No, one KH750 can support both 310s. And you're right about it coming later. But I just wanted to put my two cents in on these and let you know you're not really getting the real experience with your monitors without the proper setup. I'm coming from years with ATCs prior to these so they're not the only great monitors I've worked with. Also a three way monitor will always paint a clearer picture for your, especially in the mid range, than a two way. But in the end, this is your setup, go with what works for you! Always dig your tones and recordings so I'm sure your ear will guide you to the right place. My interface is the Apogee Symphony Mk2 SE.