jdm56;230314 Wrote: > All I can tell you is that is contrary to multiple loudspeaker articles > I've read over the past 30 years, which have unanimously stated that > dipole's output falls off with distance less (about half the rate) than > monopole's.
There are two differences. Monopoles produce a simple radiation pattern which is non-directional (meaning the air is always flowing towards or away from the source) and with a sound pressure level that falls off like 1/r^2. Dipoles are slightly more complicated - far away they produce a radiation field which also falls of as 1/r^2, but with a cosine dependence on the angle (directly in front and behind it's maximized, and to either side it's zero). Therefore if you normalize to the SPL on-axis far away the dipole radiates 1/2 the power of the monopole. However dipoles also produce a near field component with an SPL that falls off like 1/r^4. So the SPL falls off much more rapidly for a dipole when you are close to it, and slightly more rapidly when you are far away (in units of the wavelength of the sound). There's also a difference in the dependence on frequency - a dipole's radiation power grows very quickly with frequency, which is why the sky is blue. > > And if "non-directional" is synonymous with "monopolar" to you and > your crowd, then I suggest the lot of you get yourselves a good > dictionary and have a go at it. I didn't say they were synonyms, but non-directional here implies monopole. Any other radiation pattern varies with angle as you move in a circle around the speaker. Mattiasa;230330 Wrote: > > opaqueice: I too have ordered a ATI 6012, mainly because of 5.1. I have > listened to the Orions with more power (Rotel RMB1077, 7x130W ICE > technology), with no issues. But, I do not believe you'll use more than > a maximum of 20W per channel, as the efficiency is really good. Congrats! Yeah, I agree it's probably fine using more power, but as you say it probably won't be necessary (I have neighbors!). -- opaqueice ------------------------------------------------------------------------ opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=38593 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
