMS @ 2Ω, 300W RMS @ 4Ω
Frequency Response: 20Hz - 250Hz (±1dB)
Signal-to-Noise Ratio: >85dB
Crossover Frequency: 50Hz - 250Hz adjustable
Bass Boost: 0-18dB @ 45Hz
Input Sensitivity: 200mV - 6V
Operating Voltage: 12V DC (10V - 16V)
Fuse Rating: 60A external required
Dimensions: 12.5" x 9.5" x 2.25"

Controls and Settings

Access controls on amplifier end panel. Front Panel: Power LED (blue), Protection LED (red).

Controls: Gain Control, Low-Pass Crossover, Bass Boost, Remote Bass Connection.

Gain: Adjusts input sensitivity (start low, increase gradually). Crossover: Sets frequency cutoff (50-250Hz). Bass Boost: Increases bass at 45Hz (use sparingly). Phase: 0° or 180° for speaker alignment.

Connecting Devices

Power: 4-gauge power cable to battery. Ground: 4-gauge to chassis. Audio: RCA inputs from head unit. Speakers: 2-channel or bridged mono.

Disconnect battery before making connections.
Use proper gauge wire for all connections.
Secure all connections tightly.
Route RCA cables away from power wires.

Tip: Use distribution blocks for multiple amplifiers.

Operation Guidelines

Optimize performance with proper settings.

Power sequence: Turn on head unit first, then amplifier.
Volume control: Set head unit to 3/4 maximum volume when setting gain.
Crossover settings: Use low-pass for subwoofers (80Hz recommended).
Bass boost: Use moderately to avoid distortion.
Cooling: Ensure adequate ventilation around amplifier.

WARNING! Do not operate with impedance below specified minimum. Avoid clipping distortion.

Protection Features

Thermal Protection: Automatically shuts down if temperature exceeds safe limits. Overload Protection: Protects against excessive current draw. Short Circuit Protection: Prevents damage from speaker wire shorts. DC Offset Protection: Guards against DC voltage at outputs.

Care & Maintenance

Keep amplifier clean and dry. Check connections periodically for tightness. Ensure proper ventilation around amplifier.

CAUTION! Do not use liquids for cleaning. Disconnect power before servicing.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for automotive use. Copyright © Directed Electronics; all rights reserved. For technical support, visit www.directed.com or contact 1-800-876-0800.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power/ground connections	Check battery connection; verify ground; check fuse.
Protection mode	Short circuit/overheating	Check speaker wires for shorts; allow amplifier to cool.
No sound	Input/RCA connections	Verify RCA cables connected; check head unit settings.
Distorted sound	Gain too high/clipping	Reduce gain setting; check head unit volume.
Overheating	Insufficient ventilation	Improve airflow; check impedance load.

Reset: Disconnect power for 2 minutes to reset protection circuits.

Service: 1-800-876-0800; www.directed.com