An unusual problem

Buy an Auralex Sub Dude isolation platform.  I've had one for years ...not only does it improve the sound but it eliminates many rattles associated with having a sub.  My mom had been complaining that my dad's sub was boomy and keeping her up....  he's 76 so sometimes movies are a little louder than they should be.  He says "does anybody ever say turn it down at the theater?"   Touche, I guess.  Anyway  I went over there one Saturday when he wasn't home and slipped a sub dude under the sub and ran the Anthem room correction software again and it's never sounded better.  Boominess is gone and you don't feel it in other rooms now unless it's loud.  One of the greatest accessories ever.

I have a Subdude in my bedroom.  I live in a house, but my neighbor's house is not too far away.  I think it helps a little, I never went outside with my SPL meter to see if it made a difference or not.  Eventually I just quit using the sub in there.  They never complained, but I was trying to be proactive.

There's this thing called consideration that you can get for free.  If you live in a box right next to someone in another box, don't play your music loud after 10 PM.  Headphones are a good suggestion.  That's what I do late at night.

bass waves are so long that they penetrate easily. best suggestion I read was just go to headphones at night....harmony with your neighbor is important.

I actually just got rid of an awesome REL simply because it provided a 15% gain in sound quality for me and a 75% gain in irritation for my room mate.  
I’d look into finding enjoyment in a set-up that doesn’t bother your neighbors.  Sell the sub and put that $ into upgrading the transparency, resolution  and musicality of your set-up!

Magnepans might be something to consider as I’ve heard that they don’t transmit bass through walls quite like conventional box speakers.  Magnepans are more directional so they may not sound quite as good when walking around your loft but that directionality may help you out as well since it sounds like you have glass along the entire 1 side of your listening area.

Good Luck!

I actually just got rid of an awesome REL simply because it provided a 15% gain in sound quality for me and a 75% gain in irritation for my room mate.

 

So there you have it- REL: the sub so good even when its bad its because its so good.

There's next to zero chance this will work but just in case the wall is super thick concrete or whatever and the glass really is where all the sound is coming through.... 

Bass is making the window pane vibrate like the skin of a drum. You can stop that with a bead of silicone all along the wall/glass corner. But that will mostly stop the glass rattling against the wall. Which will be an improvement for sure. 

But then the window pane will still be vibrating, only now the wall will be like a pivot point. The easiest cheapest most unobtrusive thing you can do is glue a 2x2 into that corner all the way floor to ceiling. 

Try the silicone first, that will at least stop the rattle and give you a clue if anything else is even possible.