CAT Amplifiers and Loudspeakers Flashcards

What type of amplifier topology is most commonly used in modern high-power commercial audio amplifiers due to efficiency?

Answer: Class D (switching)

Class D switching amplifiers can achieve efficiencies above 90%, making them the dominant choice for high-power commercial applications where heat management and power draw are concerns.

What is the significance of a loudspeaker's Thiele-Small parameter Fs?

Answer: The free-air resonant frequency of the driver

Fs is the free-air resonant frequency where the driver cone oscillates most easily; it is fundamental to enclosure design calculations.

When bi-amping a speaker system, which driver typically receives the amplifier with higher power output?

Answer: The low-frequency (woofer) driver

Woofers require significantly more power to move air at low frequencies, so the high-power amplifier channel is assigned to the LF driver in an active bi-amp configuration.

What does the term 'impedance dip' refer to in loudspeaker specification?

Answer: A frequency at which the speaker impedance drops below its nominal rated value

An impedance dip is a frequency region where the speaker's impedance falls below its nominal rating, potentially causing the driving amplifier to deliver more current than intended.

What is the function of a limiter in a commercial amplifier or processor?

Answer: To prevent the amplifier output from exceeding a set ceiling to protect speakers

A limiter clamps the signal at a defined maximum level to prevent clipping and excessive power that could damage loudspeaker voice coils.

In a line array system, what acoustical behavior occurs when individual elements are properly coupled?

Answer: Cylindrical wave propagation with slower SPL loss over distance

When line array elements are closely spaced relative to wavelength, they sum coherently and radiate as a cylindrical wave, losing approximately 3 dB per doubling of distance instead of 6 dB.