You can read the propaganda from Mangler about the "required" rise time of an amplifier: http://www.manger-audio.co.uk/products.htm
Robert Greene <[email protected]> a écrit : > No speaker requires a "fast" amplifier, > whatever that means. ALL amplifiers that > are not defective are far faster in any reasonable > sense than any speaker is. Some amps > have a tiny roll off of the extreme top > on account of output networks or the like. > But really this is a nonissue for any serious > purposes. > > Robert > > On Sun, 10 Jul 2011, Marc Lavall?e wrote: > > > J?rn Nettingsmeier <[email protected]> a ?crit : > > > >> On 07/10/2011 03:41 AM, Marc Lavall?e wrote: > >>> I'm waiting for a pair of > >>> very directional speakers that should (hopefully) help me enjoy > >>> conventional stereo. > >> > >> then the manger might be for you: > >> http://manger-msw.de/index.php?language=en > >> > >> this is a speaker that has been optimized for very good impulse > >> response behaviour (at the expense of almost everything else). > > > > Then a fast amplifier is required. > > > >> in addition to its quick reaction, it's beaming like mad, which > >> means that it practically eliminates early reflections over a wide > >> band (a lot wider than conventional dome tweeters). its stereo > >> reproduction is stunning. > > > > That's the idea: instead of adding tons of acoustic treatment in my > > listening room, I prefer to invest in directive speakers. > > > >> if you can do with very little efficiency (sorry tube amp fans) > > > > The sensitivity of Manger speakers is about 88dB; that's not so bad. > > > >> and don't mind around 10% THD in the low frequencies (which is not > >> as bad as it sounds, but also not as good as manger make it sound), > > > > Most listeners can't detect 10% THD if the level of the distorted > > signal is low compared to the non-distorted signal. > > > >> then you should try it. > > > > I can't try Manger speakers since they are not distributed in North > > America. Also, I can't afford them. I already made my choice, and > > it's a horn based loudspeaker. Good enough compression drivers are > > cheap; the magic (and the money) is in the horn. > > > >> which none of the above claims to do. home listeners are consumers. > >> there is no point in promoting something to consumers when (as you > >> point out) there is no product. you have to promote it to > >> _producers_. > > > > Right. But I'm a listener, not a consumer. I'm not a producer, but I > > might become a non-professional one, when I'll have a working > > ambisonics system at home. > > > > Why is Ambisonics well known in the scientific community and not > > much elsewhere? Why and how to promote Ambisonics to hobbyists and > > poor students who don't have access to institutional labs and > > studios? Are they a lost cause? > > > > With Internet, we now can do things differently without the classic > > producer/consumer mediation. If your target audience is only the > > producers, Ambisonics will just be patented again and sold under new > > names; it's just a matter of finding new tricks related to > > Ambisonics. I know that's exactly what you're trying to avoid... > > > > I will follow your tutorial to install my home system; without it, > > I'd be lost. Your other tutorial (for producer) shows Ambisonics as > > a spatialization tool for rendering stereo and 5.1 outputs; as a > > "consumer" (I hate this word), why would I want to install a 10 > > speakers periphonic system if producers just keep their amb files > > as masters? There's a missing link... > > > >>> If you could help me understand spherical harmonics, I'd be a "MAG > >>> fanboy" in no time. > >> > >> anyone who can grasp m/s stereo can grasp arbitrary order > >> ambisonics. i'm talking "understand the principle", not "grok all > >> the calculations and their implications to the nth degree". > > > > I grasp it, but I don't understand it. After reading many articles, > > I'm still lost, and I think it's important to understand part of the > > maths. HOA sounds like a nice marketing acronym (it carries a > > lot of mysticism and good vibes), but I can't just "believe"... > > > >>> The best didactic resource I found is a very > >>> strange article titled "Notes on Basic Ideas of Spherical > >>> Harmonics". It's so good that I barely understand 10% of it. > >> > >> isn't that a text by robert greene? i think i've read it. yeah, mr > >> greene is a mathematician, and they like it rigorous. > > > > It's a fine text, but it reminded me how little math education I > > had. > > > >> but you don't need that level of understanding to use ambisonics. > >> you don't have to understand electronics to use an amplifier, and > >> you don't have to understand acoustics to use a microphone. some > >> insight helps, and the more you know the better, but being able to > >> build some piece of gear from scratch is not a prerequisite to get > >> started. > > > > True: there's no need to understand just to "use". > > But it's always nice to know *why* to use! > > There's no satisfaction in being just a "user" (or a consumer). > > > >> check out the link i posted earlier, it tries to introduce the > >> concept of spatial sampling to practical sound engineers. there's > >> one (intentional) gap in the logic, in that it starts with the > >> kirchhoff-helmholtz integral (which strictly speaking is the basis > >> for wfs, not ambisonics) and then jumps to spherical sampling. it's > >> not 100% kosher from a mathematical POV, but hopefully easier to > >> understand. and as the order goes up, the area of correct > >> reproduction expands, so that it ultimately approaches the KH > >> surface from the inside. if you're in a hurry, there are slides as > >> well, which are a lot more compact: > >> http://stackingdwarves.net/public_stuff/linux_audio/tmt10/TMT2010_J%c3%b6rn_Nettingsmeier-Higher_order_Ambisonics-Slides.pdf > > > > I already read your aticles, they are really good to intuitively > > understand Ambisonics. I'll read them again and again, then try > > to review my old maths and learn new ones. > > > > Thanks! > > -- > > Marc > > > > > > _______________________________________________ > > Sursound mailing list > > [email protected] > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > _______________________________________________ > Sursound mailing list > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound > _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
