Blog Entries

Automated Testing of In-Ear Monitors

Automated Testing of In-Ear Monitors

by site admin
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

by site admin
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

by site admin
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

by site admin
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

by site admin
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

by site admin
[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

by site admin
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...
First Look: Infineon MERUS MA12070

First Look: Infineon MERUS MA12070

by site admin
The growing portable speaker segment is resulting in some solid Class D innovation from silicon vendors. A new part from Infineon is especially int...
Release 1.791 and Portable Speakers

Release 1.791 and Portable Speakers

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