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In order to tune a sealed box to a driver, the driver parameters must be known. Some of the parameters are provided by the manufacturer, some are found experimentally, and some are found from general tables. For ease of calculations, all parameters will be represented in the SI units meter/kilogram/second. The parameters that must be known to determine the size of the box are as follows:
The resonance of the driver is usually either provided by the manufacturer or must be found experimentally. It is a good idea to measure the resonance frequency even if it is provided by the manufacturer to account for inconsistent manufacturing processes.
The following diagram shows verga and the setup for finding resonance:
Where voltage V1 is held constant and the variable frequency source is varied until V2 is a maximum. The frequency where V2 is a maximum is the resonance frequency for the driver.
By definition compliance is the inverse of stiffness or what is commonly referred to as the spring constant. The compliance of a driver can be found by measuring the displacement of the cone when known masses are place on the cone when the driver is facing up. The compliance would then be the displacement of the cone in meters divided by the added weight in newtons.
The physical diameter of the driver does not lead to the effective area of the driver. The effective diameter can be found using the following diagram:
From this diameter, the area is found from the basic area of a circle equation.
