why spikes under speakers???


could you guys educate me about the use or need for spikes under speakers, it seems to me that putting an air pocket under a speaker would be the last thing you want to do, isnt bas about pressure? and if you put a gap of air between speakers and floor arent you losing some of what makes bass work? I am not claiming this to be bad, I simply want to pose my questions about this concept and get educated on why this is a good idea, and when it may not be a good idea...thanks
chadnliz

Showing 8 responses by eldartford

Spikes are, by definition, pointy, so the contact pressure between the spike and the floor is much higher than if the speaker were supported by a large area, like the wooden bottom of the box. Therefore, the spikes will dig through any soft floor, such as carpet, until they hit something hard and unyielding, like wood or concrete. A speaker on spikes will have a solidly-mounted feel to it. Audiophiles who believe that woofers can move enclosures think this is important. (Actually, woofers don't move enclosures, as can easily be determined by hanging a speaker with cables). If there is any advantage to spikes I would bet that the resulting air space under the speaker acoustically decouples the speaker from the floor surface.
S7horton...Woofers do not move speaker enclosures. To answer this perrenial question (in my own mind) I have suspended speakers with rope and looked for movement. None observed. None at all. Others who have actually suspended speakers agree. People who sell spikes disagree.

Pbowne...Air space below the speaker will permit the LF pressure wave to pass below the enclosure. This has nothing to do with the wavelength of the sound. Tall skinny speaker stands will do the same.
Blkadr...The notion that a mechanical structure (cone) can transmit vibration one way, and not the other has no basis in fact. Vibration, by its nature, is a back-and-forth motion.

Vibration of enclosure walls can be a significant sound source. It is minimized by solid construction, with internal braces, curved panels, and damping material. Except for the bottom panel of the enclosure, where the spikes/floor may serve as a brace, spikes don't help.
S7horton...Your "simple physics taught in high school" must mean Newton's Law of Action and Reaction forces. But you evidently missed the second class where we learned how to calculate how much motion a force produces.

The suspended speaker motion test was done with a single rope, so it isn't like spikes.

Ttrhp has a good reason.
S7horton..."Sounds better" is a perfectly good reason. You should not try to explain it further, as this will just get you into trouble.
S7horton..."knowledgeable" on this subject, perhaps, but that's not the same as "intelligent".
First Law....You can't win.

Second Law...You can't break even.

Vibration must be converted to heat in some damping medium. If you "drain" vibration to the earth, you are contributing to global warming. Shame!