I am using this pair to support my JBL LSR-305s and with works well for this purpose

The smallest ISOs make a very good pairing with the Vanatoos

I have a pair of Mackie CR4 monitors on these stands and they don't vibrate very much to begin with so for the price and other issues, I would not purchase again.

I bought a pair of these to support a pair of JBL LSR305 monitors.