CNET's experts are always testing the newest smart technology to see how it functions in the home. After all, if you're going to the trouble of setting up a device and app, you want to make sure it's effective, worth the cost and respects your privacy -- which brings me to this list. Amazon's newest smart speakers come with spatial audio and other sound enhancements, which are especially noticeable in the powerful Echo Studio. With the Alexa app, this smart speaker can connect to a wide variety of services, from your favorite music streaming option to Uber, food delivery apps and more. Alexa can also connect with many smart home devices and control them with a voice command, including lights, locks and smart plugs. You can even pair two Studios and connect them to a compatible TV for theater sound.…