Sound amplification by stimulated emission of radiation of the laser. In a SASER device, a source (e.g., an electric field as a pump) produces sound waves (lattice vibrations, phonons) that travel through an active medium. In this active medium, a stimulated emission of phonons leads to amplification of the sound waves, resulting in a sound beam coming out of the device. The sound wave beams emitted from such devices are highly coherent. The first successful SASERs were developed in 2009. Instead of a feedback-built wave of electromagnetic radiation (i.e., a laser beam), a SASER delivers a sound wave. SASER may also be referred to as "phonon laser",
A Web of Sound listening to them is humming in a room where another dozen people are humming also, in a constant pitch, never varying, unchanging." Allmusic's Joe Viglione suggested that "A Web of Sound" also influenced such artists as Iggy Pop and The Stooges and Alice Cooper. Stewart Mason, also of Allmusic, remarked that the album blended "the snotty aggression of ["The Seeds"] a bit with some heavier psychedelic flourishes." Writer Malcolm Russell described "A Web of Sound" as being "more adventurous" than the band's debut album, and said it "brimmed with scratchy mid-60s classics." Don Jacobson of "The Beachwood Reporter" called it