I'm guessing from the opening post that the OP has a living situation where he has to accommodate others and keep his volume levels in check all or most of the time ...That's where this post is gonna be coming from ...
I had hit a brick wall trying to figure out what I can do in my situation since I'm in that situation at my current apt ....
A few quick opinions here on how I solved my situation ...
I didn't think that throwing money at plugs and hoping that would solve my situation was the right answer for me .
Why ? because I have plenty of excellent plugs already in what came with SONAR and my 3 rd party purchases ..
My living space is totally untreated so the moment I turn the music up I may be fighting with my own living space with out the benefit of really hearing what the plugs will add as they would in a treated room
I wound up tracking a lot with a very decent set of headphones and running my powered studio monitors at mouse whisper volumes ...
Yeah sure, the headphones were great for editing yet I did not trust them at all for my journeys in creating my sounds one bit ...I'm looking to get my sounds out of my head and into the world ..
I ruined a lot of my mix's trying to mix w headphones only . My powered monitors I had better luck with , yet even then I could never run them long enough at the times of the day and nights I love to record and mix .
I always had to pick and choose my times mixing through my monitors wisely due to having working people and small children as my neighbors on all sides ...
Then to add insult to injury , even after getting to use my studio monitors to record and mix , when I was done I would chill out and watch a little TV with my pooch and my TV had much better sounding sounds coming out it it ...I was Like WTF Universe what are you trying to tell me here ...

Then I remembered for every problem there is , there is also the seed of the solution contained already within the problem

Eventually I found a solution that works for me .I'm not sure if it's gonna be of any help to the OP , but hey I may as well state it here ..it may be of help to someone else .
I went out and bought a small rectangular USB powered Bluetooth w 2 internal speakers that has an aux input ...
I didn't want to run Bluetooth only , I wanted to run the speakers aux in from my sound cards headphone out ..
(my sound card for PC is a Focusrite 2i4 ...)
This little guy charges VIA USB and once it's charged it lasts between 4 or 5 hours ...
I'm shocked at how much functionality this solution has brought in to my music & recording time ..
I've always stayed mono up until the final phases of song mixing . I actually prefer to use the little BT speakers over my powered monitors for setting my levels and carving EQ's ...
Of course it goes with out saying that yes I will check the mix out with the monitors at some point ...
the thing is I have gotten much better results using this as opposed to just using the studio monitors only ...
Why has this been so ? these speakers can be very loud and yet they are much closer to what the average persons listening environment is ...this has actually helped me in a few areas ...
I'm not making enough noise for any one to complain , it sounds like I'm listening to the TV outside my pad ...
I have check out tunes I have mixed before using this little rig and the mix's did not translate well being played over my chomebooks speakers or cell phone ...
In contrast the mix's I have done with the BT speakers have sounded very decent certainly within the ball park for those type of listening mediums ...
As an added side benefit I can dial up some amp sims in SONAR and get a pretty decent little sound going on for practice ..not loud enough to play over drums , certainly loud enough to jam with a group of players while working out song parts ...
all the best ,
Kenny