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Old 29th September 2013, 05:17 PM   #1
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Default Measuring the SPL of loudspeaker at home.

Recently, I have bought a Dayton Audio UMM-6 USB Measurement Microphone to measure my loudspeaker's SPL (vs freq). I am quite new to this thing.


I have read somewhere that measuring the SPL vs frequency of a loudspeker or a driver fairly acurately is possible at home using a laptop and some software. The software is supposed to measure the effect of the room first and take that into consideration while measuring the SPL of the loudspeaker.

Is such a task possible with True-RTA? How?
Is there a tutorial link somewhere?

How am I supposed to connect the laptop to the speaker? I have a Moon 220i integrated amplifier at home.


I would greatly appreciate any help and info.

Thanks.
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Old 29th September 2013, 05:26 PM   #2
Pano is offline Pano  United States
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HOLMImpulse is a good software to use, and it's free. You can get a lot of help here using it. HOLM should see your USB mic as an input.

You'll need something linear as an output to your speakers. The soundcard line out of your computer may be good enough.
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Old 29th September 2013, 05:55 PM   #3
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Thanks. I found their website:
HOLM Acoustics

So... can I just connect the laptop to the amp using headphone output of the laptop? (Mine is broken and needs fixing! I have to fix it soon. )

How do I figure it out that the amp's output I am using is linear?
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Old 29th September 2013, 06:07 PM   #4
a.wayne is offline a.wayne  United States
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Drag it outside and do ground plane measurements ......
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Old 29th September 2013, 06:18 PM   #5
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The frequency response of your amplifier should be wide enough and flat enough for your measurements. Just make sure that you bypass all of the audio effects in your laptop before running the tests. You won't need much amplifier power either. Follow the directions from the HOLM website.
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Old 29th September 2013, 07:07 PM   #6
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Disclaimer: I am only faintly familiar with True-RTA. But generally, Real-Time Analyzers are NOT set up to window reflections out of a measurement, and so cannot get you the response of only the speaker. You'd also miss narrow notches or peaks in response.

Having said that, you could try it with the speakers outside on top of a high ladder, far from any buildings, and it will give you a decent rough idea of what is going on
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Old 4th October 2013, 05:32 AM   #7
Pano is offline Pano  United States
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Yes, if you can measure outside that's great. Or if not, use the gating feature in HOLM.
You should be able to get good frequency response graphs with that arrangement.
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Old 4th October 2013, 06:06 AM   #8
Juhazi is offline Juhazi  Finland
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Many of us find RoomEQWizard (REW) to be the easiest program for home use. It has many features that help you to understand what is going on in the room too. It's Help files are really informative. You must register to the website to download, free!

For signal output, buy some USB-DAC or use any DAC with USB-in and RCA-out. Laptops's Phones-outs are not linear enough but Line-out or SPDIF-out are.

There are also many tutorial videos of REW https://www.google.fi/#q=rew
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Last edited by Juhazi; 4th October 2013 at 06:11 AM.
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Old 5th October 2013, 12:52 AM   #9
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Thank you guys for all the info.
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Old 5th October 2013, 12:53 AM   #10
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I have a RegaDAC. I try this Holm software with it so if it works.
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