Acoustics 201 : Loudspeaker measurements | Tanasescu Marius | Skillshare

Acoustics 201 : Loudspeaker measurements

Tanasescu Marius, Owner of audiojudgement.com

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38 Videos (3h 28m)
    • 0 - Introduction

      2:19
    • 1.1 - Contents

      3:20
    • 1.2 - Equipment

      6:34
    • 1.3 - Software pick

      3:36
    • 2.1 - UMIK-1 wiring diagram

      2:08
    • 2.2 - Dayton Audio wiring diagram

      2:33
    • 2.3 - Calibration file

      5:33
    • 2.4 - UMIK-1 Room EQ Wizard setup

      5:09
    • 2.5 - Dayton Audio Room EQ Wizard setup

      2:52
    • 3.1 - Types of measurement and Far field in detail

      7:42
    • 3.2 - Near field measurement

      4:19
    • 3.3 - Half space and ground plane

      2:12
    • 4.1 - 2-way speaker measurement | Presenting the setup

      4:27
    • 4.2 - Measuring distances

      1:48
    • 4.3 - Far field midbass

      7:27
    • 4.4 - Far field tweeter

      2:48
    • 4.5 - Near field midbass

      3:29
    • 4.6 - Near field port

      2:00
    • 4.7 - Error, heads up!

      2:34
    • 4.8 - Combine midbass + port

      3:07
    • 4.9 - Box diffraction for near field measurement

      5:12
    • 4.10 - Splice near field with far field

      4:04
    • 4.11 - Create FRD files

      1:57
    • 5.1 - 3-way speaker measurement | Presenting the setup

      2:24
    • 5.2 - Describing the measurement process

      7:12
    • 5.3 - Raw speaker measurements

      9:39
    • 5.4 - Processing of the measurements

      18:37
    • 6.1 - Speaker full frequency response - anechoic

      11:47
    • 6.2 - Speaker full frequency response - at listening position

      11:37
    • 6.3 - Distortion measurements

      10:47
    • 7.1 - Presenting DATS v2

      2:48
    • 7.2 - How to measure the Thiele / Small parameters

      13:00
    • 7.3 - How to create ZMA files

      5:17
    • 7.4 - Measure electrical components

      4:33
    • 8.1 - XSim presentation

      7:33
    • 8.2 - Acoustical offset - measurements

      8:36
    • 8.3 - Acoustical offset - processing of data

      3:52
    • 8.4 - XSim - finishing touches

      3:02

About This Class

Learn how to measure frequency response

The first thing you will learn from this course is to measure the frequency response of a certain speaker driver, loudspeaker or sound system. The difficult part is to get an anechoic response without an anechoic chamber. Using different measuring techniques and with the help of intuitive software, you will learn how to measure the full frequency bandwidth anechoically in your own living room. This will help you set up your audio system using measured data, or it can be used to design crossovers for your particular DIY loudspeaker.

A little bit of electrical engineering

A sound system is a combination of both acoustical and electrical parts. You will also learn how to measure impedance and create impedance plots. Measure different electrical components like capacitors, inductors and resistors. Also, if you have an unknown speaker driver you will learn how to measure the Thiele / Small parameters without much fuss.

Dip your feet into crossover design

While this course will not teach you how to design a crossover, it will show you how to create FRD and ZMA files. These are frequency response and impedance files which are used in crossover design apps. At the end of the course I will show you how to load these files into such program, and tryout different circuits and see how adding crossover components behave. A comprehensive course about crossovers will be released in the near future.

Do I need certain equipment?

Yes, you will need 2 core pieces of gear :

  • A measurement microphone (like miniDSP UMIK-1).
  • A device for measuring impedance (like Dayton Audio DATS v2).

These are roughly 100$ each, but you will get a more comprehensive list of the equipment needed inside the course. With alternatives that you can buy, or more cheaper options. Also, some accessories that will make your life easier are included in the list.

Software option

For the different acoustical measurements we are going to use Room EQ Wizard (or REW). This is a free to use software. Usually, acoustics software are quite expensive and difficult to follow. However, REW is free and quite intuitive to use. Pretty much a complete package. It only misses one function, which I consider important. Don't worry, we're are not going to step up to those complicated application. I devised an Excel spreadsheet which handles this shortcoming. You will find the spreadsheet inside the course.

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Tanasescu Marius

Owner of audiojudgement.com

Hi! My name is Marius and I'm from Romania. I majored in economics and computer science, and have a college and masters degree in this field. Regarding the audiophile part of me, I started to intensely study this area since several years ago. It's difficult to get a college degree in this field, since there are only a few universities around the world which have this specialization (from what I know, In Europe, there is a famous one in Denmark, and another in UK). The closest specialization w...

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