Want to setup basic home audio system

  +1 panzrwagn
Regarding using Blu-tac for mounting stand mounts. That was my former go to for putting stand mount speakers on stands, brilliant stuff and helps stop ringing.

@diripio...Similar, yes. But in this case, more focused on 'distilling' uniform response from the speakers in your space.

The fact that it's nearly square can create 'issues'.  You don't note the ceiling height; assuming it's the 'typ. 8' h.' makes it easy to 'overdrive' the space.
You might as well sit inside the woofer's enclosure....I'm not surprised the Marshall 'rules the room', even at low levels...
They do that.... ;)
Better to concentrate on uniform response at lower levels; you'll be surprised at the details that easily get 'blown away' and missed.

Some room treatment ought to be in your future.  Refer to the forums and the websites that deal with that, and listen carefully to the room as you proceed.
Some here will claim that the space is half the equation.
In a small room...they're right, but best approached with patience.

You will have to listen like you've never attempted before.
Don't stress over it....this is supposed to be fun, after all.  ;)

Have @ it, J

bob540: 
I see a lot of people selling kef q50’s and q80’s near me. Sadly, no q550’s though. I have seen the ls50’s recommended a lot on reddit. Maybe I should call one of the listing just to hear kef speakers. 
panzrwagn & rixthetrick:
wont forget to pick up some blue-tac! Good call!

asvjerry:
The details are what I want! I believe someone posted on this thread a website that sells room treatment panels. That is definitely something I will look into when I get the chance! You don’t suppose they sell the mic used??

Diripio, congrats on the NAK purchase. let us know what you think of the speakers you demo.

Re panels, you can easily make your own. Check out ATS Acoustics online.They make them and sell supplies for DIY.  I purchased the Roxul Rockboard and burlap fabric from them  (might find the roxul and fabric locally) and made frames from 1x3" pine.  

Placing panels behind speakers, at reflection points on right and left wall, and behind listening position works well for me. My room is 12.5' by 14.5'. May need bass traps in a couple corners as well.  
The amount and nature of room treatment is, like speakers, a matter of room interaction and personal preference. 

I can throw in a "mic", It's basic but will work for room correction.
"Just do not attempt a new, world class recording of say, (Blackbird)!"
 Yeah, like "Mesch" say's- Make your own panels. Which isn't only much more affordable but also easier to get that really high, "WAF" score. This by matching them to your decorum!
 With "At times", the "WAF" being the most important factor of all!
Unless you really do like sleeping on that couch!

In case anyone didn't notice- That post about the shipping was of course a joke. I ship "always", as if it is mine. Going to me. Similar to the way McIntosh learned me up about it long ago..... The plywood bolted to the footer. threads. With "Nothing" touching the component on any of the six sides! The plywood braced to the box sides with closed cell foam in the corners of both the inner and outer boxes. Utilizing the appropriate wear grade and crush-strength rated plies of cardboard and paper shipping tape as well.
 Expensive? Yes!
But it is;
"Failsafe".
And USPS? Never again.....
 UPS marked with stickers- "Live Bull Semen". "Handle with care". And a 1-800 number, over which it say's, "In case this parcel is found to be leaking, and/or exhibiting an odd odor. Please Call 1-800-XXX-XXXX. DOT Hazmat #XX-XXXXX".

Works for me.