So I bought them and sure enough they have issues. I have received 3 so far and 2 of them have had a persistent hum. I’m still waiting to hear back from Upscale on yet another replacement. You might wonder why I’m not giving up on them; well outside of the hum, they perform really well and integrate really well both sonically and visually with my Fyne Audio F704. Being that Tannoy and Fyne have a lot in common, the walnut finish on the subs exactly match the finish on my speakers.
Once you adjust the equalizer they completely disappear and blend perfectly with the speakers. Also, they are the best looking subs I am aware of for under $5K. I had a local dealer listen to them and tune them for my room, and he thought they performed very well outside of the hum. Dealer did mention he thinks you can get similar performance from SVS subs but you will be stuck with an ugly black box.
Back to the issues, I don’t think I’m the only having these problems because Upscale have pulled the subs from their website. Anyway, the hum is not so bad that the subs are unusable but I’m hoping the next replacement will be issue free.