opaqueice wrote: > Robin Bowes;191617 Wrote: >> Not at all. You're assuming ideal speaker behaviour. > > Actually no, I wasn't.
Then you don't understand how a speaker works. >> Sure, both speakers will oscillate at the same frequency, i.e. the >> cones will move at the same velocity. > > Umm... no. If they have the same frequency but different x_max, the > one with larger x_max will move with a greater average velocity, > greater v_max, etc. Just think about it for a moment - it has a > larger distance to go in the same time. You said: > Compare two cones, one large and one small, with a pure tone input, > but amplified differently so that both speakers produce the same SPL. "same SPL", i.e. amplitude is the same, i.e speakers are moving the same distance. >> But, the larger one will have more inertia and will take longer to >> get going. > > True - that's called phase. If the phase response of the speaker > >> The speed of the cone doesn't come into it - all speakers must >> vibrate at the same speed to produce the same frequency and, apart >> from non-linearities, that speed is constant over the whole are of >> the driver. > > The first part is wrong, see above. No, it's not. frequency is directly related to the speed of vibration, so to produce a certain frequency the speaker *has* to vibrate at a certain speed. > The second part is also wrong - > conventional cones are fixed at the edges, so clearly the speed can > not be (and is not) constant across the area. <sigh> The cone on a speaker is not fixed around the edge - it is mounted on a suspension ring which flexes as the inner cone moves in and out. Try it - take the grilles off your speakers and push the cone in gently. Better still, look here - there's a nice animated diagram that shows just how it works. R. _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
