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Audio measurement tools [message #86024] Sun, 03 September 2017 06:35 Go to next message
bcharlton  is currently offline bcharlton
Messages: 112
Registered: August 2016
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Do you trust the tools that are downloadable for free? I noticed that there are quite a number on the several app stores. Which one do you prefer?
Re: Audio measurement tools [message #86062 is a reply to message #86024 ] Tue, 05 September 2017 02:40 Go to previous messageGo to next message
moss24  is currently offline moss24
Messages: 102
Registered: May 2016
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I would say the tool you choose will depend on the purpose. For instance, an audio designer will use a measurement to evaluate the performance of a particular equipment, whereas a maintenance engineer will be more interested in detecting any defects. The majority of us probably use this for health and safety purposes. I would invest some money to get a good measurement tool.
Re: Audio measurement tools [message #86064 is a reply to message #86062 ] Tue, 05 September 2017 08:52 Go to previous messageGo to next message
Wayne Parham  is currently offline Wayne Parham
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Registered: May 2009
Illuminati (33rd Degree)

I use LMS and WTPro. Neither are free though. Both use specialized hardware.

Re: Audio measurement tools [message #86266 is a reply to message #86024 ] Wed, 04 October 2017 11:23 Go to previous messageGo to next message
mamoss  is currently offline mamoss
Messages: 102
Registered: May 2016
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Haven't heard of good quality stuff being available for free for a long time. I believe that you have to incur some cost in order to get a good tool. I think I've heard of the WTPro. Is it Woofer Tester Pro in full?
Re: Audio measurement tools [message #86273 is a reply to message #86266 ] Wed, 04 October 2017 15:23 Go to previous message
Wayne Parham  is currently offline Wayne Parham
Messages: 16995
Registered: May 2009
Illuminati (33rd Degree)

That's right - WTPro is made by Smith & Larson, the same company that made the original Woofer Tester. But WTPro is much more full-featured, including the ability to make acoustic measurements in addition to the basic electro-mechanical parameter measurements. And the thing I really like about it is the Interactive Crossover Designer.

The ICD provides a mechanism to use a Spice model to create a digital filter. What this does it to allow a designer to enter the Spice model of a passive crossover and then to measure a loudspeaker using this digital representation of the crossover. The benefit is that crossover changes can be realized immediately, during measurements, simply by changing values in the Spice model.

I've done several designs with the ICD and it has proven to be 100% accurate. I am able to "dial-in" my crossovers, fine-tuning the on-axis and polar response using the ICD. When I am happy with the ICD measurements, I then build a physical crossover and measure again. It is an extremely useful design tool.

See a write-up of the ICD design process at the link below. It includes a link to a video where you can see the WTPro in action.
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