Recent Posts

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1
SpeakerDraft / Re: Dual Speakers
« Last post by Colin Edwards on September 21, 2017, 02:54:59 PM »
I also requested a multiple-driver option for Speaker Draft app shortly after purchasing it, however I found simple a way around the problem, which I believe gives accurate results. 

I Select the driver I plan to use and calculate a cabinet volume with a reflex port for just one driver.
Once I have adjusted values to obtain a suitable curve I then think about the proportions I want the enclosure to have, cube, half cube, truncated pyramid, whatever, as long as the box is double the volume I calculated for it can house two identical drivers and two identical reflex tubes. 

If my design does not work out well or sound as it should I will post again to say so.
2
SoundMeter / Calibrate MicW i437L
« Last post by mgolden on August 28, 2017, 01:10:13 PM »
I hope someone can help.  I just got one of MicW new i437L microphone with a lightning connector. This seems to be a digital microphone which I have not really used before.  The unit comes with a tested sensitivity of 24.8 Pa/FS.  The nominal sensitivity on the datasheet is -27.5dBFS (94dB SPL @ 1kHz).

In the input options of the I/O Configuration I have set the Device Units to "FS" and the Gain at "Mid".  Under Input Channel menu, I have set Units to Pa and entered in the tested sensitivity.

It is the gain setting that I am not sure of.  Changing gain changes the SPL.  Mid seems to give the result that is closest to what I think the measurement should be.

Next time I am near an acoustic calibrator I plan on checking the calibration. 

Thank you in advance.
3
SignalScope / UMM-6
« Last post by CBowers on August 20, 2017, 09:40:36 PM »
Hello,

For some time my Dayton UMM-6 mic has not be prompting to enter the serial number to calibrate and shows up as a generic plug and play mic.
I've seen the help note here suggesting to unplug and replug it a few times, but that doesn't seem to help.
My other mic, the Umic-1 works fine.
I thought perhaps it might have been that I'm using the original USB camera adapter with a 30pin to lighting adaptor.  But that still works fine with the Umik-1 on an iPad Air 2. 
And I see the Umm-6 still behaves that way on an iPad Pro 10.5 with the current USB camera adaptor.
4
Electroacoustics Toolbox / Re: Basic setup guide
« Last post by FaberAST on April 27, 2017, 06:46:29 PM »
Steve,

If you are trying to perform dual-channel measurements (e.g. frequency or impulse response), I would point you to the tutorial on the blog for reference.
Frequency Response Measurement with Electroacoustics Toolbox 3

Why can't you use the output of the Duet to use the built-in test signals? Perhaps, a more detailed description of what you are trying to do, and how you would like to set it up, would help us zero in on a suitable solution.

Ben
5
Electroacoustics Toolbox / Basic setup guide
« Last post by Steve Cole on April 10, 2017, 11:01:08 AM »
Hi All,

I'm wondering if any you could help me please ?

I'm running 3.0.4, but for the life of me I am unable to use the program to test frequency results / SNR etc with various preamps. my sound card is an Apogee Duet. As I'm using the Duets' main outputs for my speakers, I cant 'loop' around using the built in test tones. I can generate the test tones via my Neutrik minirator.

Saying that, I will do whatever I need to get the system working.
Sorry to sound like a proper newbie when it comes to this software, as I'm just used to using hardware not software.

Any help in the matter is greatly appreciated,
Best,
Steve


6
SoundMeter / Re: Feature Request to import Mic Cal. Files
« Last post by aprada on March 15, 2017, 01:12:30 PM »
Please Implement this feature
7
SoundMeter / Re: Interaction of SoundMeter and "made for iPhone" hearing aids
« Last post by FaberAST on January 05, 2017, 12:03:28 PM »
Stuart,

Bluetooth mic input is typically sampled at 8 kHz. The weighting filters in the Meter and the bandpass filters in the Octave analyzer are designed to operate at multiples of 44.1 kHz and 48 kHz, which would explain the "Unsupported Sample Rate" message.

It seems that some time ago Apple changed the behavior of Bluetooth audio in iOS (at least in the Measurement Mode that SoundMeter uses). Since SoundMeter requires both input and output from the audio system, Bluetooth won't work unless you are using a Bluetooth headset (or hearing aids, in your case) with both input and output. Unfortunately, if you use a headset for input and output, then the sample rate will be restricted to 8 kHz (for both input and output).

This is a change from how Bluetooth used to work on iOS, when it was possible to use the built-in mic with Bluetooth output.

I wish I had better news.

Ben
8
SoundMeter / Interaction of SoundMeter and "made for iPhone" hearing aids
« Last post by sbiggar on January 02, 2017, 12:47:52 PM »
I realize my request is not typical and is probably not a real issue but I'm not sure where else to ask.

I've got SoundMeter 8.4.3 (r1594) with the Octave Analyzer option installed on an iPhone 6 Plus running iOS 10.2.  I'm older and use hearing aids (moderate to severe high frequency loss) so I'm interested in sound levels in various environments (like my office with loud air handlers).  Recently I got new "made for iPhone" hearing aids from Oticon (Opn).  The aids connect to the phone using Bluetooth and cell phone calls are routed directly to the hearing aids but the internal iPhone microphone is used for transmitting sound for phone calls.  When the hearing aids are connected, the Octave analyzer will not run.  It issues a message in a white box:  Unsupported Sample Rate The selected input device operates at a sample rate which is not supported for octave band analysis.

The SoundMeter Meter part works fine using the "Bottom microphone" input with or without the hearing aids connected.

I assume that the hearing aid connection has set up the audio sampling hardware in a mode that is incompatible with the analyzer.

I wonder if an external calibrated mic with external A/D and electronics (iTestMic2 for example) would work correctly with SoundMeter and the analyzer option with my hearing aids connected to the phone?

Thanks,

Stuart
9
SoundMeter / Re: Can I use SoundMeter to measure noise via my Windows laptop?
« Last post by FaberAST on March 30, 2016, 10:23:17 AM »
Zoe,

I'm not aware of any affordable sound level meter software for Windows.

You might consider an iPod touch as a less expensive alternative to the iPhone. The accuracy of your measurements will depend on the quality of your calibration, regardless of which device you use. You can get more reliable measurements with an external measurement microphone, like the MicW i436.

Ben
10
SoundMeter / Can I use SoundMeter to measure noise via my Windows laptop?
« Last post by zleo99 on March 21, 2016, 01:39:34 AM »
Please help me: I have a butchery backing onto my flat whose chillers make variable loud noise 24/7 and especially at night.  I would like to be able to monitor the noise myself on a continuous basis, but I don't want to buy an iPhone especially to run SoundMeter; and anyway, "Evaluation of smartphone noise apps"
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4659422/
says the iPhone 5 is not very accurate.
Is there SoundMeter software to use on my Windows laptop??
Many thanks for your help
Zoe
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