AP - The Recognized Standard In Audio Test

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AP 2722

For SYS-2702, SYS-2712, SYS-2720, and SYS-2722

About AP Specifications

AP specifications in hard copy booklets & brochures can be out of date. The specifications documents available for download from our Web site have the most current and correct information. If there is a conflict between printed and online specifications, the online version is the prevailing document.


API Development Tools (3) Accessories (2) Configuration Files (0) Datasheets (4) Software (6) Technotes and AP Applied (13) Test Signals and Waveforms (0) User Manuals and Specifications (12) Utilities, Projects, Plug-ins & Macros (24) Whitepapers, Articles, and Books (5)

API Development Tools

2700 Series LabVIEW Driver v1.0.1

Audio Precision has developed a complete LabVIEW project-style instrument driver for IEEE 488.2 (GPIB) equipped models of the 2700 Series of audio analyzers. This driver supports NI LabVIEW 8.20.


AP2700 C# Using References v1

Example utilizing C# for AP2700 "using references" (Visual C# 2005).


AP2700 LabVIEW Examples v3.3

LabVIEW VI examples for controlling 2700 Series and System Two Cascade instruments using AP2700 control software and ActiveX automation. For usage instructions, see Technote 101.

This is for controlling type "A" instruments, or type "G" instruments via the APIB bus. For LabVIEW control via GPIB, download the 2700 Series LabVIEW Driver instead. Requires LabVIEW 2009 or higher.



RAK-SYS2 Rackmount Kit Instructions v1.0

Rackmount instructions for 2700 and System 2


Configuration Files

No files in this category



2700 Series Datasheet (View previous versions)

The 2700 Series is designed for audio engineers who need the highest performance, lowest distortion and greatest flexibility possible in their audio analyzer.


2722A-M Datasheet

The 2722A-M is a special package that includes the 2722A analyzer along with all the filters and cables required by the Microsoft Driver Test Manager for the Windows Vista Logo Program Audio Fidelity tests. For other uses, please refer to the regular 2700 Series datasheet.


APx555 & 2700 Series Audio Analyzers Comparison v2 (View previous versions)

A brief, two-page comparison of the APx555 and 2700 Series Audio Analyzers.

Available translations


High Speed Test in Production & Broadcast v3.1

High Speed Tester (HST) is a fast, accurate and easy-to-operate audio test application that is ideal for high speed production test or testing transmission quality across a broadcast network.



AP2700 Add-ins v3.30

Add-Ins are additional software features that can be seamlessly integrated into the AP2700 user interface. AP uses the standard Windows "Add/Remove Programs" exclusively to manage Add-Ins. Add-In Descriptions User Preferences -- Provides a user interface where you can set user preferences, define multiple preference groups and control how the preferences are applied to tests. Document Test Settings -- Creates an ASCII text file that documents selected panel settings for the current test configuration. Delete Traces-- Provides the capability to delete selected traces from the Graph / Data Editor. Sweeps that have any traces removed from view in the Graph are deleted.


AP2700 Control Software v3.3 SP2 (View previous versions)

Compatible with 2700 Series, System Two Cascade, and System Two Cascade Plus.

Version 3.3 SP2 (and SP1) supports 64-bit Windows 7 using the APIB-USB adapter. The OPT-2711 (Dolby Digital generator option) is not supported. Instruments with OPT-2711 installed will function correctly on a 64-bit PC, but the Dolby Digital generator will not be available.

For Windows 8, please also download the AP2700 Windows 8 USB Driver and follow the included instructions.

More detailed information is available on our AP Software and Windows Compatibility chart.


AP2700 DspRiff4.ocx Update v3.3x

AP2700 v3.30 has an issue with the Import .wav File function, causing file truncation and frequency error correction problems. This can be corrected by replacing the DspRiff4.ocx file in the C:\Program Files\Common Files\Audio Precision folder with this version.

This issue has been corrected in AP2700 v3.30 SP1. We recommend that you download and install SP1 or later instead of just replacing this file, as it addresses some other issues as well as adds a driver for 64-bit versions of Windows.


AP2700 Momentum DSP Filter Design Package

The Audio Precision Filter Design Package (APFDP) has been produced by Momentum Data Systems, Inc., to allow the user to create DSP filters for downloading to Audio Precision System Two Cascade hardware. The manual below explains the operation of APFDP. It is not intended to be a tutorial on digital signal processing, since there are many excellent texts on the subject, and it is assumed that the user has had a certain amount of academic or professional exposure to the subject. More advanced versions of this software are available, including versions enabling the design of finite impulse response (FIR) filters. These versions also support more powerful filter design techniques. Please call Momentum Data Systems for further information. Zip file contains APFDP manual (.pdf file) APFDP Executable application (.exe file) 4 sample test tiles (.spc file) Read me (.txt file) PLEASE NOTE: This package is no longer supported by AP and is available as a convenience to our customers.


AP2700 and ATS Windows APIB Drivers

Audio Precision's proprietary APIB interface bus requires the installation of the proper Windows driver software on your PC.


AP2700 and ATS Windows USB Drivers

Drivers for running AP2700 and ATS software in Windows 7 and 8 using the AP USB-APIB Adapter. Includes instructions. See the KB article AP Software Windows Version Compatibility for more information.


Technotes and AP Applied

Technote 101: LabVIEW ActiveX Automation for System Two / 2700 Series v1

TECHNOTE 101 describes the basic principles and techniques needed to operate System Two / 2700 Series instruments using the Audio Precision control software as an Active X automation server within the LabVIEW environment. Although it is possible for LabVIEW to directly control GPIB versions of Audio Precision instruments, GPIB control of Audio Precision systems is not the subject of this TECHNOTE. Instead, TECHNOTE 101 deals with the capability of LabVIEW to control the standard APIB versions of Audio Precision PC-controlled instruments via the instrument control software, using Microsoft ActiveX automation.


Technote 102: Using Audio Precision High Speed Tester (HST) v2.01

The AP High Speed Tester (HST) application was originally developed to test playback only devices on the production line. The objective was a fast, accurate and easy-to-operate test station with a limited graphical user interface that just indicated the test results and had the ability to save results to a log file.

In addition testing play-back devices, HST 2.0 can use the instrument's generator to drive the input of the device under test. Both input and output can be set to digital or analog, and limits, user prompts and sample rate can be defined easily via a new setup utility.

This flexibility allows HST 2.0 to test almost any type of audio device - amplifiers, DACs, ADCs, signal processors, MP3 / DVD players etc. - quickly and easily.

Available translations


Technote 104: Introduction to the Six Basic Audio Measurements v2

Technote 104 discusses methods of making a set of basic measurements using an Audio Precision 2700 Series or ATS-2 audio analyzer.These are Level Frequency Response THD+N Phase Crosstalk Signal-to-Noise Ratio

Available translations


Technote 106: Measuring PSRR (Power Supply Rejection Ratio) v0

In this technote we describe and compare two different methods to measure PSRR. Then we give instructions for using the APx PSRR Measurement Utility, which simplifies the calculations and graphing on APx analyzers.

This technote is included in the APx PSRR Measurement Utility download.


Technote 108: PC Audio Testing v0

This Technote discusses the techniques necessary to perform the “Basic Six” audio measurements on consumer-level PC audio devices. This category includes sound systems integrated into notebooks, netbooks, tablets, and PC motherboards, as well as expansion cards and some external devices. It doesn’t include USB-connected headsets, nor pro-audio devices with balanced input and output connections.

Includes APx project and .wav test signal files for playback


Technote 110: Legacy Instrument Migration to APx v0

Addresses conversion of tests and procedures/macros written using AP’s Windows based APWin, AP2700, or ATS software to APx500. If you are using AP’s DOS based S1.EXE software for System One, please refer to Technote 109 instead.


Technote 114: Measuring Phantom Power v1

Describes how to test microphone preamplifier phantom power, with and without simultaneous audio. You may instead download the "APx Phantom Power Measurement Project," which runs the tests (that download also includes this Technote).


Technote 115: Measuring Microphone Preamplifier Noise

Making noise measurements of microphone preamplifiers (and other high-gain circuits) involves special techniques that differ from those used to measure low-gain devices. This technote explains the theory as well as how to make these measurements.


Technote 118: Measuring Jitter with J-Test

Describes how to use J-test, a special digital test signal which stimulates worse-case jitter over an AES3 or SPDIF digital audio connection. It allows jitter to be measured on an analog output after D/A conversion.


Technote 15: GPIB Communication from AP Basic

This Technote describes how to setup communication between AP Basic and GPIB instrumentation (using the National Instruments GPIB Interface.)


Technote 27: Polarity Test Procedure

This utility determines the signal polarity between the Analog Generator Outputs and the Analog Analyzer Inputs. A common error in manufacturing of loudspeaker systems is to connect voice coils with reversed polarity. Even when all drivers in a multi-way system are phased correctly with respect to one another, it is possible to have the interior wiring to the external connection terminals of the cabinet reversed. An individual driver reversed will cause a dip in frequency response near the crossover frequency to the adjacent driver, since the two speakers are then producing acoustical output of nearly identical amplitudes but out of phase. An entire system wired out-of-phase would presumably be undetectable in a monaural application, but unacceptable in stereo systems. With minor adjustments, this procedure can be run as a stand-alone test, or it can be incorporated into other test setups. The procedure can test a single path, or it can test stereo channels. Equipment required is DSP or Dual-Domain version of System One, System Two, or System Two Cascade, and a microphone if you are testing acoustic paths such as loudspeakers.


Technote 28: Measurement Microphone dBSPL Calibration

This Technote describes how to set up and use the dBr unit as dBSPL. Automated AP Basic macros (procedures) are available to facilitate the calibration. These macros apply to the instrument analog analyzers. Additionally, two computational methods are described to help you understand the macros, and to help you calibrate a measurement microphone without the macros.


Technote 29: Computing Group Delay from Phase Data Using APWIN

Group delay is a property of a device or a system: a plot of the change in phase of the response as a function of frequency; it is the negative derivative (slope) of the phase-vs-frequency characteristic of a device. Constant group delay across the frequency band means that all portions of a wideband signal arrive simultaneously. A pure time delay, equal at all frequencies, gives a level straight-line plot of phase versus frequency. In an audio component, this plot may vary with frequency, and the component is said to produce group delay distortion. Group delay is of interest to audio engineers, particularly in the design and test of low-pass filters used in digital audio and in loudspeaker design areas. For instance, an anti-aliasing filter will typically have a phase response curve which slopes sharply down at high frequencies. This means that the high-frequency components will be delayed longer in their passage through the filter, resulting in a loss of precision in musical transients and a more diffuse stereo image. It is possible to correct the group delay distortion of such filters by using an all-pass network, but this is seldom done in practice.


Test Signals and Waveforms

No files in this category


User Manuals and Specifications

2700 Series Full Specifications v009

2700 Series Full Specifications

AP specifications in hard copy booklets & brochures can be out of date. The specifications documents available for download from our Web site have the most current and correct information. If there is a conflict between printed and online specifications, the online version is the prevailing document.


2700 Series Getting Started Guide v3.32

Getting Started With Your 2700 Series Instrument

Available translations


2700 Series User Manual v3.30

2700 Series User Manual


2700 Series User-built Weighting Filter Construction Guide v4


AP Basic Extensions for 2700 Series Instruments v3.30


AP Basic Language Manual v4 (View previous versions)

AP Basic Language Manual (previous versions titled: APWIN Basic User's Guide and Language Reference)


AP2700 and ATS Keyboard Shortcuts


S-AES17 Filter User Guide v3

S-AES17 Filter User Guide


SYS-2700A-M v0

SYS-2700A-M Windows Vista logo testing Getting Started Guide


System Two Family Filter Installation Instructions

System Two Family Filter Installation Instructions


USB-APIB Kit Installation and User Guide v1

USB-APIB Kit Installation and User Guide


Utilities, Projects, Plug-ins & Macros

2700 Series S-AES17 and OPT-2020 Filter Set Bit Macro

This AP Basic macro reads or sets the 2700 series instrument EEPROM firmware configuration to indicate the currently installed pre-analyzer filter (S-AES17 or OPT-2020). If you install or remove pre-analyzer filter hardware, you must set the EEPROM configuration for correct software operation. Requires AP2700 or APWIN version 2.24 or later control software.


AP Basic Database Connectivity Sample Files v1.0


AP Basic Scripting Sample Files v1

These files accompany the "AP Basic Scripting" training video found at http://ap.com/support/training


AP2700 & ATS-2 Resources Disc v102

The Audio Precision Resources Disc contains Sample Tests, the Performance Check and documentation to help you operate your AP2700 or ATS control software compatible audio analyzer. AP2700 or ATS control software is required. The installer includes both AP2700 and ATS-2 resources. You will be prompted to choose which components you wish to install.


AP2700 ADSR Measurement Test

This measurement looks at the four segments of an envelope expressed as amplitude vs. time; Attack, time for a signal to reach full amplitude, Decay, time for the signal to drop from the initial attack level to the sustain level, Sustain, time the signal remains at the constant amplitude, and Release, time for the signal to return to an off or zero amplitude condition.


AP2700 Complex Impedance Macros v1

Includes instructions and discussion.


AP2700 Crest Factor Test v1

File configured to measure crest factor. See knowledge base article for complete explanation.


AP2700 DIM Measurement Macro v1

Accompanies KB article "DIM 30 and DIM 100 Measurements per IEC 60268-3 with AP2700"


AP2700 Damping Factor and Output Impedance Measurement Macro v2.0

Measures and graphs the damping factor and output impedance vs. frequency of a power amplifier.


AP2700 External Crosstalk vs Frequency Test

Accompanies KB article "Open Loop Crosstalk vs. Frequency."


AP2700 FFT Scaling for Noise Macro v1

AP2700 macro and test file to accompany the KB article "FFT Scaling for Noise."

Contains several functions that are useful for performing calculations on FFT spectra, including FFT spectrum integration with window correction. There is also a subroutine that will convert a measured FFT spectrum to amplitude spectral density in dB relative to 1.0 V/√Hz, or FS/√Hz, and plot it on the graph.


AP2700 Frequency Error Correction Test

This AP2700 test file accompanies the KB article "Syncing the 2700 Series Generator to an External Reference."


AP2700 Glitch Detection Test

AP2700 test file to accompany the knowledge base article on Glitch Detection.


AP2700 GraphBuilder Macro v2.0 (View previous versions)

GraphBuilder is a macro that extends the two-dimensional graph capability built into AP2700 and ATS control software to include three dimensional and polar graphs. For use with APWIN, download the previous version (1.1).


AP2700 I2S Jitter Measurement Test v1

This file accompanies the knowledge base article "I2S jitter measurement with the SYS-2722." It demonstrates how to measure digital interface jitter using the digital unbalanced input of the instrument.


AP2700 PSRR Test

Tests PSRR (power supply rejection ratio). See the associated KB article for instructions. Contains .at27 test and .ads sweep file.


AP2700 Prompt Using Windows API Macro

This AP Basic macro demonstrates the use of a modified AP.Prompt for use in control loops. It allows the AP.Prompt text to be changed while a prompt is displayed without flashing or refreshing the entire prompt window.


AP2700 Sample Rate Error Measurement Macros v2

Many devices contain internal clocks that are not accessible but that need to be measured. Examples include the A/D converters in USB headsets, and the D/A converters in MP3 players and smart phones. The internal sample rate error of these types of devices can be indirectly determined by measuring the frequency error of a known tone. This download contains two AP2700 macros that calculate the error. See the associated KB article for instructions.


AP2700 Send Bar Graph Data to Serial Port Macro

Macro and test file demonstrate how to send a bar graph reading to an RS-232 serial port.


AP2700 and ATS Get all FFT Bins Macro v1

Illustrates setting up the sweep panel to return all FFT bins. For 2700 Series and ATS-2. The macro includes a function that gets the Sample Rate and FFT length, and in addition to setting up the sweep panel, it retrieves the FFT level spectrum in units of Volts.


AP2700 and ATS Graph Trace Setting Macro v1

Lets you set the graph trace properties quickly (line color, thickness, pattern, comments), even if you aren’t otherwise using macros or automation, by adding this macro to your Quick Launch toolbar.

Zip file includes macros for AP2700 and ATS, and Quick Launch installation instructions.


AP2700 and ATS Split Stereo Waveform Macros v0

The ATS-2 and 2700 Series GPIB implementation requires that waveforms loaded into the analog and digital Arbitrary waveform buffers be mono files. Many of the sample waveforms provided for the two instruments are Stereo. This download contains two macros, one for each instrument, that can be used to split the stereo waveform into mono files.


Matlab Toolbox v5.1

Set of MATLAB functions for audio applications such as reading and writing waveforms and filters for 2700, ATS-2, and APx


System Two Family Performance Check v1.24

System Two Family Performance Check (Perf Check) for all System Two and 2700 Series instruments. Running the Performance Check verifies proper instrument operation, and provides diagnostic data for Technical Support evaluation before sending an instrument in for service.


Whitepapers, Articles, and Books

Appnote 5: Measurement Techniques for Digital Audio (Julian Dunn) v2

This book by the late Julian Dunn examines in great detail techniques for evaluating the performance of converters and digital interfaces.

Includes a full set of AP2700 macros and tests that accompany the text.


How to Write (and Read) Audio Specifications

Discusses writing and reading good audio specifications. Guidelines are provided, then key specifications for two classes of audio device are examined for correct expression and form, with examples of real-world specs for comparison.


Limitations in making audio bandwidth measurements in the presence of out of band noise

Audio analyzers are optimized to make high quality measurements up through their maximum specified bandwidths. The presence of significant energy above these bandwidths can have a profound effect on the audio measurements and possibly induce errors. This white paper provides valuable information on avoiding the possibility of errors when testing digital to analog converters and other audio devices that contain significant energy above the audio band. Written by Bruce Hofer


Measuring Switch-mode Power Amplifiers

Switch-mode audio power amplifiers are becoming increasingly popular due to their smaller size, lower weight, and improved efficiency. Their advantages are obvious in low power battery operated personal audio players and laptop computers. However they are also progressively displacing more traditional linear designs in mainstream applications such as home entertainment systems, automotive sound systems, and professional installations where high quality audio is important. Measuring the performance of switch-mode amplifiers presents some new and unique challenges. They inherently generate ultra-sonic artifacts and spurious signals with slew rates that can provoke non-linear behavior within the input stages of high quality audio test and measurement equipment. Absolutely worthless and inaccurate results can result unless effective measures are taken to prevent this non-linear behavior. Written by Bruce Hofer.

Available translations


The Audio Measurement Handbook v1

This reference handbook is a practical, hands-on guide for workers in all phases of the audio field. It covers basic tools and techniques, common environments for audio testing, application of these techniques to common audio devices, the typical ranges of performance to expect in different devices, and a glossary of terms and key specifications used in audio measurement. 178 pages Written by Bob Metzler.

Available translations


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