Blog Entries

Using the QA451 with External Loads

Using the QA451 with External Loads

Post by Matt This post is under construction. Please check back. One drawback of the QA450 was the fact that when the loads were disconnected, the ...
Preview: QA440 Multimode Relay

Preview: QA440 Multimode Relay

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

Introducing the QA490

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

Introducing The QA480

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

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

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

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

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

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...