Blog Entries

Introducing The QA480

Introducing The QA480

by site admin
Post by Matt, July 2020 The QA480 will be a limited-run (~25 units) product for those doing hard-core R&D testing on advanced products that are...
Introducing the QA451

Introducing the QA451

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This week we begin shipping the QA451. The QA451 replaces the QA450 programmable load. When combined with the QA401, the QA450 and QA451 products m...
Automated Testing of In-Ear Monitors

Automated Testing of In-Ear Monitors

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The next few months will reveal another round of accessory products for the QA401. Next up is a tester for In Ear Monitors (IEMs) called the QA490....
Measuring Input Impedance

Measuring Input Impedance

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For some circuits, it's easy to determine the input impedance. For example, take a look at the simplified input stage of the QA460 Transducer drive...
Mic Testing with the QA401

Mic Testing with the QA401

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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...
Mic Compression

Mic Compression

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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...
Notch Filters

Notch Filters

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Notch filters have always played an important role in measurements. In fact, before higher performance ADC and DACs were available, distortion meas...
NAMM 2020 and Speaker Compression

NAMM 2020 and Speaker Compression

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[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...
Automating Pedal Measurements with Tractor

Automating Pedal Measurements with Tractor

by site admin
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...
Cloud Database

Cloud Database

by site admin
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...
Speaker Impedance Measurements

Speaker Impedance Measurements

by site admin
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 ...
Rub and Buzz

Rub and Buzz

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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...