@mijostyn --
@avanti1960 --
+1 to both.
The last thing you want to do is put a subwoofer on springs. At some low frequency it will start shaking. Vibration/shaking in any speaker equals distortion.
@avanti1960 --
Speakers and subwoofers like to be solidly mounted to add structure to the enclosure, they do not like to be in micro motion.
+1 to both.