The other major differentiator for the Fire TV Cube is how it works with other home theater devices you may have in your living room. The slick glass sides of device hide a multidirectional IR blaster (they also pick up dust very easily, unfortunately). The Cube also supports the more modern CDC (via HDMI) technology, so the Cube can power up your TV, sound system and even cable box, if you want it to. In a demo, Amazon showed off a routine where you can just say "Alexa, I'm home" — the home theater gear all came to life, along with the lights in the room. You can customize the routine to match the smart home gadgets you have that Alexa can control, or just use a simple "Alexa, watch TV" to start everything up.

The Fire TV Cube's voice search is more capable than past versions, as well. A good example is control over the aforementioned cable box. Once the set-top box recognizes it, it basically acts like a remote. You can say "Alexa, tune to NBC" and it'll know to switch over to the cable feed and the requested channel; you can also say "tune to channel 11" if you're the sort that remembers your cable guide.

Amazon says that the Cube supports boxes from Comcast, Dish and DirecTV and that 90 percent of households with cable or satellite TV should be covered. And if you want to hide your ugly cable box away from your otherwise-pristine living room setup, Amazon is even including an IR extension cable that you can place next to your cable box. That lets the Cube turn it on and off when the two devices aren't in line-of-sight.

If you're more inclined to use an over-the-top TV service like PlayStation Vue or Hulu's live TV, Alexa will work with that too. If you request a specific network, channel or show, the Fire TV Cube will search through whatever services you've hooked up, including ones that provide live TV.

The Fire TV Cube can do basically everything else you would do with your voice, with the added bonus of not having to hold down a button on your remote. (The Cube comes with the standard Amazon remote for when you don't want to talk, or if you do want to use the voice button.) The UI has been slightly modified, taking some cues from the Echo Show. There are small overlays near the top and bottom of the TV with suggestions like "Try saying 'Alexa, show me dramas.'" Those prompts are pulled directly from the Echo Show and can definitely be helpful giving you ideas of just what you can ask the device.

If you know exactly what you're looking for (or what specific app you want to open), you can of course tell that to Alexa and go straight to what you want to watch. That even works when the TV is off — so if you always go straight to Netflix first, you can say "Alexa, launch Netflix" and the Fire TV Cube will power everything up and tune in to Netflix.