Audio Engineering

722 Chapter 24 At or above the highest usable frequency, the impedance rise is again inductive. It represents the effects of the ...

Loudspeaker Enclosures 723 of the latter, extra parts may be added to create a conjugate crossover, which makes the overall load ...

724 Chapter 24 impedances is a major failing with power amplifi ers having low or nil global negative feedback, and the outcome ...

Loudspeaker Enclosures 725 1 kHz. The traditional, simplistic “ damping factor ” takes this ideal impedance at a nominal point ( ...

726 Chapter 24 to, after it has traversed a given speaker cable and passed through an ideal 10,000- μ F series capacitor, as fi ...

Loudspeaker Enclosures 727 20 2WPXORZ1.CIR Temperature  27 10 Ohms 5 (^220100) 1 K v(1) Frequency (Hz) 10 K 20 K Impedance of 2 ...

728 Chapter 24 24.2.3 What Passive Crossovers Look Like to Amplifi ers For conventional full-range loudspeakers with passive cro ...

Loudspeaker Enclosures 729 In the crossover’s pass band where there should be no (attenuative) action on the signal voltage at a ...

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Headphones Ian Sinclair Not all sound reaches us through loudspeakers, and the advent of the Sony Walkman has led many listeners ...

732 Chapter 25 were largely relegated to the world of communications, where they stayed until the mid- 1950s, when they underwen ...

Headphones 733 This “ dummy head ” -recording technique effectively ensures that each listener’s ear receives a replica of the s ...

734 Chapter 25 signals feeding two front-positioned loudspeakers to give an all-round effect, with sounds appearing to come from ...

Headphones 735 25.3.2 Moving Coil Moving-coil headphones ( Figure 25.3 ) work in exactly the same way as moving-coil loudspeaker ...

736 Chapter 25 Acoustic damping materials Voice coil (on cylindrical former) Magnet and pole pieces S S N N Diaphragm Motion Wir ...

Headphones 737 Moving-coil headphones are essentially medium- to low-impedance devices with impedances between eight and a few h ...

738 Chapter 25 25.3.4 Electrostatic The electrostatic headphone, like the electrodynamic, uses a thin plastics diaphragm, but in ...

Headphones 739 diaphragm are all chosen carefully so that the fi lm does not collapse on to either plate. Instead it stays in a ...

740 Chapter 25 (a) Figure 25.6 : (a) Jecklin Float PS-2 electrostatic headphones and energizer unit, (b) Jecklin Float electrost ...

Headphones 741 25.3.6 High Polymer High polymer is basically a generic name to cover piezoelectric plastics fi lms such as polyv ...