System bottleneck?

But to be specific I am always looking for better clarity, bigger soundstage and more separation of instruments.

Boy aren't we all. Your system looks good on paper. What about a pair of subs, that will really change things. I'd also would want to see your set-up just to make sure you have it located well. 

artemus_5 
I guess I did not think there would be much of a difference whether I streamed through phone or directly on the marantz. I have not looked into going direct but I will figure out how. I guess I also thought I needed an app to stream from and I’m not sure how the marantz accomplishes that on its own. I need to do some digging. Thanks for the suggestion. 
 

russ69 the signature se’s have pretty good bass response. I would even say excellent. Having said that a pair of subs would probably help the sound above and beyond the extra bass. Thanks for that thought.

Tablejocky No doubt!

Agree with most above. If streaming by bluetooth, correct that immediately. Especially if this is your primary source.

Secondly, new turntable. You didn't mention your phono preamp, maybe that too.

Can you elaborate please? Are you streaming from the internet to your phone and then bluetooth to your Marantz? Do you have a server on a home ethernet/wifi network?