Exploring Common DIY Terminology - Re

Re (Thiele/Small Parameter)

Re refers to the DC resistance of the driver. It represents the electrical resistance encountered by the audio signal as it passes through the voice coil. This has important implications in loudspeaker design:

• Power handling: Re affects the power handling capabilities of the loudspeaker. As the audio signal passes through the voice coil, it encounters electrical resistance, causing a voltage drop and generating heat. A lower resistance value (lower Re) allows for higher power handling capacity, as less power is dissipated as heat. On the other hand, a higher resistance value (higher Re) results in lower power handling capability.
• Impedance curve: Re is a component of the loudspeaker's impedance curve. It is typically the DC resistance measured at room temperature. The impedance curve represents the loudspeaker's resistance and reactance as a function of frequency. Re contributes to the resistive component of the impedance, particularly at low frequencies, where its impact is more significant.
• Crossover design: Re is an essential parameter in loudspeaker crossover design. Crossovers divide the audio signal into different frequency bands and direct each band to the appropriate loudspeaker driver. The DC resistance of the voice coil, along with other electrical and mechanical parameters, influences the design and performance of the crossover network. Accurate knowledge of Re helps in impedance matching and designing an efficient crossover system.

Re contributes to overall system performance and must be taken into account when designing loudspeaker enclosures, calculating power requirements, and assessing compatibility with other audio equipment.



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