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Old 3rd August 2015, 08:31 PM   #1
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Default How to measure loudspeaker performance best?

Hi,

my name is Daniel and Im from Germany

Id like to explore how I can capture the performance of speakers with measurements the best way, i.e. the most precise and complete way.

First of I hope to be in the most suitable category of this Form ^.^

Regarding the topic I feel like it would be the best to at first collect all possibilities to measure a speaker. (?)

Coming to my mind(edited):

- Frequency Response
- On Axis and on Angles
- Distortion
- Group Delay
- Waterfall
- Phase
- Maximum output SPL versus frequency
- SPL depending on inputvoltage (compression? distortion?)

The next step would be to get deeper insight in what this is exactly telling me.

For example I have good understanding of what the frequency response tells me but lack knowledge about different kind of distortion tests. (harmonic, intermodulation,...)

My current measurementequitment consist out of a calibrated ECM8000 + Interface and an Arta measurementbox.

Id highly appreciate anyone who can give any Input.
(Interest himself, links to good articles,...)

Kind regarts

Last edited by Deconstructor; 5th August 2015 at 07:19 PM.
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Old 4th August 2015, 02:42 PM   #2
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Check out Audio Precision : High Performance Audio Analyzer & Audio Test Instruments, the audio.tst under service & support. I am sure you find a lot of info at the Bruel & Kjaer site, look for their application notes (#15-090 for example). E
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Old 4th August 2015, 03:37 PM   #3
arnyk is offline arnyk  United States
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Can't Arta already do many of those things?

Also check out:

Holme Impulse.

Room Eq Wizard
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Old 4th August 2015, 03:40 PM   #4
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Maximum output SPL versus frequency.
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Old 4th August 2015, 03:49 PM   #5
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Thank you mickeymoose. Ill check the material later

@arnyk: Its not only a matter of finding a software that can do the measurements.
It is also important to know what they mean and how to do them correctly.
I knew REW and Arta, Holme Response however is new to me, Ill check that! Tanks

@Keruskerfuerst: Good point. Maximum SPL determined by? THD?
Also Id like to now how to actually get absolute SPL ratings.
Is a simple SPL meter realy enough?

Greetings
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Old 4th August 2015, 04:09 PM   #6
Zoran is offline Zoran  Serbia
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Location: Belgrade
For home listening with lower power drives
1. White noise FFT with listen position area. each box + stereo. (ElectroAcousticToolBox software.)
2. Minimum phase response. each box + stereo. (FuzzMeasurePro software.)
.
(other useful soft for mac users are Smaart V7 and REW 5)
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Last edited by Zoran; 4th August 2015 at 04:13 PM.
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Old 4th August 2015, 05:07 PM   #7
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Maximum SPL versus frequency means:
measure the frequency response depending on the preset SPL.

Maybe the maximum SPL is limited the distortion or maximum cone excursion.
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Old 4th August 2015, 05:36 PM   #8
arnyk is offline arnyk  United States
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Quote:
Originally Posted by Deconstructor View Post
Thank you mickeymoose. Ill check the material later

@arnyk: Its not only a matter of finding a software that can do the measurements.
It is also important to know what they mean and how to do them correctly.
I knew REW and Arta, Holme Response however is new to me, Ill check that! Tanks

@Keruskerfuerst: Good point. Maximum SPL determined by? THD?
Also Id like to now how to actually get absolute SPL ratings.
Is a simple SPL meter realy enough?

Greetings
There is a documentation or help file that is on the Holme website that has extensive tutorial content.
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Old 5th August 2015, 06:59 PM   #9
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@Zoran: Frequency Response and Phase are already captured in the intro post. It seems quite obvious to me to optimise those parameters to your actual listeing enviroment if you can. (You cant if youre a developer for instance.)

Id apreciate if you could give some insight in what you think Phase can tell us. Or: Why is it even important?

Also: What is our goal? Best combined response? Best response of 1 speaker at time? Whats up with Phase; whats our Goal?

@Keruskerfuerst: I think I missunderstood you initially.
So you want to measure SPL with different inputvoltages?
Checking for? Distortion and compression?
Were is the difference in distortion limited and excursion limited SPL?
Istnt overexcursioning causing distortion so it doesnt matter? xD

@arnyk: Ill check that

Im a bit in a hurry all the time, exams are coming Will be better soon

Great Input so far! Thank you everyone! (I know why I asked here at DIY-Audio )
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Old 5th August 2015, 07:12 PM   #10
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Quote:
So you want to measure SPL with different inputvoltages?
Checking for? Distortion and compression?
Were is the difference in distortion limited and excursion limited SPL?
Istnt overexcursioning causing distortion so it doesnt matter? xD
Measure the frequency response depending on the input voltage.
Check for compression or distortion.
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