CIAudio D-500 MKII - User Manual

D•500 MKII Class D Monoblock Amplifier
Thank you for purchasing the D•500 MKII Power Amplifiers. These products are proudly
designed, assembled, and tested in the USA. We hope they will provide you with many years of
musical enjoyment.
Please read the entire contents of this manual before making connections to your audio
system.
Design
The D•500 represents the latest in Class D audio amplifier technology.
At the AC Input, we use our smooth-start circuit, which eases the start-up tasks, then to our
XDC•2 circuit to eliminate any DC voltage riding on your AC line. Power is then fed to our
custom multiple-output 922VA power transformer, then rectified by discrete Schottky diode
bridges. Several individual voltages are then filtered and regulated to provide power to various
circuits. The output circuit is unregulated with over 40,000uF of capacitance.
The amplification circuit is a custom full-bridge UcD design with power output of
500 watts into 8 ohms / 800 watts into 4 ohms. This design is 90% efficient at full power and
produces little heat (wasted energy). The small amount of heat generated by the amplifier is
dissipated by the machined aluminum chassis acting as a heat-sink.
This low operating temperature means the internal components aren't subject to the heat
cycles of traditional amplifiers, yielding better reliability, more consistent performance, and
longer life.

Summary

Design

Specifications

Connecting your D•500 s

Signal Input

Connect signal to amplifier inputs, using the toggle switch for RCA or XLR connections.

Speaker Output

Connect speaker '+' to amplifier '+' and speaker '-' to amplifier '-' using binding posts.

Sub-Woofer Connection

Connect D•500 '+' to subwoofer '+' input and D•500 chassis to subwoofer '-' input for powered subwoofers.

12 v Trigger

AC Power

Front Panel Switch;Indicator

Maintenance

Fuses

D•500 MKII Fuse Ratings

Specifies fuse ratings: 6.3A/250V for 100V-120V and 4.0A/250V for 220V-240V AC input.

Warranty

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

The D•500 MKII is a Class D Monoblock Amplifier designed, assembled, and tested in the USA, intended to provide musical enjoyment for many years. It represents the latest in Class D audio amplifier technology, focusing on efficiency, reliability, and consistent performance.

Function Description:

The D•500 MKII is a power amplifier designed to drive loudspeakers. It incorporates a smooth-start circuit at the AC input to ease start-up tasks and an XDC•2 circuit to eliminate DC voltage on the AC line. Power is supplied by a custom multiple-output 922VA power transformer, rectified by discrete Schottky diode bridges. Individual voltages are filtered and regulated for various circuits, while the output circuit remains unregulated with over 40,000uF of capacitance. The amplification circuit is a custom full-bridge UcD design.

Important Technical Specifications:

• Power Output: 500 watts into 8 ohms / 800 watts into 4 ohms.
• Bandwidth: 50kHz.
• Frequency Response: 10Hz - 20kHz, +0dB/-0.5dB.
• Damping Factor: >1000.
• Input Impedance: 100k ohms.
• Gain: 38dB (for use with VPC, PLC, or other passive preamplifiers) or 32dB (for use with active preamplifiers).
• Dimensions: 8.5" (width) x 4.0" (height) x 13.5" (depth).
• Weight: 28 lbs (each).
• Efficiency: 90% at full power, resulting in low heat generation.

Usage Features:

• Signal Input: The amplifier supports both RCA and XLR signal inputs. A toggle switch allows selection between RCA (up position) and XLR (down position).
• Speaker Output: Speakers are connected to binding posts. The red "+" binding post connects to the loudspeaker's "+" terminal, and the black "-" binding post connects to the loudspeaker's "-" terminal.
• Sub-Woofer Connection: The D•500 MKII uses a bridged output circuit, meaning both output terminals are "live" and should never be connected to ground. For powered sub-woofer systems that use speaker cables for signal, connect the amplifier's "+" terminal to the sub-woofer's "+" input. A wire should then be connected from the chassis of the D•500 to the sub-woofer's "-" input.
• 12V Trigger: A 12-volt DC trigger feature allows for remote mute/play functionality. Two ports are provided for daisy-chaining multiple amplifiers. This feature requires a compatible device like the PLC•1.
• AC Power Connection: Before connecting AC power, the amplifier should be in "mute" mode. A "click" will be heard as the SmoothStart circuit engages upon power connection.
• Front Panel Switch/Indicator: The front panel switch alternates between "play" and "mute" modes.
  • In the "out" position, the amplifier is in "mute" (input stage powered, output stage off).
  • In the "in" position, the amplifier is in "play" mode, and a blue LED ring illuminates.
  • If using the 12V trigger, the amplifier should be left in "mute," and the remote trigger will control the mute/play state. The blue LED ring will illuminate when turned on by the 12V trigger.

Maintenance Features:

• Cleaning: The D•500 MKII is largely maintenance-free, apart from occasional cleaning. Always disconnect the amplifier from power before cleaning. The exterior can be cleaned with a soft cloth moistened with window cleaner. Avoid applying liquids directly to the aluminum surface.
• Fuses: Standard AC line fuses protect the amplifier and are located in the AC input block above the power cord inlet. Each fuse holder includes a spare fuse. Always disconnect from AC power before checking or changing fuses.
  • Fuse Ratings:
    • 6.3A/250V Fast Acting GBD Series (5mm x 20mm) for AC Input 100V~120V.
    • 4.0A/250V Fast Acting GBD Series (5mm x 20mm) for AC Input 220V~240V.

The low operating temperature, a benefit of its 90% efficiency, means internal components are not subjected to the heat cycles common in traditional amplifiers, contributing to better reliability, more consistent performance, and a longer lifespan. The machined aluminum chassis acts as a heat-sink to dissipate the minimal heat generated.

CIAudio D-500 MKII Specifications

General

Brand	CIAudio
Model	D-500 MKII
Category	Amplifier
Language	English