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Kvalsvoll last won the day on May 6 2019

Kvalsvoll had the most liked content!

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About Kvalsvoll

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    Bass Overlord

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  1. A lot has happened since the last update here. I mainly use facebook to post short messages and pictures of what is going on now, and articles are on my web site in the blog-section, products on the product page. Which means no focus on updating this thread. A new very small speaker has been developed, it was due for launch and presentation, and then you-know-what arrived as a free gift from someone I am not very pleased about at the moment. So launch is now postponed indefinitely, until people are able to show interest in speakers and sound again. The new F205 has a preview pag
  2. This is great, and as you mention - the challenge is how to market sound. The irony is, that it would be easier back in the 80ies - 90ies - before the internet. Today, you are easily lost between all other outstanding and remarkable offerings, and they have a larger marketing budget. Describing sound quality in text is a hopeless exercise. You can never have the receiver understand what you mean, until they actually experience it in person.
  3. Yes, the crossover turns phase 90 deg for each pole, and the resulting delay is not that large compared to what room reflections can do.
  4. I chose processing that resembles some of the problems I see in measurements from systems around. I have some measurements from customers now, and some of those follow the calibration process from start until the customer reaches the crossing between bored and good enough. Some subwoofers introduce so high gd it is impossible to correct for in ordinary av-processors/receivers. Then there is the room. Yes, I could do a better job with frequency response accuracy. Sample material was quickly chosen, drums with more dry character may be easier to hear - or, may be not. Must try it,
  5. I just updated the article with spectrogram charts and subjective impressions from listening in Room2, now at more realistic volume.
  6. Delay is adjustable, and the rest is fixed in the dsp on the bass-system. For a text-book filter there is a delay, and if you adjust delay on mains to remove this, it wqill not sum correctly. But if the slope on the bass-system is different from the text-book, it is possible to end up with something that sums correctly and has zero delay. you end up with flat phase and flat GD.
  7. @maxmercy, yes, this is true. But it is actually possible to remove all gd/phase from the crossover itself, by adjusting slopes and delay. This is also possible to do higher up in frequency, in even in passive crossovers, but then you don't have the option of adjustable delay, so you depend more on simulations to get it right.
  8. Audibility of group delay at low frequencies: https://www.kvalsvoll.com/…/audibility-of-group-delay-at-l…/ It is then confirmed and proven that group delay at low frequencies is audible. This means timing - GD, phase - matter for sound in the bass range, it is not sufficient to tune towards a flat frequency response alone. (Yes, we knew, told you so.. But, now it is actually proven with evidence in a replicable, described, controlled experiement.)
  9. The disaster here is of course the writer of that article will never read you comment, not because he does not want to or does not want to learn how this really works, but because he will never see it. The main problem with audio today seems to be more about communication - getting through with the message. We have the technical solutions, we know the theory, we know how to make this work in a practical audio system.
  10. Yes, something inside the cabinet behind the ports to control acoustic resistance. This is modeled and simulated, at least to some extent. Dimensions and placement of ports, cabinet volume, is nice to get reasonably correct. The damping will always need some experimenting, because it is not straight forward to get good models of the acoustic properties of the damping material. This is not a problem, it does not take much time to get it right. The cabinet does not need to be very deep, but the location of the ports, baffle width, speaker driver size all matter for resulting response.
  11. New articles in the blog-section, published quite recently: The F105 loudspeaker - review-style article on this small loudspeaker with some quite interesting technical solutions: https://www.kvalsvoll.com/blog/2019/04/23/the-f105-loudspeaker/ (Use google translate for the text that did not make it through the author's translation service.) Bass and sound quality - 4 real world examples: https://www.kvalsvoll.com/blog/2019/03/10/bass-og-lydkvalitet-4-eksempel-fra-den-virkelige-verden/ (Use google translate, it continues to improve, and has now reached a performance
  12. There was some discussion about some subwoofers that were linked to my name, in a different thread. Please feel free to ask or comment, and you can use this thread, no need to start a new one. If you go to my web site, you will see product presentations of the subwoofers I sell, and articles related to those subwoofers and bass in general. All presentations and product info are available in English language, most of the articles as well. What I am going to say now, may seem a little strange: I am not on data-bass to promote my products and services. Actually, I am not that keen
  13. No place for this in this thread, regardless of what is for sale or not. Go to the Room2-thread, I will make a comment there.
  14. If you have questions about my designs, you can ask in the Room2-thread, I may even answer. As for this specific construction pictured above here, that is not something I sell or build, this is a diy based on technical input provided by me.
  15. Guide to this season of GOT: 1. Go to Braavos to lend money in the bank for a new screen with night-vision. 2. Valyrian steel is definitely not required for the magnet system in your subwoofers. 3. Most important step: Go to data-bass and learn how to apply bass-eq. Oh, it's this thread. 4. Turn it up and enjoy. Part from the non-existing low bass the sound is good enough.
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