[Arny Krueger]

"Scott Dorsey" wrote in message
...
Arny Krueger wrote:

The fact that suspending speakers by means of say fishing line has little
effect on their sound would seem to make the point that mechanically
coupling the speaker to its support makes very little sonic difference.

But it does, it has a noticeable effect on the sound at low frequencies,
and you can see the effect on a waterfall plot.

Evidence?

F=MA seems to apply to speakers. The M is usually very large compared to
F,
so the A is quite small.

The M isn't anywhere near large enough.

Evidence?


A subwoofer driver might have 200 grams of moving mass. It would be put
into an enclosure along with itself, giving a total mass on the order of 20
kilograms or more. That is a 100:1 ratio.

If you will allow that for every action there is an equal and opposite
reaction, then the motion of the enclosure is 1% or less of that of the
moving mass of the driver. That's like 0.1 dB - measurble but hardly
audible.

That's why we fill speaker stands with lead shot.

Well, some audiophiles do.

If you can physically see the speakers moving around when
the volume is turned up, there's a problem.

You mean "physically see the speaker enclosures moving around when the
volume is turned up", right?

Never saw it happen to a significant degree. In the example above, the
enclosure if freely suspended and with the cone moving say 25 mm, would have
the enclosure moving 0.25 mm - no doubt palpable vibration but not
significant motion.