I would look into room conditioning.
Placing pillows behind the speakers will give you an idea of how much benefit there is to doing it right.
If you are handy with hands, there are internet sights that will teach you how to make stuff economically.
http://www.geocities.com/jonrisch/a.htm
I do love the sound of Mac. When they break down, don't throw them away but try to fix them - half of all the macs are still playing after more than half a century!
Try not to leave them on over night - since they are old already.
If you get the itchy to upgrade, do experiment with room treatments before - I sold many components and later realised it was my room.