Virtins technology Rta-168c User manual

VT RTA-168C Manual Rev. 1.5

Virtins Technology

VT RTA-168C Manual

A Real Time Acoustic Analyzer, Sound Level Meter, Distortion Analyzer,

Polarity Tester, …

Note: VIRTINS TECHNOLOGY reserves the right to make modifications to this manual at any time without

notice. This manual may contain typographical errors.

VT RTA-168C Manual Rev. 1.5

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TABLE OF CONTENTS

1 INSTALLATION AND QUICK START GUIDE..........................................................................................3

1.1 PACKAGE CONTENTS....................................................................................................................................3

1.2 HARDWARE CONNECTION DIAGRAM............................................................................................................4

1.3 HARDWARE DRIVER INSTALLATION.............................................................................................................5

1.4 MULTI-INSTRUMENT SOFTWARE INSTALLATION AND CONFIGURATION.......................................................5

1.4.1 Install Multi-Instrument.......................................................................................................................5

1.4.2 Start Multi-Instrument..........................................................................................................................5

1.4.3 Configure Multi-Instrument.................................................................................................................7

1.5 INPUT OF SOUND LEVEL CALIBRATION DATA AND ADJUSTMENT OF INPUT GAIN........................................9

1.5.1 Under Windows XP or a Windows Version Before XP ......................................................................10

1.5.2 Under Windows Vista.........................................................................................................................10

1.5.3 Under Windows 7...............................................................................................................................11

1.5.4 Under Windows 8/8.1/10....................................................................................................................13

1.5.5 0dB Reference Vr...............................................................................................................................14

1.6 MICROPHONE FREQUENCY COMPENSATION ...............................................................................................14

1.7TWENTY MOST FREQUENTLY USED MEASUREMENT SETTINGS .................................................................17

1.8 MORE ACOUSTIC ANALYSIS FUNCTIONS AVAILABLE IN MULTI-INSTRUMENT PRO OR ABOVE..................20

1.9 LIST OF AUDIO TEST WAV FILES (AUDIOTESTCD.ZIP) .............................................................................20

1.10 OPERATION NOTES ...................................................................................................................................22

2 SPECIFICATIONS.........................................................................................................................................23

2.1 HARDWARE SPECIFICATIONS......................................................................................................................23

2.2 MULTI-INSTRUMENT SOFTWARE SPECIFICATIONS......................................................................................24

3 MULTI-INSTRUMENT SOFTWARE LICENSE INFORMATION ........................................................33

3.1 LICENSE TYPES...........................................................................................................................................33

3.2 LICENSE UPGRADE FROM ONE LEVEL TO ANOTHER...................................................................................33

3.3 SOFTWARE UPGRADE IN THE SAME LICENSE LEVEL...................................................................................33

4 WARRANTY...................................................................................................................................................33

5 DISCLAIMER.................................................................................................................................................34

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1 Installation and Quick Start Guide

1.1 Package Contents

A standard VT RTA-168C Package contains the following items:

1) USB Measurement microphone and its accessories (a windshield, a microphone clip and

stand)

2) USB cable (3 m)

3) CD (containing the copy-protected Multi-Instrument Software)

The latest software can always be downloaded from www.virtins.com/MIsetup.exe.

4) USB hardkey (containing a Multi-Instrument Standard License)

5) Audio Test WAV files (containing a list of audio test tones and noises)

They can be downloaded at: www.virtins.com/AudioTestCD.zip and then burnt into a CD

or saved into a USB memory stick. They can also be generated directly from the Signal

Generator of Multi-Instrument.

6) 1/8” TRS cable (1.8m)

USB Measurement Microphone

Windshield

Microphone Clip and Stand

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7) Black Soft Pouch Case

8) Unique Sound Level Calibration Data (in CD)

9) Unique Microphone On-Axis and 90-degree Calibration Data (in CD)

1.2 Hardware Connection Diagram

Connect the corresponding ends of the USB cable to the USB measurement microphone and

a PC’s USB port. When this is complete, the blue LED lights up indicating that it is receiving

power.

Software Activation

The USB hardkey needs to be plugged into any USB port of the PC in order to activate the

Multi-Instrument software. Otherwise the software will run under the 21-day fully functional

free trial mode before the trial period expires.

Test Signal Generation

You can generate the test signals from the Signal Generator of Multi-Instrument. The USB

measurement microphone does not have any audio output channels, so you need to use your

computer’s built-in sound card or any other sound card for audio test signal output. The

quality of the test signals would depend on the sound card used. Generally, the built-in sound

card of a laptop is good enough for generating quality test signals for magnitude frequency

response measurement of an audio system.

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The 1/8” TRS cable provided in the product package can be used to connect the sound card’s

audio output (e.g. Line Out, Headphone, Speaker) to the AUX input of the audio system

under test.

Alternatively, you can play the test signals from an audio CD or a memory stick.

1.3 Hardware Driver Installation

No hardware driver installation is required. It is supported by Windows natively.

1.4 Multi-Instrument Software Installation and Configuration

Multi-Instrument is a powerful multi-function virtual instrument software. It supports a

variety of hardware ranging from sound cards which are available in almost all computers to

proprietary ADC and DAC hardware such as NI DAQmx cards, VT DSOs and so on. It

consists of multiple test instruments such Oscilloscope, Spectrum Analyzer, and Multimeter,

etc.

1.4.1 Install Multi-Instrument

Insert the Multi-Instrument installation CD into your computer’s CD-ROM drive and follow

the instruction on the screen to install the Multi-Instrument software. The installation file

can also be downloaded from www.virtins.com/MIsetup.exe.

1.4.2 Start Multi-Instrument

To start Multi-Instrument, on the Windows desktop, select [Start]>[All Programs]>[Multi-

Instrument]>[VIRTINS Multi-Instrument], or simply double click the MI icon.

If the software is started for the very first time after installation, it will prompt the user to

select a default device (see figure below). Select VT RTA-168C according to the hardware

device to be used.

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The default device can also be changed later via [Setting]>[ADC Device], [Setting]>[DAC

Device], and [Setting]>[Configure Hot Panel Setting Toolbar], or simply [Setting]>[Restore

to Factory Default]. However, if [Restore to Factory Default] command is executed, all

calibration data entered manually via [Setting]>[Calibration] after software installation

will be reset to the default values of the selected product. To avoid the loss of the

manually entered calibration data, you can save them as a calibration file first.

Otherwise, you will have to enter the unique calibration data that come with the

product package again.

After the default device is selected, the software will prompt the user to select a default color

scheme (Skin). The default skin can also be changed later via [Setting]>[Display].

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The main window of the software will open after the above skin selection. The following

figure shows a typical screen layout (obtained by clicking the “OCT3” button in the Hot

Panel Setting Toolbar after the launch of the software). Please refer to the software manual

for detailed functions of the software. The software manual can be accessed via [Start]>[All

Programs]>[Multi-Instrument]>[VIRTINS Multi-Instrument Manual] (in PDF format) or

[VIRTINS Multi-Instrument Help] (in HTML format) on Windows Start menu, or

[Help]>[Software Manual] or F1 inside the software.

1.4.3 Configure Multi-Instrument

In Multi-Instrument, the menu items are enabled/disabled based on context. Many menu

items are disabled when the Oscilloscope or the Signal Generator is running. To do the

configuration, stop the oscilloscope first by pressing the green button at the upper left corner

of the screen (see figure below). The button will turn red once the Oscilloscope is stopped.

1.4.3.1 Configure Sound Recording Devices for Multi-Instrument

Go to [Setting]>[ADC Device], and choose “Umik-1” , “Microphone (Umik-1)” and the like

in the “Device No.” field (see figure below). This is to configure the USB measurement

microphone Umik-1 as the sound recording device for the software. Note that the displayed

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name of the USB microphone may vary a bit under different Windows versions. The

“Device Model”field must be set to “Sound Card MME”.

Under Windows XP or a Windows Version Before XP

Under a Windows Version after XP

Now, if you start the oscilloscope by pressing the red button at the upper left corner of the

screen, and then talk before the measurement microphone, you should be able to see your

“voices” in the Oscilloscope and Spectrum Analyzer.

1.4.3.2 Configure Sound Playback Devices for Multi-Instrument

The USB microphone does not have any audio output channels, but you can use your

computer’s built-in sound card or any other sound card for audio test signal output, if you

want to use the Signal Generator in Multi-Instrument to generate the test signals. To

configure the sound card for the Signal Generator, go to [Setting]>[DAC Device] and choose

the corresponding sound card’s name in the “Device No.” field. By default, Multi-

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Instrument will use the computer’s built-in sound card for signal output. Again, the “Device

Model”field must be set to “Sound Card MME”.

Now, if you press the Signal Generator button (see figure above), the Signal Generator panel

will be opened (see figure below). Press the red triangle button at the upper right corner of

the Signal Generator panel, you should hear a 1kHz test tone from the speaker or earphone

connected to the selected playback sound card. Press it again to stop the sound.

1.5 Input of Sound Level Calibration Data and Adjustment of Input Gain

Sound Level Calibration is not required for those relative measurements such as frequency

response, THD, THD+N, IMD, etc.. It is required only if you want to measure the absolute

sound level.

The USB measurement microphone has been calibrated in the factory. The sound level

calibration data are provided in a separate sheet inside the product package. Please refer to

the calibration data sheet provided and enter the calibration data in the respective highlighted

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fields in the Calibration Setting dialog box (see figures below). Note that different calibration

data are required for different Windows versions. The Calibration Setting dialog box is

opened via [Setting]>[Calibration] in Multi-Instrument.

You can adjust the sound level measurement range by adjusting the input gain of the USB

sound card through software.

1.5.1 Under Windows XP or a Windows Version Before XP

Input of the Sound Level Calibration Data

Note the calibration data in the following figure are examples only, you should enter the

actual calibration data provided inside the product package.

Adjustment of Input Gain via Software

Under Windows XP or a Windows version before XP, the input gain of the USB microphone

is not adjustable. Neither the Recording Control under Windows Control Panel nor Multi-

Instrument can adjust the input gain.

1.5.2 Under Windows Vista

Input of the Sound Level Calibration Data

Note the calibration data in the following figure are examples only, you should enter the

actual calibration data provided inside the product package.

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Adjustment of Input Gain via Software

Under Windows Vista, the input gain of the USB microphone is not adjustable in the Sound

Recording Tab under Windows Control Panel. However, you can adjust it by clicking the

respective radio buttons beside the “Mic 100%”, “Mic 80%”, “Mic 60%”, “Mic 40%” and

“Mic 20%” in the above figure. It should be noted that the selection status of these radio

buttons does not necessarily reflect the actual input gain (For example, when you open the

Calibration Setting dialog box, if the selected radio box is “Mic 80%”, it does not necessarily

mean the current input gain is set at 80%.). The actual input gain is reflected by the “Mixer”

status under the “Sound Card Input Status” in the above figure. You can press the “Refresh”

button to make sure the status display has been refreshed.

1.5.3 Under Windows 7

Input of the Sound Level Calibration Data

Note the calibration data in the following figure are examples only, you should enter the

actual calibration data provided inside the product package.

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Adjustment of Input Gain via Software

Similar to Windows Vista, you can adjust the input gain by clicking the respective radio

buttons beside the “Mic 100%”, “Mic 80%”, “Mic 60%”, “Mic 40%” and “Mic 20%” in the

above figure. It should be noted that the selections status of the radio button does not

necessarily reflect the actual input gain (For example, when you open the Calibration Setting

dialog box, if the selected radio box is “Mic 80%”, it does not necessarily mean the current

input gain is set at 80%.). The actual input gain is reflected by the “Mixer” status under the

“Sound Card Input Status” in the above figure. You can press the “Refresh” button to make

sure the status display has been refreshed.

Unlike Windows Vista, the input gain is adjustable in the Sound Recording Tab under

Windows Control Panel. You can access the Sound Recording Tab by clicking the “Windows

Recording Control” button (see figure below) in Multi-Instrument.

This will bring up the Sound Recording Tab (see left part of the figure below).

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If you right click “Microphone (Umik-1 Gain: 18dB)” and select “Properties”, the right part

of the figure above will be shown. You can then adjust the input gain through the

“Microphone” slider.

1.5.4 Under Windows 8/8.1/10

Input of the Sound Level Calibration Data

Note the calibration data in the following figure are examples only, you should enter the

actual calibration data provided inside the product package.

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Adjustment of Input Gain via Software

Same as Windows 7

1.5.5 0dB Reference Vr

The “0dB Reference Vr”in the Calibration Setting dialog box is used to finally calibrate the

input voltage to dBSPL. The input voltage here should be considered as a relative value as

the actual input is not a voltage but a sound pressure. The “0dB Reference Vr”is the

parameter to be recalibrated if a sound level recalibration is necessary. To do the

recalibration, simply enter the actual sound level value into the “Actual Value”edit box and

the measured sound level value into the “Read Value”edit box, and then press the

“Calculate”button once.

1.6 Microphone Frequency Compensation

The measurement microphone in RTA-168 series has an extremely flat frequency response in

the audio frequency range. Generally, there is no need to compensate for the microphone

frequency response. However, a higher degree of accuracy can be achieved if the

microphone comes with a frequency response file or a frequency compensation file. The

difference between these two files is the sign of the gain values (in dB). For example, a gain

of 3dB in a frequency response file should have a gain of -3dB in its equivalent frequency

compensation file.

The USB microphone Umik-1 in RTA-168C comes with an individually calibrated Original

Frequency Response File RTA-168C.txt. “Original” means that it has exactly the same

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format and contents as the calibration file provided by the microphone manufacturer. This

file is located in the CD directory “\Microphone Frequency Compensation File”. Please

copy this file to the “\fcf”directory under the root directory of Multi-instrument in the

hard disk (if the file already exists, overwrite it), so that you can use it later. This file is

also used by the twenty default panel settings configured in the Hot Panel Setting Toolbar

(The third toolbar from the top).

You can load the Original Frequency Response File by right clicking anywhere within the

Spectrum Analyzer window, selecting [Spectrum Analyzer Processing]> “Intra-Frame

Processing”> “Compensation 1”, changing the “Files of type”from “Frequency

Compensation File (*.fcf)”to “Original Frequency Response File (*.txt)”in the pop-up File

Open dialog box, and loading that file (see figures below). If you want to apply it to the

twenty most frequently used panel settings in the Hot Panel Setting Toolbar, you will need to

configure and save the corresponding panel setting files one by one. Luckily, this has already

been done for the twenty default panel settings.

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The above frequency compensation file RTA-168C.txt is actually copied and renamed from

the original calibration file supplied by the manufacturer of Umik-1. Two original calibration

files are provided: one for 0 degree (on-axis) and the other for 90 degree. The RTA-168C.txt

is renamed from the 0 degree calibration file by default. Normally the 0 degree file should be

used in a mono or stereo system with the microphone pointing to the sound source while the

90 degree file should be used in a surround sound environment with the microphone pointing

upwards. These two original calibration files can also be found in the CD directory

“\Microphone Frequency Compensation File”. Their file names are something like

xxxxxxx.txt and xxxxxxx_90deg.txt where xxxxxxx is the serial no. labelled on the

Umik-1 microphone body.

Some Windows versions / editions come with some audio signal enhancement features which

are enabled by default. These features must be disabled through the Sound Recording Control

under Windows Control Panel to prevent them from altering the originally sampled data, as

shown below. One of the possible problems caused by these features is the unwanted

alteration of the frequency response of the setup.

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1.7 Twenty Most Frequently Used Measurement Settings

Multi-Instrument bundled with VT RTA-168 comes with many pre-configured panel setting

files. This saves you time to configure various parameters for some frequently performed

measurements by yourself. You can load these panel setting files via [Setting]>[Load Panel

Setting]. Furthermore, 20 most frequently used panel setting files are pre-configured in the

Hot Panel Setting Toolbar (The third toolbar from the top). You can load one of them by a

single mouse click. These 20 measurement settings are:

(1) Home: Default Setting

The factory default panel setting. It is equivalent to the [File]>[New] command.

(2) OCT1: 1/1 Octave Analysis (Avg. 10)

Pink noise will be generated by pressing the start button of the Signal Generator. The pink

noise will be injected into the DUT (Device Under Test), and the response of the DUT will

be captured and analyzed by the Oscilloscope and Spectrum Analyzer. A flat curve in the

Spectrum Analyzer would indicate a flat magnitude frequency response of the DUT. The

equivalent continuous sound level in dB will be displayed in the Multimeter window.

(3) OCT3: 1/3 Octave Analysis (Avg. 10)

Same as OCT1, but with a finer frequency resolution.

(4) OCT3ppn: 1/3 Octave Analysis

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Same as OCT3, but periodic pink noise instead of ordinary (non-periodic) pink noise is used

as the stimulus. One advantage of using periodic pink noise is that its spectrum is ideally flat

under octave analysis even without inter-frame averaging.

(5) Polarity: Speaker, Microphone, Amplifier Polarity Tester with Crest Factor Check

A polarity test signal will be generated by pressing the start button of the Signal Generator.

Point the microphone close to the center of the speaker under test along its axis, and observe

the polarity of the captured pulse in the oscilloscope window. If the pulse goes positive

initially, then the polarity of the speaker under test is positive, and vice versa.

Positive Negative

(6) THD: THD,THD+N,SNR,SINAD,Noise Level, ENOB (Avg. 10 )

A 1 kHz (to be precise, a frequency very close to 1 kHz) sine wave will be generated by

pressing the start button of the Signal Generator. The sine wave will be injected into the DUT

(Device Under Test), and the response of the DUT will be captured and analyzed by the

Oscilloscope and Spectrum Analyzer. All the above parameters of the DUT will be measured

and displayed. This panel setting should be used only if the same sound card is used for

signal input and output.

(7) THDcd: THD,THD+N,SNR,SINAD,Noise Level, ENOB (Avg. 10 )

A 1 kHz sine wave will be generated by pressing the start button of the Signal Generator. The

sine wave will be injected into the DUT (Device Under Test), and the response of the DUT

will be captured and analyzed by the Oscilloscope and Spectrum Analyzer. All the above

parameters of the DUT will be measured and displayed. This panel setting should be used if

different sound cards are used for signal input and output, such as the case of RTA-168. It

should also be used if the 1 kHz test tone is played from an audio CD or a memory stick.

(8) IMDsmp: IMD SMPTE (60 Hz + 7 kHz, 4:1) (Avg. 10)

A 60 Hz and a 7 kHz sine waves mixed at an amplitude ratio of 4:1 will be generated by

pressing the start button of the Signal Generator. The mixed signals will be injected into the

DUT (Device Under Test), and the response of the DUT will be captured and analyzed by the

Oscilloscope and Spectrum Analyzer. The SMPTE IMD value of the DUT will be measured

and displayed.

(9) IMDdin: IMD DIN (250 Hz + 8 kHz, 4:1) (Avg. 10)

A 250 Hz and a 8 kHz sine waves mixed at an amplitude ratio of 4:1 will be generated by

pressing the start button of the Signal Generator. The mixed signal will be injected into the

DUT (Device Under Test), and the response of the DUT will be captured and analyzed by the

Oscilloscope and Spectrum Analyzer. The DIN IMD value of the DUT will be measured and

displayed.

(10)IMDccif: IMD CCIF2 (19 kHz + 20 kHz, 1:1) (Avg. 10)

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A 19 kHz and a 20 kHz sine waves mixed at an amplitude ratio of 1:1 will be generated by

pressing the start button of the Signal Generator. The mixed signal will be injected into the

DUT (Device Under Test), and the response of the DUT will be captured and analyzed by the

Oscilloscope and Spectrum Analyzer. The CCIF2 IMD value of the DUT will be measured

and displayed.

(11)FRwhite: Magnitude Frequency Response (White Noise, Avg. 30)

White noise will be generated by pressing the start button of the Signal Generator. The white

noise will be injected into the DUT (Device Under Test), and the response of the DUT will

be captured and analyzed by the Oscilloscope and Spectrum Analyzer. The curve in the

Spectrum Analyzer indicates the magnitude frequency response of the DUT.

(12)FRpwn: Magnitude Frequency Response (Periodic White Noise)

Periodic white noise will be generated by pressing the start button of the Signal Generator.

The periodic white noise will be injected into the DUT (Device Under Test), and the

response of the DUT will be captured and analyzed by the Oscilloscope and Spectrum

Analyzer. The curve in the Spectrum Analyzer indicates the magnitude frequency response

of the DUT. One advantage of using periodic white noise is that its spectrum is ideally flat

even without inter-frame averaging.

(13)FRswLin: Magnitude Frequency Response (Frequency Sweep, Linear)

A 0.68266667-second 20Hz-to-20kHz linear frequency swept sine wave will be generated by

pressing the start button of the Signal Generator. The signal will be injected into the DUT

(Device Under Test), and the response of the DUT will be captured by the Oscilloscope and

Spectrum Analyzer. The curve in the Spectrum Analyzer indicates the magnitude frequency

response of the DUT. Note that you will need to adjust the trigger level so that the

Oscilloscope will be triggered just upon the start of the sweep.

(14)FRswLog: Magnitude Frequency Response (Frequency Sweep, Log)

A 0.68266667-second 20Hz-to-20kHz logarithmic frequency swept sine wave will be

generated by pressing the start button of the Signal Generator. The signal will be injected into

the DUT (Device Under Test), and the response of the DUT will be captured by the

Oscilloscope and Spectrum Analyzer. The curve in the Spectrum Analyzer indicates the

magnitude frequency response of the DUT. Note that you will need to adjust the trigger level

so that the Oscilloscope will be triggered just upon the start of the sweep.

(15)FRmt: Magnitude Frequency Response (MultiTone, 31 1/3 Octave Bands)

A multitone consists of 31 1/3 octave band center frequencies from 20 Hz to 20kHz will be

generated by pressing the start button of the Signal Generator. The signal will be injected into

the DUT (Device Under Test), and the response of the DUT will be captured by the

Oscilloscope and Spectrum Analyzer. The curve in the Spectrum Analyzer indicates the

magnitude frequency response of the DUT.

(16)sLeq: Short Equivalent Continuous Sound Level (Short Leq, 125ms)

This panel setting will display the short equivalent continuous sound level. The value is time-

averaged over continuous 125 ms.

(17)sLeqA: Short Equivalent Continuous Sound Level (Short Leq, 125ms) (A-Weighted)

This panel setting will display the A-weighted short equivalent continuous sound level. The

value is time-averaged over continuous 125 ms.

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(18)sLeqC: Short Equivalent Continuous Sound Level (Short Leq, 125ms) (C-Weighted)

This panel setting will display the C-weighted short equivalent continuous sound level. The

value is time-averaged over continuous 125 ms.

(19)OCT1spl: 1/1 Octave Analysis (Avg. 10) in SPL

Same as OCT1, but with the Y axis displayed in dBSPL instead of dBFS in Spectrum

Analyzer.

(20)OCT3spl: 1/3 Octave Analysis (Avg. 10) in SPL

Same as OCT3, but with the Y axis displayed in dBSPL instead of dBFS in Spectrum

Analyzer.

1.8 More Acoustic Analysis Functions Available in Multi-

Instrument Pro or Above

Multi-Instrument is very versatile and supports a comprehensive set of acoustic

measurements. To highlight a few not mentioned in the previous sections: Reverberation

(including RT60), Speech Intelligibility (including STI), ANSI / CEA-2010 Subwoofer Peak

SPL Test, Cumulative Spectral Decay, Speaker Rub & Buzz, Sound Quality (loudness,

loudness level, sharpness, etc.), etc. Some of these functions are only available in Multi-

Instrument Pro or above. Please refer to Multi-Instrument software manual for more details.

1.9 List of Audio Test WAV Files (AudioTestCD.zip)

Track

Description

Length

(second)

Recommended Panel

setting to be used

Pink Noise in Phase (-1dBFS)

298

OCT1 ~ OCT24

OCT1spl, OCT3spl

Pink Noise out of Phase (-1dBFS)

298

White Noise in Phase (-1dBFS)

298

FRwhite

White Noise out of Phase (-1dBFS)

298

Log Sweep 20Hz~20kHz (-1dBFS)

Log Sweep 20Hz~20kHz out of Phase (-1dBFS)

Linear Sweep 20Hz~20kHz (-1dBFS)

Linear Sweep 20Hz~20kHz out of Phase (-1dBFS)

Log Sweep 20Hz~200Hz (-1dBFS)

Log Sweep 20Hz~200Hz out of Phase (-1dBFS)

Linear Sweep 20Hz~200Hz (-1dBFS)

Linear Sweep 20Hz~200Hz out of Phase (-1dBFS)

Log Sweep 2kHz~20kHz (-1dBFS)

Log Sweep 2kHz~20kHz out of Phase (-1dBFS)

Linear Sweep 2kHz~20kHz (-1dBFS)

Linear Sweep 2kHz~20kHz out of Phase (-1dBFS)

Log Sweep 20Hz~20kHz (-1dBFS)

0.683

FRswlog

Log Sweep 20Hz~20kHz out of Phase (-1dBFS)

2.73

Linear Sweep 20Hz~20kHz (-1dBFS)

0.683

FRswlin

Linear Sweep 20Hz~20kHz out of Phase (-1dBFS)

2.73

MultiTone32Octave1/3 in Phase (-1dBFS)

FRmt

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