Equalization is usually the key. The hollowness is caused by certain frequencies of sound being emphasized by the acoustic properties of the room. Usually, reflections in the room will increase certain frequencies and decrease others. The first thing is find the frequency that is overly loud and reduce that. Then, attempt to judge what is missing from the audio. Finally, a little noise reduction can help. I would work in Soundtrack Pro.
Final Cut Pro 6.0.5, Mac OS-X 10.5.5, Quicktime 7.5.5, Adobe Prod Prem CS4, G5 Quad 2.5, Kona-LHe V6, 8.5GB RAM, Nvidia GeForce 7800-GT 256MB, G-RAID 2x1TB FW800, 6TB RAID-5 (Enhance E8-ML, Highpoint 2322), Panasonic HVX-200P P2. Also MBP 17″ Core 2 Duo 2.5, 4GB, GeForce 8600M GT 512MB.