Table of Contents
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INTRODUCTION
The Diamond Audio D3 Series Amplifiers incorporate the following features:
Full frequency response with low distortion and exceptional signal to noise performance.
Advanced circuit design that features stereo, mono and mixed mode operation for use in a
variety of systems.
Variable high-pass/low-pass electronic crossover with a 12 dB per octave slope and fully
adjustable range (55 Hz~550 Hz).
Variable bass boost circuit to reinforce low frequency signals.
Adjustable input level controls with ground loop isolation accepting a wide range of input
signals.
Remote turn-on with "soft start" muting to prevent turn on "thump" .
Pulse-width modulated (PWM) MOSFET power supply with low AM RFI and protection
circuits for overheating and speaker shorts.
Nickel-plated input/output connectors and an external automotive type fuse.
Aluminum heat sink for efficient heat dissipation.
Low profile, compact size for space limited installs
TABLE OF CONTENTS
DESCRIPTION
The D3 Series Amplifiers provide a wide range of power and features that make them an
excellent choice for a variety of car audio sound system configurations.
D3 Amplifiers use an unregulated power supply for good control of output power. This
power supply design helps yield maximum power transfer with a minimum of heat loss.
On board noise filtration is used to keep unwanted noise from leaking into the system from the
amplifier. Each D3 amplifier comes complete with thermal, short, and load protection circuits
as well.
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Summary of Contents for Diamond D3 Series
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Page 1: Table Of Contents
System Diagrams DESCRIPTION The D3 Series Amplifiers provide a wide range of power and features that make them an excellent choice for a variety of car audio sound system configurations. D3 Amplifiers use an unregulated power supply for good control of output power. This power supply design helps yield maximum power transfer with a minimum of heat loss. -
Page 2: Specifications
All connections and controls for the D3 Amplifiers are located on the end panels. Plated connections ensure excellent conductivity and good looks. Easy to understand controls make setting the amplifier up correctly an easy task. SPECIFICATIONS 4 Ohm Stereo Output 2 Ohm Stereo Output 4 Ohm Mono Output Frequency Response... -
Page 3: Input Connections And Audio Control
INPUT CONNECTIONS AND AUDIO CONTROL The following figures show the input/audio control end panels for each amplifier along with a key to show the layout. Fig.3 D3 400.2 1.RCA lnput jacks 2.Gain Control 3.Bass Boost Control 4.Crossover Frequency Fig.4 D3 400.4 1.Front RCA lnput jacks 2.Rear RCA lnput jacks 3.Front Gain Control... -
Page 4: Setting The Gain
SETTING THE GAIN The best way to set the gains on any amplifier is with an oscilloscope and test tone. Using the scope will ensure the amplifier is not clipping and protect your system from being damaged from being overdriven. If you have an oscilloscope and need help using it, feel free to call DAT Technical Support for help. -
Page 5: System Diagrams
Problem Distorted audio. Solution Check that gains are set correctly. Inspect speakers for damaged cones or bad voice coils. Problem Amplifier fuse keeps blowing. Solution: Check all power and signal wires for a short. Make sure power and ground wires are correctly connected to the amp. - Page 6 2-Channel Full-Range, Satellite, of Subwoofer Stereo System D3 400.2 Fig.6 In this application, the amplifier is used in stereo and drives two full-range (or satellite or subwoofer) speakers. NOTE A passive crossover must be used with satellite speakers. Set X-Over Mode to FULL Low HIGH FULL Set X-Over Mode to FULL ADJUST FREQ to speaker...
- Page 7 Mixed-Mode Satellite and Subwoofer System D3 400.2 Low HIGH FULL Set X-Over Mode to FULL. NOTE Chart values based on 4 ohm speakers. Fig.7 The amplifier can be configured for a mixed-mode operation. The table provides component values to create a 6dB per octave crossover at specified frequencies. Use components that have a 5% tolerance and capacitors rated at 100V.
- Page 8 D3 400.2 Fig.8 Electrical connections for the D3 400.2...
- Page 9 SOURCE 2CH BASS 2CH 4CH LOW HIGH FULL LOW HIGH FULL D3 400.4 Fig.9 ln this application, the D3 400.4 was used as a 4-channel amplifier to drive four full-range speakers in stereo.
- Page 10 4-Channel Stereo System 2-Channel High-Pass. 2-Channel Low-Pass SOURCE 2CH BASS 2CH 4CH D3 400.4 LOW HIGH FULL LOW HIGH FULL Fig.10 ln this 4-channel system, the D3 400.4 drives a pair of statellites and a pair of subwoofers. Note the filter settings.
- Page 11 2-Channel Stereo System with Low-pass Bridged Mono Channel SOURCE 2CH BASS 2CH 4CH LOW HIGH FULL LOW HIGH FULL D3 400.4 Fig.11 The D3 400.4 can alse be used to drive a pair of stereo satellites and a single mono subwoofer.
- Page 12 2-Channel High Power Systems (Satellite or Subwoofer) D3 400.4 Fig.12 The D3 400.4 can also be set up as a 2-channel high-power amplifier to drive a pair of satellites (or subwoofers). SOURCE 2CH BASS 2CH 4CH LOW HIGH FULL SOURCE 2CH BASS 2CH 4CH LOW HIGH FULL LOW HIGH FULL...
- Page 13 Mixed-Mode System On Rear Full-Range Speakers On Front SOURCE 2CH BASS 2CH 4CH D3 400.4 LOW HIGH FULL LOW HIGH FULL NOTE Chart values based on 4 ohm speakers. Fig.13 The amplifier can be configured for a mixed-mode operation on either channels 1/2 or 3/4 amplifier sections.
- Page 14 D3 400.4 Fig.14 Electrcal connections for the D3 400.4...
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Page 15: Limited Warranty Statement
2003 Diamond Audio Technology. All rights reserved. LIMITED WARRANTY STATEMENT Diamond Audio Technology, Inc. (DAT) warrants all DAT products to be free of defects in material and workmanship for a period of one (1) year from the date of original purchase provided they are purchased from an authorized DAT retailer in the United States. - Page 16 D I A M O N D A U D I O T E C H N O L O G Y 400.2 & 400.4 Owner's Guide Date of Purchase Serial Number www.diamondaudio.com...