no bass after 6 month non-use

Are they wired in phase ? (dumb question ... but always check the obvious first)

Do they have foam surrounds that might have rotted ?

did you position them in the room exactly as they were before (you might have a listening room that creates a bass null at the listening position.

Same room? Same stands? Same orientation? Same furniture? Same treatments? Same cables? We moved a daybed out of the room once, and wondered where the bass went. Did you change anything, Oliver?

I'm not gonna lie guys, I did make some positioning changes. The difference is so drastic that I figured it couldn't be a just a positioning issue, but as with most things, it appears that I might be wrong! I'll get back to you when I've messed around with the positioning a bit. Thanks for the responses!

I've found that after moving spk. cables around they need a certain period of time for the bass/fullness to return. Strange. Also, any other wire/circuit might require a certain play time.

Sometimes too, if speakers haven't been used in a while, they may need to break in again. Not as much as if they were brand new, but may still require a little time.

I agree with Kotta. Any time I switch cables it takes several days for bass to return fully.