hardwood floor and speaker

To couple, or not to couple. If of the 'not to couple' school purchase some half inch granite to put the spikes on. Of course they will need WAF. Granite goes for about $40 per sq. foot these days.

You will usually suffer less damage if you stick spikes in the floor, not the wife.

http://www.taylorsales.com/SuperSpikes.htm

I've used these previously, and they worked great.

I use Lovan footers. They are thinner than many, but are made of hardened steel so seem to hold up fine. I put thin felt under them so I can move the speakers easily. Unfortuntely, they come in a pack of 6 (there stands are often 3 legged), but some places sell them individually.

http://www.lovanusa.com/product_info.php?cPath=26_28&products_id=29&osCsid=a533920c4c854e51cdc5abd861342f0e