the subs are not what the "stability" issue is over, its the amp. Granted, you need the foresight when buying subs to determine what the amp needs to be able to do. Make sure whoever hooks up the amp, also hooked up the subs, and knows how to add impedance, and read a manual on the amps capabilities. Hollar if you get the equipment and get confused, we'll gladly help you vs. letting you cook an expensive amp.