Richard Lamont wrote:

The sound is supposed to come in a straight line from the speaker,
through the air, to your lugholes. It is not supposed to go via some
random scenic route involving whatever your loudspeaker is parked on.

Agreed.

Therefore your speakers should not be mechanically coupled to anything.
They should be mechanically isolated. Spikes are audiophool nonsense.

As I understand things, mechanical isolation is exactly what spikes
do. Maybe they can transmit some high frequencies but I don't see
them able to transmit low frequencies since the point of the cone
would have to vibrate at those frequencies. If the point is on
something rigid, like a slab of something, it's not going to move
much.

What you need is a nice thick sheet of neoprene rubber instead. Then the
sound will come from your speakers and not from whichever bits of your
building happen to radiate the coupled vibration. If you have carpet and
underlay then the neoprene probably isn't necessary.

I can see low frequencies moving quite easily through neoprene and
carpet.

Paul P