Consider the Vanatoo zeros or ones. I heard them at Axpona, and they blew away most speakers several times their size and price. They are amplified, so you don’t need a receiver or amp, and have a subwoofer out, and lots nice features, like Bluetooth with Aptx.
The zeros will fit your size, budget constraints and can be easily wall mounted, or fit anywhere. They would outclass any soundbar. The One’s may not be wall mountable (passive radiator on the back) but sound excellent- can easily outclass most larger bookshelves.
I cannot post links, but you can find them at Vanatoo.com or on Amazon
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