What is it exactly that is under so much pressure? - Printable Version +- Devialet Chat (https://devialetchat.com) +-- Forum: Devialet Chat (https://devialetchat.com/Forum-Devialet-Chat) +--- Forum: Phantom I (103 DB, 108 DB, Premier Classic, Silver & Gold) (https://devialetchat.com/Forum-Phantom-I-103-DB-108-DB-Premier-Classic-Silver-Gold) +--- Thread: What is it exactly that is under so much pressure? (/Thread-What-is-it-exactly-that-is-under-so-much-pressure) Pages:
1
2
|
RE: What is it exactly that is under so much pressure? - Confused - 11-Oct-2015 A genuine very well done to Playel for doing the calculation. Fascinating stuff. All this makes me realise what a fascinating thing sound is, I could research this all day if I had the time. Now on a less serious note. For reasons I'd rather not go into, a little while ago I was reading that the pressure of human farts are anything up to 4 psi. Now based on the numbers, 12.6 kPa is equal to about 1.8psi. I guess that "half the power of a decent human fart" is unlikely to make into the next Devialet advertising campaign. RE: What is it exactly that is under so much pressure? - Pleyel - 11-Oct-2015 (11-Oct-2015, 19:37)Jean-Marie Wrote:(11-Oct-2015, 19:23)Pleyel Wrote: I don't think a Phantom would explode if you open it, as I don't expect any static pressure difference vs outside air.deleting my previous answer as it appears that I was wrong and Pleyel was right. My bad not to have verified before replying. No pb, Jean-Marie. Btw, measuring change in distance between left and right woofers (2x +/-12 or 13 mm = 26 mm) and summing their volume (2x3 l = 6 l) give the same relative pressure change, so the same sound level. Don't hesitate to correct my math, as I'm not an "Expert"... I discovered a rough estimate of sound levels, expressed in relative pressure change in %, which I find easier to visualize than dB SPL. Usual sound levels correspond to a very small relative change (0.01% pk is already a loud 111 dB SPL). I also realized the absolute, theoretical maximum level, when pressure ranges from 0% to 200% of average pressure with a sine wave, but the same formula gives 20*log10 (1/1.414 * 1000 hPa / 20 µPa) = 191 dB SPL, that is 3 dB less than the 194 stated by the Wikipedia article, as if we shouldn't divide by sqrt(2) to convert (peak) amplitude to RMS: any clue, someone? Anyway, thanks all for a great laugh about the pressure of different departments... RE: What is it exactly that is under so much pressure? - ChalleB - 11-Oct-2015 Ah, now I understand everything! It's all so clear (well at least the sound coming from my phantom is ) Anyhow, whatever the pressure thing is all about, the phantom is a really great bit of kit! and I am in awe and grateful for what Devialet has managed to do! |