Thanks Mr.ToonyToon from Patid.com (audio-related forum in Thai) for recommended this video. It’s Mr. Peter Freedman, founder&president for Rode Microphones, suggests how to DIY on improving room acoustics

Though this is not a great room acoustics improvement case-study, I think it’s worth to watch. There’s another video in Rode Microphones’ Youtube channel that interest me. It’s Mr.Ken Sparkes introduces Rode Procaster, a dynamic microphone designed for voice-over. His voice in this video was recorded directly from Procaster into video camera without EQ, compression or filters

Rode Microphones : http://www.rodemic.com/
Rode Microphones on Youtube : http://www.youtube.com/rodemicrophones