The best Bluetooth speakers are a great way to take your music on the go or amplify the sound indoors without spending hundreds upon hundreds of dollars. But at a certain point, Bluetooth speakers become expensive enough that there are similarly priced sound systems that sound much, much better than a single speaker unit.
Take the Sonos Move 2, for instance. As a portable speaker, it's about as good as they come for $450. It sounds good, features a massive battery to help you port the speaker around with you. But, if you spend $450 on some HiFi components, you ditch portability and make up for it with flexibility and sound quality.
My first HiFi was made up of second-hand units that I grabbed for cheap on eBay, but that comes with its own risks. My first amplifier only lasted about a wee