I live in Japan and I can tell you for a fact that these are sold separately and not necessarily intended to be paired up to their A4 paper sized audio gear. The HR is the "upgraded" edition with a "better" tweeter. I actually preferred the soft domed non-HR edition even though I would never consider either of them for purchase, they have a typical Kamaboko style sound signature in the real world in a normal sized Japanese apartment. No highs, no lows, no definition is what the Kamaboko style of sound is known for, the alternative is called Don-Shari, which means heavy on the bass and treble.
These have been discontinued for sometime. The last time I saw a pair, they were on clearance pre-covid.
https://teac.jp/int/product/s-300hr/top
Just some added insight into the speakers. This basic coax design has been a theme for Teac for some time now. But as the market is changing, it seems they have stopped producing speakers for now. The Japanese Video Grand Prix award, or VGP award is something the manufacturers literally pay for, it is not awarded for producing a superior product.