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Siegfried Linkwitz was a rare combination of music lover who could hear analytically, and an engineer who could design, measure and interpret the performance of loudspeakers. He contributed much more than his well known crossover topology. He created novel loudspeaker designs and candidly reported on their performance in objective and subjective terms. He respected the scientific method.

NWAA Labs is an independent laboratory providing uniform loudspeaker testing and material testing to the audio, acoustics, and construction industries. NWAA Labs has the unique ability to do MACH™ Testing of speakers and diffusers at a default 5 degree spherical resolution. We also perform measurements of acoustical materials to meet or exceed the frequency range required by ISO and ASTM standards.

Celebrating 50+ years of recording studios, mixing and mastering studios, killer discos, small corner bars, hotel meeting rooms and ballrooms, houses of worship both large and small, home theater surround sound systems, pristine audiophile 2-channel systems, and even radio & TV stations! Sounddoctor is the world expert in subwoofer integration, with over 13,000 tech support cases.

Terminology of a "Quarter Wavelength Loudspeaker Design" is used to describe the content of the articles contained in this website.

AudioCheck gives you access to an extensive collection of sound tests, like ASC's MATT test, playable online and downloadable in high-quality for patrons. The audio material provided here will help you assess the audio equipment connected to your computer.