As with another recent poster, it would help if you clarify whether you mean bookshelf, as in a speaker to sit on a shelf, or possibly direct on the wall, or whether you mean a standmount, often positioned away from the walls. The two functions are different. If the latter, then it would be worth checking out this recent thread:
And re your question, the declared impedance gives no idea as to how easy speakers may be to drive, though a look at the impedance curve (rarely available) could well help.
It would probably help if you indicated your anticipated max budget.
You might want to try Dynaudio Emit M20s. I heard them sounding very enjoyable on the end of an Atom, which is only slightly more powerful than your UQ. Even with dedicated stands they’d be well within your budget.
Hi. I posted on here a while ago asking about suitable speakers for a Uniti Star, suitable for my living room (3m x 4m). I was happy with some suggestions (PMC, Neat), but some were too dear, or too big. I sold my old B&W floorstanders (too boomy), and read many reviews and listened to many speakers including ‘bookshelf’ ones. I eventually plumped for the Spendor A1s. I’m delighted with them. I was afraid they’d lack bass; at that size, the bass isn’t visceral. But it (to me) more than compensates in bass tonal quality, attack, agility, rhythm and timing. They’re very ‘easy’ to listen to for extended periods too, and at low volume, with an excellent balance of fun and resolution. Vocals are spellbinding. Er no, I don’t work for Spendor! But you owe yourself a listen - some dealers I’ve been to seem not to try to sell them as much as they deserve, I found.