CEA Speaker Systems & Amplification 2

Question 1

A speaker has a sensitivity of 100 dB SPL (1W/1m). What SPL is produced at 1 meter when driven with 100 watts?

Accepted Answer

120 dB

Answer

110 dB

Answer

130 dB

Answer

140 dB

Question 2

What is the primary sonic advantage of bi-amping a two-way speaker system?

Accepted Answer

Each amplifier handles only its frequency band, reducing intermodulation distortion

Answer

It eliminates the need for any crossover network

Answer

It doubles the speaker cabinet's maximum SPL output

Answer

It allows two mismatched speaker brands to work together

Question 3

Reversing the polarity of one speaker in a stereo pair most noticeably causes:

Accepted Answer

Bass cancellation and a diffuse, unfocused stereo image

Answer

Increased high-frequency brightness

Answer

Higher overall SPL output

Answer

Increased distortion at high playback levels

Question 4

How does a ported (bass reflex) cabinet differ from a sealed cabinet in terms of low-frequency behavior?

Accepted Answer

Its tuned port extends low-frequency output below the driver's natural resonance

Answer

It uses a passive radiator instead of a woofer cone

Answer

It requires less amplifier power for the same midrange SPL

Answer

It eliminates the need for a low-frequency crossover

Question 5

What does the horizontal dispersion specification of a loudspeaker describe?

Accepted Answer

The angular range over which the speaker maintains consistent frequency response in the horizontal plane

Answer

The number of discrete audio channels the speaker can reproduce

Answer

The distance at which SPL drops 6 dB below the on-axis measurement

Answer

The maximum horizontal tilt angle before acoustic feedback occurs

Question 6

Amplifier headroom is best defined as:

Accepted Answer

The margin in dB between the normal operating level and the onset of clipping

Answer

The physical rack space above the amplifier in a touring case

Answer

The frequency range above 10 kHz that the amplifier reproduces cleanly

Answer

The minimum speaker impedance the amplifier can safely drive

Question 7

When integrating a subwoofer with full-range speakers, the crossover point is most commonly set in which frequency range?

Accepted Answer

60–120 Hz

Answer

20–40 Hz

Answer

200–400 Hz

Answer

800 Hz–1 kHz