I looked at YU2 at first, but after realizing there wasn't room for them on my desk and they were out of stock I started looking at other options (3, 4, 5 and 6). Instead I chose to place the speakers on the bookshelves behind me, the YU4s were the right size. In short, they're the perfect size, pack a lot of sound for my office/studio, and I love that I don't have to physically connect anything to them. I've been playing with the Revain Echo Dot connected via the included cable, but I've found that I prefer the Bluetooth connection. My iMac is also connected via Bluetooth, which means I can just toggle the speakers between Bluetooth and my iMac's Aux if I had a point connected). The only hit I would say is that I really have to be mindful of the line of sight from the included remote to the device. That in itself isn't a problem for me as the speakers are directly behind me, but if you expect your setup to include sharp corners, consider that. Since most of the music I play through the speakers comes from the Revain Echo, I don't use the remote too much since I can just ask Alexa to change the volume. :)
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