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Refers to the Bl product, also known as the force factor or motor strength of a loudspeaker driver. It is a key parameter used to describe the performance characteristics of a driver’s motor assembly. Bl is a measurement of the interaction between the magnetic field generated by the driver's permanent magnet and the current flowing through its voice coil. It determines the ability of the driver to convert electrical power into mechanical motion and produce sound. The Bl product is typically given in units of Tesla-meters (T·m). It is calculated by multiplying two key parameters of a given driver:
- The magnetic field strength in the voice coil gap, usually represented by the symbol "B" and measured in Tesla (T).
- The length of wire in the voice coil within the magnetic field, often represented by the symbol "L" and measured in meters (m).
BL = B × L
A higher Bl value generally indicates a more powerful motor assembly, capable of generating greater force and excursion. Drivers with higher Bl values can exhibit better control over cone movement, improved power handling, and potentially produce higher sound pressure levels for a given input power.
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