I have a SMSL Bluetooth amp on my back porch that I use with in ceiling speakers. When I sold my Thiel speakers last winter, I set them up in my shop with that SMSL amp. Thiels have the reputation of being hard to drive so I was kinda wondering if that little amp might burst into flames when I turned it on. It was fine although I started with the volume turned down really low.
So I’m playing songs through my iPhone with Bluetooth to my Thiel speakers and I was amazed at how good they sounded at first. Really shocked. I turned up the volume a little and then I could tell that the sound was lacking. But without the experience of hearing a good hifi rig, I can see how someone would be satisfied with the sound of these amps and not feel the need to spend more money- at least until they bring home a $2000 amp to try.
You get the 20-20k range with any amp but more money brings better bass, smoother highs, timber, 3d holographic sound, imaging, space, blacker background, etc.
The coolest experience with my rig these days is to play a Chorale piece. The singers go wall to wall and up to the ceiling. I can make out each individual voice in the choir vs. being just a cloud of sound. It’s not for everyone but that gives me a thrill.