Altec Lansing M650
There is a control panel on the device body, so you can easily access the volume control or remote without having to interact with a cable or another device it's connected to.
A speaker driver is an individual transducer that converts electrical energy to sound waves. More drivers may result in better sound quality.
Vifa Stockholm 2.0
The driver unit is the component that produces sound in the device. Bigger drivers are more powerful and can produce better bass.
Meridian Explorer 2
Soundmatters FoxL DASH7
A remote control allows you to control the device remotely. The remote control can be included or optional.
An amplifier is integrated into the device. An audio amplifier takes a small signal and makes it bigger without making any other changes in it which results in better sound, so any sound source can be connected to speakers.
Devices with a subwoofer have a higher quality, deeper bass.
More microphones result in better sound quality and enable the device to filter out background noise.
Amazon Echo Show
An auxiliary input allows you to play other audio sources by connecting them through a simple audio connection like a 3.5mm jack, i.e for MP3 or portable DVD/CD player.
The Apple dock connector is a proprietary 30-pin connector that is common to Apple devices (iPods, iPhones and iPads) predating the Lightning connector. Allows you to connect older Apple devices, play music and at the same time charge it.