**Design of loudspeaker enclosures: closed box**

*Castells Ramón, Francisco Sales*

Introduction:

This virtual lab represents the curve of a closed-box design from the electromechanical parameters of a driver, its maximal ratings (including maximum linear displacement and maximum electrical power) and box parameters.

Objectives:

For a given speaker, investigate the effect of parameters involving closed-box loudspeakers

Instructions:

~The user should introduce two sets of parameters related to the driver and the configuration of the box:

DRIVER PARAMETERS:

R_{E}: Electrical Resistance

Bl: Force Factor

C_{MS}: Mechanical Compliance

M_{MS}: Moving Mass

R_{MS}: Mechanical Resistance

S_{D}: Effective Radiating Surface

X_{max}: Maximum linear excursion

P_{E}: Peak Electrical Power (considered as 4 times continuous AES Power)

BOX PARAMETERS:

V_{B}: Physical Box Volume

γ: Coefficient by which the apparent Box Volume is increased (γ range between 1.0 and 1.4)

Q_{A}: Quality Factor due to Absorption within the Damping Material

Q_{L}: Quality Factor due to Leakage

After introducing the required parameters, the virtual lab represents the frequency response of the box for maximum achievable SPL.

The virtual lab represents the following curves:

- Frequency response of the box

- Information of performance parameters: f_{6}, SPL_{max}, maximum input power and Ripple in dB

- Other parameters related to the closed-box: Q_{TC}, f_{c} and α

- Peak cone displacement as a function of frequency (X_{max} is also shown as a reference)