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  1. D

    Power grid interference: What does it look like measured with different tools?

    If you're interested to see what power grid interference looks like, take a look at the videos below, or a comprehensive article about it here: https://rdacoustic.cz/en/blog/2021/04/30/f4sx-audio-power-filter/ (explains in detail what I did here and includes background info + why is it important...
  2. D

    Measuring Power Grid Interference in Practice

    Dear Charles, thank you for your reply. Very important is quality of grounding (PE). I will write an article about it in a while. We have L, N, PE potentials in our grid. Entech "Wideband Powerline Noise Analyzer" (I have something like that from china) - measure only symmetrical...
  3. D

    Measuring Power Grid Interference in Practice

    We measured the high frequency noise in the power grid. The voltage going to the measuring kit is conducted by a common EURO cable and the RD Power Filter in order to compare their efficiency. I have made measurements on four different places for comparison. Read more at...
  4. D

    Interesting article about room acoustic

    Dear Todd, diffusion starts lets say 1/4 wave length from smallest difference of the pattern, lets say 4cm = 8.625 kHz to 1m=345 Hz. David.
  5. D

    Interesting article about room acoustic

    I'd like to share an interesting article with pictures and animations https://www.rdacoustic.cz/en/blog/2019/03/30/acoustics-theory-sound-behaviour-in-closed-space/
  6. Euphoria speakers

    Euphoria speakers

    These unique stereo hifi speakers take advantage of the ideal properties of a full-range driver. They are characterized by their detailed elocution, excellent spatiality and instrument localization. Aside from the full-range driver, the Euphoria speakers are also fitted with a strong, highly...
    • DavidPiska
    • Media item
    • hifi highend loudspeakers rdacoustic spekakers
    • Comments: 1
    • Category: MEMBER SYSTEMS
  7. D

    High End speakers Evolution - full range, back horn

    Dear 16Hz, you are absolutely right. It is not speakers for stadium sound system. Evolution speakers are designed for home listening in reasonable volume up to 110 - 120 dB. I think that reasonable volume is about 85-95 dB. Above this volume level human ear loses sensitivity in details. Absence...
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    High End speakers Evolution - full range, back horn

    link High End speakers Evolution are designed for truthful stereo 2.0 listening. The Evolution speakers are characterized by full details, excellent localization and spaciousness of musical instruments. Evolution speakers contain only one speaker driver with very high sensitivity and unique...
    • DavidPiska
    • Thread
    • back horn speakers full range speakers loadspeakers speakers
    • Replies: 2
    • Forum: Speakers
  9. D

    Euphoria High End speakers - RDacoustic

    http://www.rdacoustic.cz/en/high-end-speakers/high-end-speakers-euphoria/

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