What separates the men from the boys in the world of measurement systems is the mental horsepower behind the product development and the willingness of the team to share the research and learning involved.

The caliber of research behind CLIO’s long history is second to none. Audiomatica is a small company that adjusts quickly to customer needs while pursuing the same passion for excellence in audio that brought you to this website. Enjoy.

This is your last chance. After this, there is no turning back. You take the blue pill -- the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill -- you stay in Wonderland and I show you how deep the rabbit hole goes. - Morpheus

Morpheus Image

Audiomatica's Knowledge Base is a continually updated source of research and application surrounding CLIO from its beginnings. You will find Application Notes, Technical Notes, Papers and Presentations and a few miscellaneous items on this page. After familiarizing yourself with CLIO's operation and owners manual, this is where you want to go next to further explore CLIO's capabilities and the science behind it. The Application Briefs page covers some of the more recent work that eventually finds its way into the Knowledge Base once formalized.


AN-001 covers the electrical specifications to be considered when selecting microphone cabling for a given source-receiver interface. Included with this application note is an Interface Transfer Function Calculator in Excel format to solidify the concepts presented and allow "what if" scenarios to be executed prior to making setup or purchase decisions.

AN-002 is a thorough introduction to CLIO's multifaceted techniques to detect and analyze distortion. A central purpose of this application note is to aid the user in making good measurements that avoid compromising the accuracy of acquired data.

VN-001 introduces the concepts and procedures involved with correctly removing the time-of-flight delay from a measurement.

VN-002 is Part I of the concepts and procedures involved with making accurate classical THD measurements.

VN-003 is Part II of the concepts and procedures involved with making accurate classical THD measurements.

VN-004 demonstrates how gain structure and the resulting signal to noise influences the quality of our measurements.

VN-005 introduces voltage division concepts behind the passive component measurement of resistors.

VN-006 concludes our passive component measurement discussion with capacitors and inductors.

VN-007 covers the concept of linearity in loudspeaker driver and system impedance measurements.


SynAudCon is by far the undisputed leader in the field of audio education. In my strong opinion, the most ground breaking, even history making learning events ever held in our industry were done under the auspices of SynAudCon with Don and Carolyn Davis - and now Pat and Brenda Brown. Personally, when Don and Carolyn retired I thought it would be impossible for SAC to continue functioning anywhere near its former level of glory, but I was wrong. Pat and Brenda, amazingly, are even better and now you have the opportunity to take advantage of their gifts. One such gift is something else I didn't think possible - online training that actually works. I also strongly recommend doing what it takes financially and time-wise to attend every one of their live classes and workshops - especially if it covers a topic that you don't think you're interested in. I speak from personal experience on this - they are that good.

This is HUGE - as of 11 Aug 2016 the Audio Engineering Society dropped its $145 annual fee for electronic access to the deepest single repository of audio knowledge in the world now that Dick Heyser is gone; its E-Library. Fully searchable access is now included as part of membership in any capacity, full, associate or student. I gladly paid that fee in the past and would have continued doing so indefinitely - the E-Library is a paradise for the mind. This is a gift not to be missed - join!


Transfer-Function Measurement with Sweeps, Director’s Cut Including Previously Unreleased Material
Swen Müller and Paulo Massarani, originally published in the June 2001 JAES
There have been debates over the years about the "desert island microphone", i.e. if you were forced to choose only one microphone to use for everything, which would it be? Ladies and gentlemen, this is the "desert island stimulus paper". It is the single finest overview of stimulus selection for impulse response measurement I’m aware of. BTW, the stimulus type that "lost" in the comparison did so largely because it was the least robust in coping with variations of linearity and time invariance in the DUT. Question: what if you had a situation where you were specifically interested in detecting variations in LTI, such as driver rub and buzz? This is one reason Audiomatica still offers the MLS stimulus in its LogChirp module.

Issues in Loudspeaker Design
Siegfried Linkwitz, ongoing
Linkwitz’s contributions to measurement and loudspeaker design are too numerous to mention and this link will give you a nice distillation of his philosophy on the latter. Regarding the former, his early work with shaped tone burst testing was a breakthrough that led others such as the great Don Keele to further expand on the work that found its way into CLIO’s implementation of the Sinusoidal module and CEA 2010 test.