Software & Hardware

Audio Cabling Connector Guide

Schematic Audio Cable Connections

Rightmark Measuring Software

RMAA suite is designed for testing quality of analog and digital paths of any audio devices, be it a sound card, an MP3 player, a consumer CD/DVD player or an acoustic set. The results are obtained by playing and recording test signals passed through the tested audio path by means of frequency analysis algorithms. A more common mark is also provided for those unfamiliar with measured technical parameters.

A new version is the result of two years of development by best experts in digital audio. RMAA 6.0 raises the bar of comfort and functionality for spectrum analyzers. That's why it is a program of choice for enthusiasts, professionals, and audio magazines around the world; and some manufacturers are developing new devices with the mandatory testing of their quality in RMAA. In short, the program at the moment is a de-facto standard providing quick and easy measurement of technical parameters, without the need to spend tens of thousands of dollars on specialized measurement systems.

Download RightMark Audio Analyzer  Windows Application

If you can't afford spending thousands of dollars on dedicated test equipment, the Rightmark RMAA might be the solution and it is free!

Using a high quality soundcard it performs noise, THD, IMD measurements to the limits of the soundcards abilities. With the Soundblaster Audigy I am able to resolve noise and distortion products below -90db.

3.5mm stereo TRS to 2x RCA

It's easy to use, you only need 2 cables: Soundcard to Amplifier and back to the Soundcard...

Measurementsom my modified Dynavox TPR-1 with RIAA
Frequency of my Tube Pre-amp

Total Harmonic Distortion (THD) Tube Pre-amp

ARTA Measuring Software

The ARTA Software consists of three programs:
They are tools for audio measurements and analysis in acoustical and communication systems.


is a program for the impulse response measurement, for real-time spectrum analysis and for real-time frequency response measurements. The ARTA program is also a powerful analyzer of gated impulse response, smoothed frequency response (in 1/n-octave bands), step response, impulse response envelope (ETC curve), cumulative spectral decay curve, energy decay in reverberant environments, room acoustical parameters and speech intelligibility measures - STI and RASTI.

Spectrum analyzer window

Download ARTA User Manual [ PDF (size 2645kB) ]


is a program for frequency response measurements with stepped-sine excitation. It offers possibility to measure the frequency response with high dynamic range and with high noise immunity (at least 30 dB higher dynamics than with a Fourier analyzer). Simultaneously with a frequency response measurement the STEPS estimates levels of THD and higher harmonics.

Plot of frequency response, 2nd and 3rd harmonic distortion, measured with stepped-sine.

Download STEPS User Manual [ PDF (size 1075kB) ]


is a program for the loudspeaker impedance measurement and loudspeaker parameters estimation.

LIMP impedance plot

Download LIMP User Manual [ PDF (size 661kB) ]

Download ARTA Installation program for Windows 2000/XP/Vista (size 5660kB)

ARTA Homepage

ARTA Connection circuit

Here's a very useful and simple circuit that, when used with the ARTA LIMP software running on your PC, allows you to easily measure:
  • loudspeaker impedance curves,
  • RLC values of passive components at various frequencies,
  • and TS parameters of loudspeaker drivers.

The PC line-out powers the driver under test via a series resistor of known value. I use a 100 ohm 1% resistor.

The line-in channels act as voltage probes fore and after this resistor, allowing the software to determine voltage variation with frequency, which is used by LIMP to calculate the resistance of the loudspeaker onder test.

  1. Connect the cables between the PC and the jig, the jig and the driver under test.

  2. Calibrate the jig (configure the value of the calibration resistor, set the correct reference channel, set the appropriate input and output devices on your sound card, and adjust the levels so you don't clip the input). When calibrated, the jig should indicate a small difference in channel levels (say 0.1 dB).

  3. If you have a large imbalance (greater than 2 - 3 dB), something is not connected correctly. If you have no imbalance, the output is being looped-back to the input within the sound card .
    Check for the correct input and output settings on your sound card.
  4. Connect the driver

  5. Press the red record button and within seconds (depending of the settings), you should have the impedance curve of the loudspeaker.

Room EQ Wizard

Download Room Equalizer Wizard

REW is free room acoustics analysis software for measuring and analysing room and loudspeaker responses. The audio analysis features of REW help you optimise the acoustics of your listening room, studio or home theater and find the best locations for your speakers, subwoofers and listening position. It includes tools for generating audio test signals; measuring SPL and impedance; measuring frequency and impulse responses; measuring distortion; generating phase, group delay and spectral decay plots, waterfalls, spectrograms and energy-time curves; generating real time analyser (RTA) plots; calculating reverberation times; calculating Thiele-Small parameters; determining the frequencies and decay times of modal resonances; displaying equaliser responses and automatically adjusting the settings of parametric equalisers to counter the effects of room modes and adjust responses to match a target curve.

REW is running under Windows and iOS

  • Often very functionally rich, containing advanced analysis functionality such as phase, harmonic distortion and group delay analysis. This can be useful if you trying to design speakers as well as fixing the acoustical distortions introduced by your room.

  • Cons:
  • Generally not beginner friendly and often complicated to use because of the number of non-room measurement related functions they include
  • Accurate sound pressure level readings require that you calibrate the system using a separate microphone calibrator or sound pressure level (SPL) meter
  • Require that you identify and purchase a suitable soundcard, calibrated measurement microphone, cabling and stand. It can take a lot of research and time to get these things and most of the time you will have to order from multiple suppliers.

  • More about using REW:

CARMA (Computer Aided Room Analyser)

Visit Audionet

CARMA (Computer Aided RooM Analyser) is Audionet’s software for measuring and assessing the acoustical characteristics of listening rooms and the identification and simulation of measures to avoid disruptive effects caused by the room.
It's running under Windows

The Audionet CARMA software makes it possible to locate and correct amplitude variations caused by your loudspeaker and your listening room. Amplitude variations in frequency domain can be corrected with up to 5 equalisers in a graphic environment. The corrected frequency response is immediately processed and shown on the display.

DATS V2 Dayton Audio Test System

Visit Dayton Audio

For speaker driver and loudspeaker system measurement, the DATS is clearly the leader when it comes to very simple to use.
Once the supplied software is installed and the DATS connected to a USB port, you are good to go Be sure to set the windows volume controls as noted in the Quick Start Guide. If you see anomalies in the result such as strange dips, spikes or jagged plots in the results, check the settings. Also, the Quick Start Guide makes a point to wait at least 30 seconds in order to allow the DATS to stabilize.

You will want to calibrate the test leads and the DATS.
Calibration of the leads is done by simply connecting the leads together and calibration of the unit is completed by using the supplied calibration resistor (1k-ohm, 1%). The test result seem to be very dependent of the calibration, so use a multi-meter to measure the calibration resistor and enter the value manually into the software.
The manual indicates that completing calibration of both test leads and the DATS unit is essential in order to ensure accurate loudspeaker measurements.

Product Highlights
• Highly accurate measurement of loudspeaker impedance and T/S parameters
• Easy-to-use, fully-featured measurement software with intuitive interface
• Compact USB measurement module with molded test leads and alligator clips
• Software includes signal generator, scope, and measurement of inductors and capacitors
• Data can be saved to create a driver parameter library or exported to popular box design programs
• New V2 hardware and software simplify setup and eliminate warm-up/cool-down times

Simulation Software Boxsim

Boxsim is one of the most powerful software programs available for simulating HiFi loudspeakers. It is aimed at ambitious amateur loudspeaker builders, on the one hand, who already have fundamental experience of calculating loudspeakers but it is also suitable for beginners who wish to use this program to acquire those skills. In contrast to many other loudspeaker simulation programs, Boxsim also includes its own algorithm for simulating edge diffraction from the baffle (baffle step). As a result, Boxsim is able to simulate a loudspeaker of virtually any proportions based on measurements in a standard environment.

Boxsim is free-of-charge to the user (freeware) and may be passed on to others in its original, unmodified form.

Download BoxSim here...


The simplest configuration for most acoustic measurement purposes is a calibrated USB microphone (miniDSP's UMIK-1 is recommended) and your computer's headphone or HDMI output. An analog measurement microphone (Dayton Audio's EMM-6, for example) will need a suitable interface with a mic preamp and phantom power, such as Steinberg's UR22 MkII or the Focusrite Scarlett Solo.

MiniDSP UMIK-1 measurement microphone

The miniDSP UMIK-1 is a plug-and-play USB calibrated microphone for acoustic measurement of your audio system.

Behringer ECM 8000

The ECM8000's linear frequency response and omni-directional polar pattern allows you to carry out measurement and alignment tasks with minimum hassle and maximum precision, making it a perfect complement to any real-time analyzer. Its rugged construction ensures years of trouble-free use.

  • Precise electret condenser measurement microphone
  • Ultra-linear 15 Hz to 20 kHz frequency response
  • Well-balanced, true omni-directional pattern
  • Phantom powered, +15V to +48V
  • Microphone stand adaptor and windscreen for outdoor measurement included

Behringer MIC500USB Tube Ultragain

Audiophile Vacuum Tube Preamplifier with Preamp Modeling Technology and USB/Audio Interface.
  • High-end pre-amplification for all microphone, instrument and line-level sources. Specifically designed for studio-grade condenser mics
  • Built-in USB/Audio Interface to connect directly to your computer.
  • Hand-selected 12AX7 vacuum tube
  • +48 V phantom power, Phase Reverse switch and 20 dB Pad for utmost flexibility
  • Highly accurate 8-segment LED level meter
  • Balanced inputs and outputs on ¼" TRS and XLR connectors

Samsung Go Mic

I'm using this microphone sinds 2017 and i'm still happy with it...

The mic is a USB class-compliant device, so it needs no drivers. Once selected from within my software (Room EQ Wizard), the mic became the source and appeared as a stereo input, with both channels carrying the same signal. the mic has a fairly flat response, running from 80Hz to 18kHz in cardioid mode, and from 20Hz to 20kHz in omni mode. Used with fairly close sources, no significant background noise was evident. Connection is via a miniature USB cable, and for monitoring there's a 3.5mm stereo mini-jack headphone output on the side of the mic. A three-position slide switch selects between the cardioid and omni patterns, and when in the centre position it gives a cardioid pattern with a 10dB pad. There's no level control on the headphone outlet, but this can usually be set in the recording software.

The maximum SPL handling of 121dB

Visit Samsom Go Mic - Portable USB Condenser Microphone

Focusrite Scarlett Solo

The interface features only two ins: a single XLR microphone input (with the same Focusrite preamps as the rest of the Scarlett line), and a 1/4" input that can serve as either a Hi-Z instrument in or line level input, with the flip of a switch. For the output, you get a front-panel 1/4" stereo headphone jack, and two rear RCA outputs for connecting monitors. The name Solo is truly fitting, as this box gives you just enough I/O to capture a vocalist and instrument (be it keyboard or guitar) simultaneously.

Creative Sound BlasterX G1

The Creative Sound BlasterX G1 is a well-priced option with no-frills design and an easy setup. It can deliver crisp audio recordings, as well as an overall sound signature with expanded spaciousness. The device is compatible with all types of headphones, and it has a dedicated audio mode, plus an extensive software suite of controls for PC or Mac.

The Creative Sound BlasterX G1 is also suitable for amplifying studio headphones.