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Old 14th July 2012, 07:21 AM   #1
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Default Help in measuring speakers

one of my friends has a "Dayton Audio OmniMic V2 Precision Measurement System" I used it some time now I want my own system. I want your idea about Mic and software... what about Behringer ECM8000? what is the best software for speaker measurement? I want measure T/S and analyze speakers response and sensitivity and so on

Last edited by ARIYAHOOR; 14th July 2012 at 07:23 AM.
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Old 14th July 2012, 10:39 AM   #2
tvrgeek is offline tvrgeek  United States
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#1. When you buy the mic, BY ONE CAIBRATED. I am not kidding.
The ECM8000 is what we all have. You of course need a mic preamp with phantom power. I have M-audio external mic preamp and sound card, one Firewire, one USB. The e-mu 1616m kept crashing. Want one cheap?

I use several tools. Some cost, some free. If I use the free one as part of my standard kit, I make a donation.

Electrical:
I have the older WT-2 for impedance measurement. Great tool. It does everything you need for T/S measurements. I think it is Woofer Tester III now. I would not be without it.

Acoustic:
ARTA is a great package.( free) I am kind of converting to it even though I own the very powerful do everything measure and model everything SoundEasy package.(expensive) I still prefer TrueRTA in the paid 1/24 octave version for bass/box measurements. I know it and it is easy.

Simulation:
The EDGE is quite handy. I model electrical stuff in Spice. WinISL for box design and several spreadsheets of my own for crossovers and unit conversions..

Download the ARTA manual, and the SoundEasy manual. Read all about how to do the measurements before you spend money. ALso, read Joe D'Appolito's book Measuring Loudspeakers. None of this will makes sense unless you learn what you are really measuring.

Did I mention you only want to buy a calibrated mic?

A good lab is not cheap. You will also eventually want an LCR meter and decent DVM. I use a dedicated integrated amp on my bench with a Behringer DCX. I still use an old pulse generator from a kit for measuring time delays and phase offsets. You need a delayed trigger scope to use it. Zelscope sort of does, but I use my old Tek bench scope. I have the old school tools too, HP signal generator, AC voltmeter, counter, etc. e-bay is your friend.

PS: If you don't buy a calibrated mic, you will have to have yours calibrated eventually anyway.
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Old 14th July 2012, 12:02 PM   #3
DrDyna is offline DrDyna  United States
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I have a Blue Icicle mic preamp that provides phantom power, mic preamp and usb output. It seems to work really well and it's fairly inexpensive.

https://www.bluemic.com/icicle/
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Old 14th July 2012, 04:25 PM   #4
tvrgeek is offline tvrgeek  United States
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Yup, those work fine but only for amplitude measurements. You need two channels to do phase measurements. Reading the SoundEasy documentation is the best way to explain it. I don't know of a way to get one channel off one USB and another off the sound card.
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Old 14th July 2012, 05:36 PM   #5
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thanks to all entries
I don't want sell my car to buy a lab... I just want something to work for some years and then maybe I'll get something more accurate
how about Dayton Audio OmniMic V2 Precision Measurement System with about US$300.00? is there any better option at this price?
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Old 14th July 2012, 06:44 PM   #6
tvrgeek is offline tvrgeek  United States
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Please. Download and read what I pointed you to. ARTA is FREE. Spend the few bucks on the good Dr. Joe's book. The only thing expensive is to charge off uninformed and buy the wrong thing.
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Old 15th July 2012, 12:57 AM   #7
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Quote:
Originally Posted by ARIYAHOOR View Post
one of my friends has a "Dayton Audio OmniMic V2 Precision Measurement System" I used it some time now I want my own system. I want your idea about Mic and software... what about Behringer ECM8000? what is the best software for speaker measurement? I want measure T/S and analyze speakers response and sensitivity and so on
I have enough experience measuring loudspeakers and designing crossovers to put in my response here. I suggest you get the following:
  • calbrated microhpone
  • microphone preamp with phantom power
  • measurement software
I use a calibrated Behringer ECM8000 microphone. I have heard some bad things about the blue icicle, so I would avoid. The Behringer mics are very commonly used for DIY loudspeakers. You can purchase one from Parts-Express (the EMM-6, which is just a relabeled ECM8000) or from Cross-Spectrum Labs. You will need a microphone phantom power supply to run these microphones, and it is convenient to get this built into a microphone preamp. I use an M-Audio Firewire 410 (external box connected to my computer via Firewire) for this purpose, which may no longer be a current product, but there are lots of similar products out there. You need to get the signal into your computer, too, which the Firewire410 does, so look for that capability and not just for a mic preamp.

I use the ARTA suite of measurement software extensively (ARTA Home). They offer a free version that does everything you need, but it wouldn't be bad to pay them if you like it. This does everything you will need for making loudspeaker measurements, and I wrote a tutorial about how obtain a quasi-anechoic frequency response using a gated impulse measurement (See: http://audio.claub.net/tutorials/FR%...ing%20ARTA.pdf) since this is an important part of taking measurements. Don't worry about phase measurements - you can just extract the minimum phase from the frequency response. Again, this is pretty standard for loudspeaker measurement and crossover design.

There are several ways to measure T/S parameters, including the LIMP module of ARTA. By far the easiest way to measure T/S parameters is with a "woofer tester". I use the Smith and Larson WT2 version, because it is reliable. There is also a WT3 sold by Parts-Express that is fancier and faster. Both of these allow you to just connect the driver to the computer via a small external box (sold with the product) and take the measurements quickly and easily.

That will get you started. There are certainly a few other things to be learned about loudspeaker measurements, but you need to crawl before you run.

-Charlie

Last edited by CharlieLaub; 15th July 2012 at 01:00 AM.
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Old 15th July 2012, 01:25 AM   #8
Pano is offline Pano  United States
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Ditto the above. The Behringer or Dayton Mic and a USB soundcard. I use M-Audio.
The Dayton Omni mic is nice and the software is very good and is an integrated package. ARTA, as stated is very good and so is HOLMImpulse.

The WT3 is very fast and easy to use for T/S parameters.

That's all you need, really.
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Old 15th July 2012, 02:29 AM   #9
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Although clunky, REW is top notch. Send a donation once you get the hang of it Better than Holm and Arta IMO.
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Old 15th July 2012, 04:47 AM   #10
ScottG is offline ScottG  United States
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1. Dayton Audio DATS Dayton Audio Test System 390-806

You *could* dump DATS.. but practically speaking it's a "no-brainer" for a fast and easy method for obtaining T/S param's with impedance - with the ability to export to a more sophisticated software suite like Soundeasy. The OmniMic won't do this for you.

2. Dayton Audio EMM-6 Electret Measurement Microphone Allows For Accurate Acoustic Measurements At A Fraction Of The Price 390-801
NOTE: once purchased you download the calibration file.

3. Amazon.com: ART USB Dual Pre: Musical Instruments
IF using Windows 7:
ART Pro Audio


Basically 2 & 3 along with "freeware" software nets you your equivalent to the OmniMic, though also has the capability for 2 mics (should you choose to add an additional one). (..note the difference in cost vs. the OmniMic.)


IF it's just speaker measurement then HOLM or ARTA will have you covered for "free".
IF you want speaker design software INTEGRATED then Soundeasy.
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Last edited by ScottG; 15th July 2012 at 05:08 AM.
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