There was a time when single-box just-add-speakers systems were compromised budget affairs. They were aimed at people who didn’t want the complication (or cost) of separates and were willing to put up with the significant shortfall of performance that resulted.

The most capable of this breed was one of Denon’s DM micro systems, which would typically set you back a couple of hundred pounds and still sound pretty good. If you wanted something that sounded better, but was just as convenient, there was no real option until the arrival of Linn’s Classik about 20 years ago.
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https://www.whathifi.com/reviews/linn-selekt-dsm-review