Each stand can hold up to 100 lbs, these are the sturdiest stands available aside from sound anchors
Spire 420Xi monitor stands use IsoAcoustics technology to isolate your speakers from their stands. Why is this important? Decoupling your monitors from their supporting surfaces allows the speaker and enclosure to float independently, reducing the amount of vibrational energy that's transferred to the stand or desk, through to the floor. The benefit is tighter, cleaner bass response, plus a noticeable improvement in the clarity of the stereo image. The engineers here at Sweetwater agree that decoupling your monitors will result in more accurate monitoring in your studio.