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  1. René - Acculution.com

    Loudspeaker Drivers and Gravity

    I was recently asked what the effect of mounting drivers vertically (planar with the floor) versus traditional mounting with the driver axis pointing towards the listener. The former is for example the case for the BeoLab5: In both cases gravity will inevitably act on the driver, and if a...
  2. René - Acculution.com

    Topology Optimized Tweeter Phase Plug

    - Introduction - A study has been made combining acoustic simulations and topology optimization with a target of altering the horizontal directivity of a tweeter via adding a phase plug in front of it. This is a very complex setup as a single phase plug geometry needs to be found that across a...
  3. René - Acculution.com

    Which way is up? (Which way does a loudspeaker driver move?)

    In a recent video by PS Audio/Paul, he mentions the sentiment that many probably share with him, that a loudspeaker driver works by compressing air as it moves outwards. This illustrates perfectly that you can work with loudspeakers for decades without ever understanding how a loudspeaker...
  4. René - Acculution.com

    Phase delay vs group delay: Common misconceptions

    As I see this being illustrated incorrectly very often, I will post here an example of how the phase delay and the group delay of a system affect the output of a system in each their own way. What I see done most often is a reference/input signal is being 'shifted in phase' along a time axis...
  5. René - Acculution.com

    audioXpress article topic suggestions

    Hi all, As I have just started writing guest articles for audioXpress, which has 52,000 readers represented via engineers, DIY'ers, and loudspeaker enthusiasts in general, I would to hear if there are any topics that you would like me to tackle. My focus is modelling and simulation of physical...
  6. René - Acculution.com

    Simulation Overview of the 'Double Bass Array' Configuration.

    I will give a short introduction via simulations in COMSOL Multiphysics to the ‘Double Array Bass’ subwoofer setup and how the response will differ between an idealized situation of two walls moving compared to having a finite number of subwoofers. Imagine first a 3x4x5 meters room. We can...
  7. René - Acculution.com

    Loudspeaker Phase: A Video Lecture.

    Hi all, I recently did a 4+ hours video on all things loudspeaker phase. Feel free to have a watch. - About me - René Christensen, Denmark, BSEE, MSc (Physics), PhD (Microacoustics), FEM and BEM simulations specialist in/for loudspeaker, hearing aid, and consultancy companies. Own company...
  8. René - Acculution.com

    Analytical Analysis - Polarity vs Phase

    - Introduction – The effect of a polarity flip is described in many blog posts and videos as being ‘different’ from a phase shift, with the main argument being that “since a phase shift is equivalent to a time delay, it cannot equate a polarity flip”, or something to that effect. We will show...
  9. René - Acculution.com

    Analytical Analysis - Displacement vs Sound Pressure

    - Introduction - In a recent interview with Erin of ErinsAudioCorner (https://www.audiosciencereview.com/forum/index.php?threads/improving-the-loudspeaker-through-simulations-with-rene-christensen-of-acculution.28103/), I showed that for steady-state conditions, a loudspeaker moving outwards...
  10. René - Acculution.com

    Cables... Can you hear them

    I just skimmed through a new AES paper regarding audibility of interconnects, and though I am not really that invested in cable discussions and psykoacoustics, I thought it might be interesting to a lot of HiFi enthusiasts. (It is not free to download, and while I have access, I am not allowed...
  11. René - Acculution.com

    Simulation Overview - Loudspeakers Design via Shape and Topology Optimization

    -Introduction- May 20 I will give a presentation on the COMSOL Acoustics Day on state-of-the-art loudspeaker simulation techniques, and I will give ASR readers a little sneak peek here. As always, feel free to ask away in the thread, and I will try and answer as best I can. -Loudspeaker...
  12. René - Acculution.com

    Analytical Analysis - Room Gain

    -Introduction- The term 'room gain' is often seen used when the topic of subwoofers and the low frequency sound reproduction comes up. As I see many explanations that are lacking or incorrect, I thought I might try and clear up the topic once and for all. In all rooms there are so-called...
  13. René - Acculution.com

    Analytical Analysis - Room Gain

    Moved to Room Acoustics thread - please delete this
  14. René - Acculution.com

    Simulation Analysis - Screws in Waveguide

    - Introduction - Erin (of Erin's Audio Corner) has expressed an interest in knowing the influence of screws in waveguides; if they protude from the waveguide, can the sound be affected? I have investigated this issue using a numerical simulation software. This is not an exhaustive analysis, but...
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