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Transmission line

A long damped path behind the driver.

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Why it matters

A transmission line is not just a folded box.

It can give controlled low-frequency support and reduce some rear-wave problems, but it is sensitive to layout and damping. A poor line can create uneven bass and midrange leakage through the vent.

How it works

The rear wave travels down a long path inside the cabinet. The line is often related to a quarter wavelength near the target low-frequency region. Stuffing slows and damps the wave, while taper changes how energy moves through the line.

The line exit can add output at low frequencies. At higher frequencies, the line should absorb or suppress rear-wave energy so it does not leak out as coloration.

Common mistakes

Simple example

Why a box matters A driver radiates from both sides out of phase. Without an enclosure the rear wave cancels the front, gutting the bass. The box stops that and controls low-frequency behavior. Sealed vs ported A sealed box traps the rear wave in an airtight cabinet. A ported box uses a tuned vent to add bass output around tuning. Frequency response Frequency response shows how loud a speaker is at each frequency. It helps reveal balance, crossover behavior, box tuning, and room problems. Speaker parameters Speaker parameters are measured driver values. They describe resonance, electrical load, moving mass, compliance, motor strength, sensitivity, excursion, and safe power.

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