Audio and Acoustics

100 volt line ABSORPTION COEFFICIENTS acoustic filter acoustic tiles acoustic treatment Albert Hall Ambiophony Ampex amplifier audio bass broadcasting c/s region cabinet ceiling chapter circuit concert hall cone resonance cu.ft delay density disc echo effect enclosure equipment Festival Hall fibreglass floor follows frequency range give gramophone hear Helmholtz Resonator hi-fi Holywell Music Room illustrated in Fig impedance interesting James Moir kc/s listening room loudspeaker low frequencies magnetic membrane absorbers microphone mono mounted moving-coil speaker noise ohms orchestra output performance photograph piano pickup pipe produced programme radio reduced reflecting reproduced resonance frequency reverberation Royal Albert Hall Royal Festival Hall shown in Fig shows signal sound absorbing material sound absorption sound level Sound Reproduction sound source stereo studio tape recorder thick tone transformer transient transistor transmission tuned voice coil volume control wall watts waveform Wigmore Hall Wireless World