The EA-7 speakers don't have the same "ooomph" that the SX has, but it sounds nice at lower volumes. I'd describe it as "boxy". There's not as much area for bass reflex in that teeny package. Not a downer for most, but I like the SX to stand alone for many of it's intended uses. I hooked up the Fishman sub to it today, and MAN - what a great combo.
https://www.sweetwater.com/store/detail/SASub--fishman-sa-sub-300w-subwoofer-for-the-sa330x

HIGHLY recommended.