PURIFI Transducer Technology ApS, Lars Risbo Time/Phase Alignment, Acoustic Center, Lobing etc. Introduction There is widespread confusion regarding the terms phase and time-alignment of loudspeakers. Moreover, the fundamental concepts of latency, delay, phase-delay and group delay are often con... Ushindi Sep 22, 2023 0 8690
PURIFI Transducer Technology ApS, Lars Risbo SPK16 Reference Design SPK16 is a passive 2 way speaker system with a 6.5X-NAA alu cone woofer assisted by two passive radiators on the sides of the box combined with a prototype of the coming PTT 33mm long stroke dome twee... Ushindi May 9, 2023 0 20099
PURIFI ApS Some Speaker Problems That Needed Solving Some time ago we posted on our website a pair of sound demos that we thought were quite instructive. One showed that Doppler distortion was much less audible than an equivalent amount of amplitude modulation, thereby sinking a lot of “masking theory” based audio discourse... Ushindi Oct 14, 2021 0 2161
PURIFI ApS This Thing We Have About Hysteresis Distortion *Read any Purifi interview and someone is sure to mention hysteresis distortion (or iron distortion, same thing). What is it about and how serious is it?* Hysteresis happens in any coil that has a ma... Eigentakt Ushindi Apr 28, 2020 0 2189
PURIFI ApS Low frequency harmonic distortion is almost inaudible. So what’s the point of low distortion drivers? Decades of research has shown that we’re not very sensitive to distortion at bass frequencies. I doubt if anything has happened to our species recently that would change that. Consider the science set... Ushindi Dec 12, 2019 0 1288
PURIFI ApS A fast driver needs a light cone. Or does it? Intuition can play us tricks. Take this simple example: how does a speaker cone move when you try to make it produce a “pulse”? I’m willing to bet quite a few of you will guess it will rapidly move fo... Ushindi Dec 10, 2019 0 2034
PURIFI ApS Doppler distortion vs IMD? Let’s get this out of the way first: Doppler distortion is a form of IMD. This is interesting because IMD in general tends to get little interest on loudspeaker forums, whereas Doppler distortion is o... Eigentakt Ushindi Dec 7, 2019 0 3854
PURIFI ApS Distortion, The Sound That Dare Not Speak Its Name Read any discussion about loudspeakers and you get the impression that distortion as a topic is eagerly avoided. If it is mentioned, it is done sotto voce, implicitly. For instance: “you can’t get goo... Ushindi May 2, 2019 0 2246
