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API A2D User Manual

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T h e A P I
D U A L 3 1 2 M I C P R E A M P S
W I T H D I G I T A L O U T P U T
A P I , 8 3 0 1 P a t u x e n t R a n g e R o a d , J e s s u p , M D 2 0 7 9 4 T e l : 3 0 1 - 7 7 6 - 7 8 7 9
w w w . a p i a u d i o . c o m
A D
2
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API A2D Specifications

General IconGeneral
Input Channels2
A/D Conversion24-bit
Resolution24-bit
TypeAnalog to Digital Converter
Microphone Preamps2
Sample Rates44.1kHz, 48kHz, 88.2kHz, 96kHz
Analog Inputs2 x XLR/TRS Combo
Digital OutputsAES/EBU, S/PDIF
THD+N<0.002%
Power SupplyExternal Power Supply

Summary

API A2D Mic Preamp Overview

Analog Section Characteristics

Details the analog circuitry, level control, metering, and switches of the A2D.

Digital Section Characteristics

Describes the digital A/D conversion, sample rate choices, and clock options.

Analog Rear Panel Connections

Explains XLR inputs/outputs and 1/4 inch TRS insert connections.

Digital Rear Panel Connections

Covers SPDIF, AES digital outputs, and BNC reference clock input.

Clock Synchronization Requirements

Clarifies clock reference usage and sync indicator behavior.

Multi-Unit Linking

Details the D-sub connectors for chaining multiple A2D units.

Analog Mic/Line Input Section Details

Input Metering Functionality

Describes the input meter range and peak reading capability.

Analog Input Controls and Functions

Explains GAIN, POL, 48V, PAD, 2:1 transformer, and MIC/LINE selection.

Digital Section Controls and Indicators

Digital Level and Metering

Details the digital input level controls and 20-segment meters.

Sample Rate Selection

Explains the sample rate selection knob and indicator LEDs.

External Sync and Locking Indicators

Covers the External Sync LED behavior and slaved unit indication.

Rear Panel Audio Connections Explained

Microphone and Line Input/Output

Details the XLR microphone input and line-level output.

Analog Insert Connection

Describes the 1/4" TRS input for the A/D converter.

Using the Insert Loop

Explains how to connect external processing devices via the insert.

Rear Panel Digital Connections Explained

Digital Audio Outputs

Details the SPDIF and AES/EBU digital outputs.

Sync Input and Clock Derivation

Explains the BNC sync input and sample rate derivation.

Master/Slave Linking Setup

Details D-Sub linking and required setup before connecting units.

Rear Panel Power Information

Voltage Selection and Fuse

Covers the voltage select switch and fuse replacement guidelines.

AC Power Input Connector

Describes the IEC-type grounded AC input plug.

Technical Specifications - Analog

Analog Input/Output Specifications

Lists input/output impedance, levels, frequency response, noise, and distortion.

Analog Controls and Metering Specs

Details VU meter calibration and listed controls.

Physical and Power Specifications

Provides current draw, weight, and unit dimensions.

Technical Specifications - Digital

Digital Performance Metrics

Details dynamic range, THD+N, and group delay at various sample rates.

Digital Interface and Accuracy

Covers input impedance, isolation, CMRR, phase deviation, and gain drift.

User Record Keeping

Serial Number and Purchase Date

Placeholder for recording the unit's serial number and purchase date.