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Section 28 · Gadgets

Audio

The essentials

Checked against High fidelity.

01
High fidelity
high-quality sound reproduction with inaudible noise, distortion, and a flat frequency response
02
Lo-fi
lower-quality sound from inexpensive equipment, AM radio, or recordings made before the late 1940s
03
Post-WWII innovations
reel-to-reel tape, 33 1/3 rpm LPs, FM radio, and improved amplifier designs
04
Golden Age of Hi-Fi
period in the late 1950s and early 1960s defined by vacuum tube equipment
05
Integrated music centers
1970s systems combining turntable, tuner, tape player, and amplifiers in one unit
06
Modular components
separate pieces like preamplifiers, power amplifiers, tonearms, and turntables
07
ABX test
blind testing method used to determine if a difference exists between two samples
08
Human hearing range
20 Hz to 20,000 Hz for healthy young persons
09
Compact disc (CD)
provides approximately 90 decibels of dynamic range
10
Monoblock
monophonic power amplifier often used for powering a subwoofer
11
Signal modification equipment
includes equalizers and noise-reduction systems
12
Modern connectivity
TOSLINK, S/PDIF, USB, HDMI, Bluetooth, or Wi-Fi support