As I understand it, you can use Alexa to access music from radio stations or other sources, but you can export the sound to any wired or wireless speaker. So, I don't think it is "Alexa sound". Alexa is just an app where you can use your voice to access music sources. I have Alexa on my Windows laptop, but any music that I ask Alexa to play will play through my laptop speakers or any other speakers that I choose to plug in to my laptop.

Alexa is just software.
That's why I said Alexa units.......Amazon/Alexa units do not produce great sound.
Dots, Echos, etc.

Hopefully you understand now.

Good news. I now understand it. You are not a big fan of the speakers made by Amazon. But, they keep trying with bigger and better speakers. So, keep an open mind.

Spotify
 

We have a Spotify family subscription which we share with all our kids. $15.99 a month and 6 people can use it separately.
We have used Pandora, Amozon and Google music and Spotify is by far the best music streaming app on the market. They have every song I have ever searched for and the quality is awesome.
We also purchased a Sony SRS XB33 speaker. We have used the JBL version but they kept failing.
When we sit out in our Lanai we just bring our Bluetooth speaker out with us.
We also bring it in our golf cart and at the pool. It's also waterproof.