Online acoustic suspension enclosure calculator to find the Speaker Box Internal Volume, 3dB Cutoff Frequency and Enclosure Resonant Frequency by entering Equivalent Volume, Free Air Resonance, Total Q, Actual System Q, Effective Cone Diameter and Resonance Frequency. Loudspeaker enclosure is a box shaped enclosure in which speaker drivers and related electronic hardware such as cross circuits, power amplifiers are mounted. Acoustic suspension decreases the bass distortion in conventional speakers.