PURIFI Transducer Technology ApS, Lars Risbo What is the Baffle Step? Introduction You are perhaps familiar with the terms baffle step and box diffraction. But what is this exactly? The short story is that a driver mounted on a box will radiate sound uniformly in all di... Mar 25, 2026 0 3137
PURIFI ApS, Bruno Putzeys Discrete Op Amps: When and Why It Actually Matters “Discrete is an old audiophile hobby horse,” said Lars. “It proves nothing. Consider writing a few words.” Yes, precisely. Doing things discretely has no inherent value. The normal procedure is that y... Eigentakt Jun 24, 2025 0 7991
PURIFI Transducer Technology ApS, Lars Risbo The PURIFI Tweeter Project - Part 2 Introduction In Part 1 we learned why we chose touse a hard dome as the radiator: the dome simply yields the best dispersion for a given size. A further advantage of a dome is that has high geometric ... Jan 31, 2025 0 12205
PURIFI Transducer Technology ApS, Lars Risbo The PURIFI Tweeter Project - Part 1 Introduction The tweeter project has been an intensive R&D effort for the last 3 years. Yes, we know, the long waiting time until it is released is painful for all of us. Since we are getting closer, ... Ushindi May 24, 2024 0 18660
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 24083
PURIFI Transducer Technology ApS, Lars Risbo SPK16 Reference Design Note: SPK16 is now released as a kit with build description 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 w... Ushindi May 9, 2023 0 46673
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 8896
PURIFI ApS Combating Hysteresis Distortion (part 1: Amplifiers) Our blog post concerning hysteresis distortion got people asking what secret non-hysteretic material we were using then. What is it about our industry that programs people to look for unobtanium mater... Eigentakt May 13, 2020 0 7285
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 10100
PURIFI ApS Does negative feedback cause TIM? Actually, “TIM” is not so much a type of distortion as a test method to detect Slew Induced Distortion. Nobody calls it that though, and if I need to be pedantic, what we call the animal may not be th... Eigentakt Apr 20, 2020 0 5025
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 8523
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 6304
