Cinder block listening room-Acoustics Forum-Acoustic Fields Forum

I have a spare basement room less than perfect but am going to work with what I have.
At present it measures 16Lx10.5Wx8.5H its a concrete floor and cinder block wall, it was drywall lined and was fairly quite as its semi underground.
I know the ceiling is lower than desired and I am going to but the concrete floor at the first point of reflection and install an absorptive pit, has anyone had any experince with a pit, how did it work
good or bad I also have the opportunity to lengthen the room by another 4 feet by removing a window and pushing 1 wall out further that would make it 20Lx10.5WX 8.5H with an absorptive pit.
I’m wondering if the longer room will be better while I have the chance or leave it alone.
No dennis I haven’t taken any readings just yet.