In article , Laurence Payne wrote:
On 24 Aug 2009 10:52:05 -0400, (Scott Dorsey) wrote:

The sort of reasoning that puts spikes on speakers but doesn't really
know why. Some say it's to "couple". Others to "decouple". What do
you think they're for?

You can do either... you can couple the speaker to a huge mass, or you can
decouple it from all (possibly resonant) masses. Either method works, and
you can measure whether it's working or not (or you can just put your hand
on the floor and feel if it's vibrating).


Reading at face value, that reply states that spikes either couple or
decouple the speaker from what it's standing on. Depending on which
you WANTED them to do.

This can't be right. What DID you mean?

Another thing, if the floor is vibrating from the air vibrations, and
the speaker is still, the floor will make the speaker shake.

greg

In article , (GregS) wrote:
In article , Laurence Payne
wrote:
On 24 Aug 2009 10:52:05 -0400, (Scott Dorsey) wrote:

The sort of reasoning that puts spikes on speakers but doesn't really
know why. Some say it's to "couple". Others to "decouple". What do
you think they're for?

You can do either... you can couple the speaker to a huge mass, or you can
decouple it from all (possibly resonant) masses. Either method works, and
you can measure whether it's working or not (or you can just put your hand
on the floor and feel if it's vibrating).


Reading at face value, that reply states that spikes either couple or
decouple the speaker from what it's standing on. Depending on which
you WANTED them to do.

This can't be right. What DID you mean?

Another thing, if the floor is vibrating from the air vibrations, and
the speaker is still, the floor will make the speaker shake.


Another thought, when the floor is vibrating, its likely not
to be in phase with the speaker output, and it will be frequency dependant.
At least this tend to stabilize the frequency slewing.

What am I talking about?? !!


greg

GregS wrote:
Another thing, if the floor is vibrating from the air vibrations, and
the speaker is still, the floor will make the speaker shake.

Yes.
But if the floor is vibrating from the air vibrations, you have a more
serious problem than that. A common one, but serious nevertheless.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."