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Old 6th January 2014, 04:16 AM   #1
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Default Comparing REW, ARTA and CLIO in speaker driver and acoustic measurements

I am lucky to have access to a CLIO system (firewire box and CLIO 10 software). This is an expensive tool compared to REW or ARTA plus audio interface. Since high-quality audio interface is relative cheap, together with these low-cost/free software may be able to form a professional measurement system. First, I will do driver impedance and TS parameters using REW and ARTA (LIMP). Obtained results will be compare with CLIO measured data. I will then performance SPL (frequency response) measurment.

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Old 6th January 2014, 05:29 AM   #2
_henry_ is offline _henry_  Australia
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hi panson_hk,

interesting, i would like to see it too. How about comparing to omnimic v2? i think its the current golden standard in DIY speakers

cheers
henry
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Old 6th January 2014, 05:48 AM   #3
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Unfortunately I don't have Omnimic system. But I just ordered a very similar USB mic. This is MiniDSP UMIK-1 for REW and ARTA. I may buy a decent USB audio interface (Presonus) in order to use the CLIO mic with REW and ARTA.
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Old 6th January 2014, 05:59 AM   #4
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A Peerless 2.5" driver is measured. Impedance obtained by REW, LIMP and CLIO are shown in one graph for comparison. 48k was used in all measurements.
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File Type: jpg Peerless driver.JPG (84.4 KB, 327 views)
File Type: jpg P803985 data compare.jpg (52.5 KB, 325 views)
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Old 6th January 2014, 06:54 AM   #5
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I used CLIO to measure the driver again. The result is closer to those of REW and LIMP. All three measurement results are indeed identical.
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File Type: jpg P803985 data compare.jpg (49.5 KB, 320 views)
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Old 6th January 2014, 04:44 PM   #6
RNMarsh is offline RNMarsh  United States
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Good to have these comparisons. What other frequently used tests can you compare ?

THx-RNMarsh
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Old 7th January 2014, 01:48 AM   #7
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TS parameters obtained based on the impedance measurement. Added mass method was used. All software have build-in TS calculator.

Practically, they provided "same" parameters. Let me use them to simulate a sealed box.
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File Type: jpg P803985 TS comparison.jpg (59.4 KB, 294 views)
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Old 7th January 2014, 03:42 AM   #8
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The Peerless (Tymphany) driver is P830985. Data sheet is available from this link http://www.tymphany.com/files/PLS-P830985%20Rev1_0.pdf. The one I have showing a higher fs (149 Hz vs 117 Hz given in spec.). It is a big difference!

CLIO SPL (1W/1m) measurement of my sample is given below. The roll-off agrees with the fs measured.
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File Type: jpg SPL.jpg (47.7 KB, 285 views)

Last edited by panson_hk; 7th January 2014 at 04:10 AM.
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Old 7th January 2014, 04:19 AM   #9
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An update to the last graph to include SPL simulated by Akabak.

A simple Akabak script (sealed box) is as below.

System 'S1'

Def_Driver 'Peerless'
SD=25.967cm2 |Piston
fs=149.3Hz Mms=2.17g Qms=4.45
Bl=2.58Tm Re=3.6ohm Le=31uH ExpoLe=0.618

Driver 'D1' Def='Peerless' Node=1=0=2=3

Enclosure 'E1' Node=2
Vb=877L Qb/fo=0.1 Lb=117cm

Radiator 'Rad1' Def='D1' Node=3
Sd=26.0cm2
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File Type: jpg SPL.jpg (50.1 KB, 107 views)
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Old 7th January 2014, 05:04 PM   #10
1audio is online now 1audio  United States
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The differences you show are well withing the usual repeatability range. The driver may need "break in" to meet the original resonance spec.

The quality of the mike calibration and the ability to bring the cal curve into the software may be more important than the software itself.

What was the acoustic environment you measured in? I have had very good results using ground plane windowed measurements to get anechoic measurements. In a large space (empty warehouse space with at least 50' to the nearest object in my case) I can get to below 20 Hz. Averaging multiple measurements helps remove noise a lot.
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