better late than never? In Audition v2.0 I did this to get a good effect (in this order):
1. Filters>FFT Effects>use the 'telephone receiver' preset
2. delay>reverb>either "bigger room ambience" or "resonant room mode" preset
3. tempo/pitch>pitch shift>up or down th epitch if you want just to deepen/heighten the speaker's voice (ie to taste)
4. filters>grapghic Equalizer>increase the 1K, 2K, 4K ranges slightly (again, to taste)
5. amplify as necessary
Basically you are trying to get a sound like an amplified telephone broadcast over a slightly tinny PA system in a very big, echoey room. Altering the pitch in step 3 will make the sound more or less 'tinny'