A:AnswerYes. According to Bose, the AM300 will connect to the 700 sound bar.
https://community.bose.com/t5/Smart-Home/Soundbar-700-compatible-with-Acoustimass-300/td-p/172532
A:AnswerI'm also 76 years old and as of yet have not noticed the problem you described with my new 700 soundbar and I turn up the volume quite a bit, hope this helps
A:AnswerYou certainly can! The Soundbar 700 features our SimpleSync technology, enabling you to listen to TV audio on your Noise Cancelling Headphones 700 without disturbing anyone around you. More information is available at https://bose.life/2rwMhsi.
A:AnswerNo you cannot mount the soundbar directly to the tv. If you buy the soundbar holder you could mount it underneath of the tv, if you have the space.
A:AnswerThe Soundbar 700 is not compatible with SoundTouch speakers. You can, however, enjoy audio on both categories of speakers simultaneously using AirPlay 2.
A:AnswerIt is very useful for replacing the sound from th TV speakers. And it has the Alexa and google assistants so you just tell it what you wanna watch, turn volume up...etc
A:AnswerEverything Bose connects to Bose and the Bose connect app. You can even pair other branded Bluetooth speakers and headphones but I don’t think connecting to a receiver is going to work.
Consider this a ReceiverLess situation.
A:AnswerThe soundbar has a connection on the back which you can connect. Or if your turntable has Bluetooth you can connect via Bluetooth with the soundbar.