Yamaha AD8HR User Manual

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Thank you for choosing the Yamaha AD8HR AD converter with remote microphone
preamp.
The AD8HR is an eight-channel AD converter equipped with remote microphone
preamps that feature 96kHz, 24-bit linear AD conversion, 128-times oversampling,
and a dynamic range of 110dB. Its input section features balanced XLR connectors,
high-quality mic preamps, +48V phantom power, and support for both mic and line-
level inputs. The output section supports the AES/EBU format and features a high
sampling frequency of 88.2/96kHz. You can easily adjust the gain for each channel
(in 1dB steps) and set up the high pass filter from the front panel. These settings are
stored in the unit’s backup memory, and are retained even after the power is turned
off. In addition, a special protocol enables you to remotely control the unit from a
connected computer or other device.
Please read this manual thoroughly before using the unit to take the greatest
advantage of the AD8HR’s extensive features for the longest period of time. After you
read this manual, please keep it in a safe place.
Owner’s Manual

Yamaha AD8HR Specifications

General

Input voltage	220 - 240 V
Input frequency	50 - 60 Hz
Operating voltage	100 V
Power consumption (typical)	35 W
Accuracy	1 dB
Product color	Black
Frequency range	20000 - 40000 Hz
Maximum input level	-128 dBu
Nominal input level	-80 dBu
Audio (L/R) out	-

Weight and Dimensions

Depth	383.5 mm
Width	480 mm
Height	45 mm
Weight	5000 g

Summary

Safety Precautions

General Warnings

Covers electrical shock, short-circuiting, damages, fire, and other hazards.

Water Warning

Advises against exposing the device to rain or damp conditions.

Abnormality Handling

Instructs on actions for frayed cords, loss of sound, smoke, or damage.

Power Supply and Cord Precautions

Details correct voltage usage and power cord handling.

Device Handling and Placement

Covers safe operation, opening the device, placement, and avoiding noise.

Connection and Operation Precautions

Details grounding, cable connections, and volume level settings.

Important Safety Instructions

General Safety Guidelines

Covers reading instructions, water usage, ventilation, heat, and plug safety.

Front Panel Controls and Indicators

Gain Display and Control

Master Switches

Rear Panel Connectors and Switches

Grounding Screw

[AC IN] Connector

[HA REMOTE] Connectors

[PC RS422] Switch

[DIGITAL OUT A/B] Connectors

Outputs AES/EBU format digital audio data.

[WORD CLOCK] Connectors

INPUT 1-8 Connectors

Basic Operations

Selecting the Wordclock Source

Guides users on how to choose the wordclock source.

Setting Phantom Power

Explains how to enable or disable +48V phantom power per channel.

Adjusting Channel Gain

Details how to adjust the gain for individual channels in 1dB steps.

Adjusting Gain Trim (Correction)

Basic Operations (Continued)

Setting the High Pass Filter (HPF)

Explains how to set the HPF on/off and adjust its cut-off frequency.

Copying Channel Settings

Selecting AES/EBU Format Modes

Guides on choosing between Double Speed (AE1) and Double Channel (AE2) modes.

Advanced Operations

Panel Operation Lock Function

Initializing Memory

Remote Control Configuration

Setup and usage of remote control features for the unit.

Connection Examples

AES/EBU Connections

Diagrams and instructions for connecting via AES/EBU.

AD8HR Daisy Chain Connection

Illustrates how to connect multiple AD8HR units in a daisy chain.

Wordclock Synchronization

AES/EBU Connections for Wordclock

WORD CLOCK Jack Connection

Details on connecting wordclock signals via BNC connectors.

Electrical Characteristics

Frequency Response

Total Harmonic Distortion

Hum & Noise

Dynamic Range

Appendix (Continued)

Error Messages

Explanation of error codes (E1, E2, E3) and troubleshooting advice.

DIGITAL OUT A/B Pin Assignment Table