The Audio Precision APx515 B Series is a highly reputable high-end audio analyzer in the audio industry. It is a benchmark instrument in the fields of audio equipment design, verification, and production testing.

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Core Positioning and Overview

Instrument Type: Dual-channel audio analyzer
Manufacturer: Audio Precision (AP), a global leader in audio testing.
Core Function: Simultaneously generates extremely pure audio signals and performs high-precision audio measurements. It integrates a signal generator, analyzer, digital interfaces, and automation software into one system.
Series Positioning: A core model in the APx500 series, striking a perfect balance between performance and price. It meets demanding R&D needs while also being suitable for high-speed automated production testing.

The "B Series" indicates that it is the second hardware revision of this model, typically featuring optimizations and upgrades in interfaces, performance, or functionality.

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Key Technical Parameters and Features

1. Analog Performance (Core Strengths)
| Parameter | Performance (Typical) |
| :--- | :--- |
| Analog Output | 2 Channels |
| Output THD+N | -108 dB (0.0004%), 20 Hz - 20 kHz, @ 2 Vrms |
| Output Frequency Response | ±0.005 dB, 20 Hz - 20 kHz |
| Output Amplitude | Up to 18 Vrms (Balanced) |
| Analog Input | 2 Channels (Expandable to 4 Channels) |
| Input THD+N | -116 dB (0.00015%), 20 Hz - 20 kHz, @ 2 Vrms |
| Input Frequency Response | ±0.005 dB, 20 Hz - 20 kHz |
| Input Amplitude | Up to 18 Vrms (Balanced), capable of measuring signals as low as 3 μV |
| Dynamic Range | > 120 dB |

2. Digital Audio Interfaces (Standard)
S/PDIF (RCA Coaxial and TOSLINK Optical): Supports sample rates up to 192 kHz.
AES/EBU (XLR): Supports sample rates up to 192 kHz.
HDMI (Optional): Supports Audio Return Channel (ARC) and Enhanced Audio Return Channel (eARC) testing.
USB Audio (via Host PC): Allows the APx515 to function as a USB audio interface for testing USB audio devices.
Bluetooth (Optional): Integrated BT? test module for testing the transmission and reception performance of Bluetooth audio devices.

3. Key Measurement Capabilities
The APx515 runs the APx500 measurement software, offering over 70 measurement types, including but not limited to:
Level, Gain, Phase
Frequency Response
Total Harmonic Distortion + Noise (THD+N)
Intermodulation Distortion (IMD)
Signal-to-Noise Ratio (SNR)
Separation / Crosstalk
Multitone Test, Maximum Power, Clipping Detection
Jitter (Digital Interfaces)
Wow & Flutter (for analog tape decks, turntables, etc.)

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Key Features and Advantages

1. Exceptional Accuracy and Performance: AP's "golden ear" level performance is the industry reference standard. Its ultra-low noise floor and distortion ensure authoritative measurement results.
2. All-in-One Design: No need for additional signal sources, analyzers, or digital interfaces—a single system handles all tests.
3. Powerful APx500 Software:
Intuitive Graphical Interface: Easily configure measurement sequences and create test projects.
Automation Sequence Function: Drag and drop multiple tests to create a complete testing workflow that runs with a single click.
Production Test Mode: Provides a simple "Pass/Fail" interface and supports barcode scanning, data logging, and Statistical Process Control (SPC), making it ideal for production lines.
4. Rich Optional Modules: Such as HDMI, Bluetooth, and analog expansion (adding input/output channels), allowing upgrades based on future needs.
5. Reliability: Designed for 24/7 continuous operation in production environments, ensuring stability and dependability.

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Typical Applications

1. Audio Equipment R&D: Used in designing and validating high-end consumer audio products (e.g., amplifiers, DACs, speakers), professional audio equipment (mixers, audio interfaces), automotive audio systems, and telecommunication devices.
2. Production Testing: Performs 100% functional and performance testing on audio products at the end of production lines to ensure every unit meets specifications.
3. Quality Inspection and Compliance Testing: Verifies whether products comply with industry standards (e.g., IEC, ANSI, ITU-T) or internal corporate standards.
4. Component Characterization: Tests the performance of components such as operational amplifiers, AD/DA converters (ADC/DAC), and audio codecs.

Summary

The Audio Precision APx515 B Series is the professional-grade "Swiss Army Knife" and industry gold standard in audio engineering. It represents one of the highest standards in audio measurement instruments.

For audio engineers, it is an indispensable tool for precise design and in-depth debugging.
For manufacturing companies, it is a critical device for improving product quality and ensuring production consistency and efficiency.

If your work revolves around audio performance, the APx515 is one of the most powerful and reliable tools you can own. Its price reflects its professional status, making it a common choice for large enterprises, high-end manufacturers, and experienced engineers.
Shenzhen Bao'an Shajing Fangfengrui Instrument Equipment Business Department is a company integrating electronic instrument sales, test solutions, pre-sales services, instrument repair, instrument rental, recycling, and calibration services.