Blog Entries

Mic Testing with the QA401

by site admin March 01, 2020

Last week a post on the forum showed how to make an automated test for microphones that runs in Tractor. Recall Tractor is the standalone program t...

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Mic Compression

by site admin February 17, 2020

We previously looked at the phenomenon of speaker compression, which occurs when increases in gain in the the speaker output fail to track the incr...

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Notch Filters

by site admin February 06, 2020

Notch filters have always played an important role in measurements. In fact, before higher performance ADC and DACs were available, distortion meas...

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NAMM 2020 and Speaker Compression

by site admin January 28, 2020

[Post by Matt] NAMM 2020 has come and gone, and as usual the event was informative and educational. I had an interesting discussion with a person w...

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Automating Pedal Measurements with Tractor

by site admin January 15, 2020

We have a new forum located here. It's based on Discourse, which is a bit different form most forum software. Discourse is optimized for short, qui...

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Cloud Database

by site admin December 04, 2019

Let's say the first 50 units of your new widget prototype have come off the line. You're excited because this is the first time you've built more t...

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Speaker Impedance Measurements

by site admin October 18, 2019

In late 2018 a plug-in was added for making speaker impedance measurements. This post takes a look at additional hardware requirements to be aware ...

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Rub and Buzz

by site admin October 15, 2019

QA401 release version 1.81 (located HERE) adds speaker Rub and Buzz testing in the form of a plug-in. Rub and Buzz refers to a speaker test that ca...

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First Look: Infineon MERUS MA12070

by site admin September 28, 2019

The growing portable speaker segment is resulting in some solid Class D innovation from silicon vendors. A new part from Infineon is especially int...

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Release 1.791 and Portable Speakers

by site admin August 17, 2019

Release 1.791 (located here) has some tools for testing portable speakers & speakers in general. The portable battery-powered speaker segment i...

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Automating EQ Tests using Masks

by site admin July 19, 2019

Release 1.79 is the latest release of the Q401 application (located here) and release 0.981 is the latest release of Tractor (located here). The QA...

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Quickly Characterizing A Tone Knob Using Exponential Sweeps

by site admin July 11, 2019

A quick video to show how quickly a tone knob can be characterized using features that have been introduced in the last few releases.

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