Recent Blog Posts

Mic Compression

Mic Compression

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

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

[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

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

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

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

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

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

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

Automating EQ Tests using Masks

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...
Quickly Characterizing A Tone Knob Using Exponential Sweeps

Quickly Characterizing A Tone Knob Using Exponential Sweeps

A quick video to show how quickly a tone knob can be characterized using features that have been introduced in the last few releases. 
QA401 Release 1.760

QA401 Release 1.760

Release 1.76 for the QA401 should be out early next week and features the ability to build and apply masks to acquired data and deliver a pass/fail...