Out on the tiles...with speaker spikes.

No kidding, pennies sound better than quarters. This experience was actually the first time I knew I was a freak. I could hear the difference between quarters and pennies, and it was similar in general terms to the difference between silver and copper in interconnect and speaker wire. All I could think of was "Omigod, what's next?" I also endorse the Audiopoints products, having used them to good effect under many components. Also, I believe Mapleshade recommends brass cap nuts to put under their footers (upside down to "catch" the point) to protect wood floors.

OK , this may get some flak in response but I used to use pennies under my spikes to protect a wood floor where I lived. They worked very well and they were cheap(about 3 cents). They'ld probably work for your tile floor and if not it won't even cost you a nickle(which you could also try).

Being crazy I have tried a lot of different stuff under speakers and racks on my tiled floor at my beach house. I found wood pucks to be hopeless, most metals to be problemmatic, but brass to be best of the bunch. Even tried various exoticly expensive stuff like the pucks from various companies like Black Diamond Racing - yuk, the Brass was better. The ones I use cost 1 NZ Dollar each, but you will not get them anywhere else in the world. I reckon the Systrum ones look adequate, albeit more expensive. While you are at it you can get brass replacements for your steel spikes (assuming they are steel) from them. (Can't say I like their racks though). I still found there to be is a slight tinge of metallic twang there with brass, but not much and speed was maintained. One slight tweek got me to Nirvana - I wrapped plumbers tape around the thread of the spike before inserting into the speaker, and this seemed to just damp the metallic twang without any noticeable mushiness sneeking in.