Acoustic issues are usually pretty easy to remedy. If you're interested, start by building some 8" thick Rockwool bass traps and put them in the corners. Make the frames out of 1x10 rough lumber. Should be around 8' high for a garage but work best if they go to the ceiling. The difference will blow you away.
If you ever want to do a decent acoustic treatment so you can really enjoy your gear. pm me and I'll walk you through it. And yeah, you can do a good job for little money.
I stacked them with the tweeters together. (Top pair upside down putting the tweeters close together) Seemed to tighten up the imaging. I would have to convince the wife there was some other reason other than acoustics to do a treatment. Mouse repelling treatments?... LOL.
Or you can just buy acoustic panels that are now inexpensive. If you know what standing waves you want cancelled and/or know what amount of silence in the audio spectrum, you can order to suit your needs.