I have a pair of the S30's and they're great speakers, especially at the price. Be aware that while the front measures 9" x 6" they're a little more than 9" deep and take up a fair amount of real estate.
The speakers I use on my desk are JohnBlue JB3's. They're single driver speakers but have remarkable bass for their size and are considerably more refined sounding on vocals and acoustic music than the S30's. They're substantially smaller than the S30's, as well, and beautifully finished. I use them with a 10 watt tube integrated and am extremely happy with the sound. No idea how they'd sound with the AR30, though.
The speakers I use on my desk are JohnBlue JB3's. They're single driver speakers but have remarkable bass for their size and are considerably more refined sounding on vocals and acoustic music than the S30's. They're substantially smaller than the S30's, as well, and beautifully finished. I use them with a 10 watt tube integrated and am extremely happy with the sound. No idea how they'd sound with the AR30, though.