Is the dropped ceiling separate from the floor above and, if so, is there any way that you
could replace the ceiling? Alternatively, you could remove the underside of the existing
ceiling, mount joists between and slightly below the existing joists and then mount a
layer or two of plasterboard on these joists to form a separate structure from the
existing floor.
James.
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JRP Music - Audio Mastering and Restoration.
http://www.jrpmusic.net