• Acoustics and Vibration Animations, list of articles and demonstration by Dr. Daniel Russell
  
• Acoustic High-Pass, Low-Pass, and Band-Stop Filters, Daniel Russell discusses propogation of sound through ducts, transmission lines and acoustic filter chambers
  
• Superposition of Waves, shows the interaction of standing waves
  
• Radiation from a Baffled Piston, shows the effects of frequency on directivity
  
• Evanescent Modes in Waveguides, shows higher order modes in ducts driven above and below their cutoff frequency
  
• Mass-Spring Systems with Damping, shows how system damping affects resonance amplitude, which in turn affects response
  
• The Forced Harmonic Oscillator, shows systems driven below resonance, at resonance and above resonance
  
• Coupled Oscillators, shows two mass-spring systems, like the mechanical resonance of a loudspeaker and the acoustic resonance of the cabinet
  
• The Dynamic Vibration Absorber, shows how two tunes systems can be optimized for working together. Think speaker and box.
  
• Vibrational Modes of a Circular Membrane, shows cone flex breakup modes
  
• HyperPhysics - Resonance, several links on the subject
  
• HyperPhysics - Air Column Resonance, online calculator of open pipe, closed pipe and tapered pipe resonant modes
  
• HyperPhysics - Cavity Resonant Frequency, online calculator of Helmholtz resonant frequency
  
• Resonance, standing waves, & Eigentones, discussion of resonance and Q
  
• Air Column Acoustics, a description of wave propogation in pipes and conical sections
  
• Musical Acoustics - Some Introductory Pages, several links about matters acoustic from the University of New South Wales
  
• Pipes and Harmonics, University of New South Wales, compares closed cylinder pipes, open cylinder pipes and closed conical pipes
  
• Helmholtz Resonance, University of New South Wales, describes Helmholtz resonance
  
• Sound Waves and Music, several online lessons from the Physics Classrom
  
• Resonance and Standing Waves, Physics Classroom
  
• Standing Waves and Resonance, describes standing waves in mechanical, electrical and acoustic transmission lines
  
• Resonata, a groovy applet

Thanks for the effort! Here's my fave animations for BR driver/vent interaction:

GM

• BR explained