A few companies, including Victor Talking Machine Company and Pathe, produced evidence players using compressed-air loudspeakers. However, these designs were significantly circumscribed by their poor robust endowment and their inability to reproduce firm at low volume. Variants of the ideology were fanatic for government address applications, and extended recently other variations have been hand-me-down to assessment area equipment resistance to the very loud robust and vibration levels that launching rockets produce.
Designers can benefit an anechoic chamber to ensure the speaker can be measured independently of capacity effects, or any of several electronic techniques which can, to some extent, replace such chambers. A few of the issues speaker and driver IPOD Speaker System designers must confront are distortion, lobing, phase effects, off axis response and crossover complications.