A:AnswerI haven't actually used a Bluetooth microphone with this speaker. But I do use a Bluetooth transmitter from my projector to the speaker, with no issues.
Which I would suspect your microphone uses the same "transmitting" Bluetooth technologies as my audio dongle does. So I would be 99% sure its gonna work.
A:AnswerLet me provide more information on this subject. The Toshiba TY-ASC60 does not have a turntable "phono" pre-amplifier built in, it has a line input via a 1/8 stereo connector (similar to a headphone plug). However, if you have a turntable with a built-in pre-amplifier, then it will produce sound loud enough to be amplified thru the line input of the Toshiba TY-ASC60.
Old turntables do not have a built-in phono pre-amplifier. Some of the newer turntables have a built-in phono preamplifier, you need to investigate the turntable that you are going to use. On the other hand, you can buy a stand alone turntable pre-amplifier, plug the turntable to the turntable pre-amplifier, and then the pre-amplifier to the Toshiba TY-ASC60.
A:AnswerI haven't used it with a "Amazon dot", but it does work seemlessly with all my different Blu tooth devices.
I've used phones, tablets and even blutooth transmitter dongles. Never had an issue with disconnects or sound quality.
We mainly use this for an outside theater sound system, and everyone is impressed with it.