Ghosthouse, you are very close.
The brass cones 'couple' the speaker to the floor and thus act as a vibration 'sink', sort of like a heat sink. If carpet, or rubber feet, are between your speaker and floor, then the speaker will be isolated and the energy cannot be drained to the floor.
Its debatable, from vibrations perspective, if coupled or uncoupled is better. I think it depends on the speaker designer / design.
Three feet are most desirable. Four will 'over constrain' the speaker. Ever sat on a 3 leg stool that wobbles? Nope, didn't think so. A 4 legged stool however... wobble wobble wobble.
Brass is good. Great internal damping and nice and heavy. Spikes are only nessasary to pierce the carpet.
A big chunck of mass near the bottom is better too. it will lower the first mode frequency (good, perhaps out of the audio spectrum) and it will act like an vibration absorber because of internal damping.
Good to know that 7 years of mechanical engineering school is good for something.
Lucas
The brass cones 'couple' the speaker to the floor and thus act as a vibration 'sink', sort of like a heat sink. If carpet, or rubber feet, are between your speaker and floor, then the speaker will be isolated and the energy cannot be drained to the floor.
Its debatable, from vibrations perspective, if coupled or uncoupled is better. I think it depends on the speaker designer / design.
Three feet are most desirable. Four will 'over constrain' the speaker. Ever sat on a 3 leg stool that wobbles? Nope, didn't think so. A 4 legged stool however... wobble wobble wobble.
Brass is good. Great internal damping and nice and heavy. Spikes are only nessasary to pierce the carpet.
A big chunck of mass near the bottom is better too. it will lower the first mode frequency (good, perhaps out of the audio spectrum) and it will act like an vibration absorber because of internal damping.
Good to know that 7 years of mechanical engineering school is good for something.
Lucas