I think most people will find the 8" driver of the SP-8 to more than satisfy for their musical needs. I have a 7" driver in my two way Atalante 3 monitors and they are just a tad shy in the bass compared to my JBL 4319s with their 12" driver, but that's in my small-ish room. I get all the bass I need with that 7" driver.
This is a smart move by Mofi in reducing the imposing size of the SP-10 to accommodate tastes and the old WAF.
All the best,
Nonoise