One of the nicer things I really like about streaming devices are they could be used simultaneously with traditional cable/satellite boxes and the like within the same household and/or account. This allows for individual flexibility within a individualized household from 1 to multiple populations. Or a simple way to see if going 100% streaming is right for YOU, not someone else.
Love those liberating choices!
Have a similar setup in my house. Using an old Pioneer receiver to control the sound for all devices: Roku, Fire stick, DVD player, and OTA TV. It plays through 4 medium size Infinity speakers spread around the room, plus an old speaker of unknown brand I put behind the TV for voice. To give you an idea of how old the receiver is, it's best audio capability is Dolby Pro logic. It's all analog and probably classified as an "antique" but it produces some pretty good movie sound with separation and movement among all speakers.
All my CDs have been converted to mp3, but I haven't added that to the system yet. Just use those in the car. Pandora suffices in the house. Still mostly living in the digital dark ages, I guess, but guests often remark about the realistic sound.