For over 25 years, Unison Research and Opera Loudspeakers–both made by the Nasta family in Treviso, Italy–have provided beautiful audio products that will exceed your expectations both sonically and visually. Both of these companies have won a plethora of awards from all over the world for their innovative designs, reliable performance and, of course, their beautiful sound. Colleen Cardas Imports is proud to represent this highly respected marque in the United States.

Colleen Cardas Imports is also the US distributor and importer of PureAudio of New Zealand. Headed by Gary Morrison and Ross Stevens, the duo who were responsible for Plinius’ most successful designs. PureAudio offers true Class A operation, dual mono construction on all its models and innovative and durable construction. This beautiful gear designed to last for many decades, and we are proud to represent it. Please check out the PureAudio website for more information.

We are proud to introduce the incredible Axis VoiceBox S from Australia. John Reilly and Brad Serhan, two of Australia’s most famous speaker designers, put their friendly rivalry aside to produce this amazing studio monitor. The VoiceBox S is the studio monitor of choice for Benchmark Mastering in Australia, and one listen to this accurate and engaging speaker will convince you why. Find out more at the Axis VoiceBox website at

Colleen Cardas Imports is proud to announce that we are now the exclusive US distributors and importers of REDGUM Audio of Australia! REDGUM has been specializing in high-current amplification for over 20 years, and currently features an entire line of amplifiers, CD players, interconnects and more. Known for their beautiful faceplates made from the native redgum tree, as well as the novel “key” that must be turned to power on, REDGUM, led by Ian Robinson and Lindy Gerber, is now focusing on their new Black Series of integrated amplifiers that can power almost any speaker–even those that have impedances of less than 2 Ohms. We are very happy to partner with Ian and Lindy to promote DOWN UNDER AUDIO!

As of June 2016, we are now the US importers and distributors of our other Down Under Audio brands. Les Davis Audio features constrained layer damping devices that improve the sound of most audio systems for a very reasonable cost. Brigadiers Audio builds bespoke loudspeakers with custom Australian veneers and the finest drivers and materials. The Wand Tonearm from New Zealand offers and extraordinary level of engineering for a surprisingly reasonable cost–you can afford a “superarm” for your turntable! We will add more info on these three brands in the near future, but contact us if you have a specific question.

If you’re a dealer or manufacturer and you are interested in more information on Colleen Cardas Imports and our brands, please give us a call at (970) 275-9086 or (541) 260-2485 for more information about Unison Research, Opera, PureAudio, Axis, REDGUM, Les Davis Audio, Brigadiers Audio and The Wand Tonearm. Our email addresses are and If you are a retail customer who wants to know more about our brands, please contact your nearest authorized dealer listed on the DEALERS page on this website. Unless you need to be directed to a specific dealer, we do not usually deal directly with retail customers.


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