Skip to content
QA401 Audio Analyzer
QA150 High Side Current Sense Amp
QA460 Transducer Driver
QA351 uV DC Voltmeter
QA451 Programmable 8/4 Ohm Load
QA490 In-Ear Monitor Tester
QA471 Low Noise Mic Pre-amp
QA480 1 kHz Oscillator + Notch
Recent Blog Posts
Audio over IP
October 23, 2020
There are several ways to move many channels of audio over a hundred meters. Most familiar to any that have worked in live sound is the humble audi...
Using the QA451 with External Loads
October 18, 2020
Post by Matt One drawback of the QA450 was the fact that when the loads were disconnected, the output was muted. That changed on the QA451, and the...
Preview: QA440 Multimode Relay
September 19, 2020
The QA440 Multimode Relay provides 5-general purpose DPDT relays, accessible through two front-panel DB25 connectors wired in a Tascam DB25 audio p...
Introducing the QA490
August 10, 2020
This week we begin shipping the QA490, which is a companion product for the QA401. The QA490 is for those that need to compare In-ear Monitors (IEM...
Introducing The QA480
July 22, 2020
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
July 22, 2020
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
May 28, 2020
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
April 02, 2020
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
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...
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...
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...
NAMM 2020 and Speaker Compression
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...