Speaker spikes-worse sound-what gives?


I recently bought a pair of Silverline Sonata lls and set them up in my family room (20x20. After some weeks of finding good positioning, I screwed in the spiked feet that came with them only to find a very different and somewhat worse sound. The base not only tightened but really became thin although the top end opened up a bit. The live sounding D. Krall now sounds like she is coming out of a box. The room is heavily carpeted wall to wall. The rear wall has cedar planking on it. The one wall that has windows is covered with heavy drapes and honeycomb shades.

I know the easy answer is to take them out, but I thought that spiked feet always improved the sound.

What gives?

rest of system is EAD Ovation, Aragon 8008 amp, Moon Nova CDP. (System is a little bright but not harsh. Tried using Red Dawn ICs and speaker cable but made it too bright, harsh and analytical. Before the spikes)
jeffg
It may sound a bit extreme, but if you have the ability to place supports under the floor (like steel jack posts directly under the joists), you may hear significant improvements. I've done this in a couple of installations, and the improvement was substantial... helped with turntable vibration as well. On older houses especially, the floors really tend to bounce!

Cliff
I just moved my turntable to a wall bracket mount and has no skips / bounce when the kids scamper by.

Scott