Dave Malham <dave.mal...@york.ac.uk> a écrit : > Actually, a square or rectangular decoder's outputs are such that if > all four outputs are mixed together in equal amounts, the directional > components (X and Y) will cancel out automatically leaving just the > W - which is generally what would be sent to the sub... > > Dave
True! And the math is easy (shame on me). But I'd rather use the original W signal then a mix of all signals, just because the (analog) mix could be imperfect. Also, there's already a dedicated output for the sub-woofer (the .1 channel) on 5.1/7.1 sound cards. Matthew Palmer <palme...@mymail.vcu.edu> a écrit : > What is needed between the computer & the speakers like how do I get > the computer to acknowledge each speaker from say this set ( > http://static.clickbd.com/global/classified/item_img/512646_2_original.jpg/ > 3.5 mm and six channel direct audio cables (RCA cable not included)) > as an individual channel? Basically, you would connect the 5.1 kit normally, using the 3.5mm cables between the PC 5.1/7.1 sound card and the sub-woofer, according to their colour codes: green (front), black (rear) and orange (sub/center). But then, you would need an apropriate Ambisonics decoder... -- Marc > > On 21 October 2013 01:11, Marc Lavallée <m...@hacklava.net> wrote: > > > Matthew Palmer <palme...@mymail.vcu.edu> a écrit : > > > I'm wondering if it (4 sets of Logitechs) can give me 3d > > > gratification for a little over $200. I know I'm definitely > > > sacrificing quality but it will take me ages to save up for a > > > proper set-up. > > > I don't understand what kind of amplifier would be needed though. > > > > Yes! 4 small speakers with one sub are enough as a starting point: > > I suggest reading "Localization in Horizontal-Only Ambisonic > > Systems" : http://www.ai.sri.com/ajh/ambisonics/BLaH1.pdf > > > > Use a square or rectangular configuration, and drive the sub with > > the W ambisonic channel; you can use a multimedia 5.1 kit (with > > integrated amplifiers), but the sub should be driven separately, > > not by a mix of the 4 decoded speaker channels (that's my > > comprehension). For un-amplified speakers, you can use cheap > > D-class amps. > > > > > I don't fully understand what cross-over frequency is (it sounds > > > obvious though) but maybe by reducing the center channels from the > > > set-up , I'd reduce the amount that is happening. > > > > I would not use the centre channel; there are experimental 5.1 > > decoders but I never tried. The cross-over frequency is between the > > sub-woofer and the satellites. Ambisonics works well at low > > frequencies in small rooms, at least down to the Schroeder > > frequency (usually around 150Hz, depending on your room size and > > acoustic treatment). That's why 300Hz is a bit high, but it's not > > catastrophic. > > > > Ambisonics with height is possible with a "3D7.1" configuration > > (using a 7.1 speaker kit). I yet have to try it. > > > > -- > > Marc > > > > > On Sun, Oct 20, 2013 at 7:12 PM, Charlie Richmond > > > <charlie....@gmail.com>wrote: > > > > > > > On Sun, Oct 20, 2013 at 3:59 PM, Marc Lavallée > > > > <m...@hacklava.net> wrote: > > > > > > > > > > > > > > What matters is rigidity; if a plastic enclosure is rigid > > > > > enough (for its size), then it would sound the same than a > > > > > hard wood enclosure. In the specific case of the Z506 model > > > > > from Logitech, wooden enclosures for the satellites would > > > > > make no difference; the drivers, the amps, and the enclosures > > > > > are too small to shake. Only the sub-woofer enclosure is made > > > > > of MDF, for a reason. > > > > > > > > > > So, why not using the Z506 5.1 kit from Logitech? "Multimedia" > > > > > speakers are primarily designed as computer accessories; some > > > > > are probably well made, excluding the one in the MoMA's > > > > > permanent collection (unless aesthetic is the most important > > > > > criteria). I wouldn't trust its sound quality; it's a bit > > > > > small unless the listening distance is less than 2 meters, > > > > > the centre speaker does not match the four other satellites, > > > > > the centre speaker have 2 mids and the satellites have one > > > > > mid and one tweeter, and the cross-over frequency for the > > > > > sub-woofer is probably near 300Hz, which is a bit too high. > > > > > For Ambisonics, I believe that better quality full-range or > > > > > coaxial speakers, all matched, should be preferred. > > > > > > > > > > I would only such use small multimedia speakers for a very > > > > > compact periphonic installation, along with 4 to 8 small > > > > > sub-woofers for a supplemental horizontal or periphonic low > > > > > frequency decoder. > > > > > > > > > > > > > Agreed. That said, the Logitech self powered systems are > > > > generally extremely well made and sound very good, imho. > > > > > > > > C-) > > > > -------------- next part -------------- > > > > An HTML attachment was scrubbed... > > > > URL: < > > > > > > https://mail.music.vt.edu/mailman/private/sursound/attachments/20131020/73b9a2d1/attachment.html > > > > > > > > > _______________________________________________ > > > > Sursound mailing list > > > > Sursound@music.vt.edu > > > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > > > > -------------- next part -------------- > > > An HTML attachment was scrubbed... > > > URL: > > > < > > https://mail.music.vt.edu/mailman/private/sursound/attachments/20131020/2bfcc5f5/attachment.html > > > > > > _______________________________________________ Sursound mailing > > > list Sursound@music.vt.edu > > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > > > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > > _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
