Roxana Saberi is an American journalist of Iranian and Japanese descent who was convicted of spying in Iran -http://freeroxana.net. On Public TV tonight, two 'experts' said that the best way to pressure Iran is through public pressure. Please do what you can to contribute to the voices of US citizens calling for Iran to release Ms Saberi immediately.
Monday, April 20, 2009
Sunday, April 05, 2009
Grateful Dead’s “Wall of Sound”
While poking around looking for some details on Grateful Dead CD’s I ran across this article about the Dead’s legendary “Wall of Sound”… almost 100 amps pushing 24,400 watts. Wish I’d heard one of those performances.
The below is quite for Wikipedia.
The Wall of Sound was an enormous sound system designed specifically for the Grateful Dead.[53][54] The band was never satisfied with the house system anywhere they played, so in their early days, soundman Owsley "Bear" Stanley designed a public-address (PA) and monitor system for them. Stanley's sound systems were delicate and finicky, and frequently brought shows to a halt with technical breakdowns. After Stanley went to jail for manufacturing LSD in 1970, the group briefly used house PAs, but found them to be even less reliable than those built by their former soundman. In 1971, the band purchased their first solid-state sound system from Alembic Inc Studios. Because of this, Alembic would play an integral role in the research, development, and production of the Wall of Sound. The band also welcomed Dan Healy into the fold on a permanent basis that year. Healy, considered to be a superior engineer to Stanley, would mix the Grateful Dead's live sound until 1993.
The Wall of Sound fulfilled the band's desire for a distortion-free sound system that could also serve as its own monitoring system. After Stanley got out of prison in late 1972, he, Dan Healy and Mark Raizene of the Grateful Dead's sound crew, in collaboration with Ron Wickersham, Rick Turner, and John Curl of Alembic combined eleven separate sound systems in an effort to deliver high-quality sound to audiences. Vocals, lead guitar, rhythm guitar, and piano each had their own channel and set of speakers. Phil Lesh's bass was piped through a quadraphonic encoder that sent signals from each of the four strings to its own channel and set of speakers. Another channel amplified the bass drum, and two more channels carried the snares, tom-toms, and cymbals. Because each speaker carried just one instrument or vocalist, the sound was exceptionally clear and free of intermodulation distortion.
Moreover, the Dead's Wall of Sound acted as its own monitor system, and it was therefore assembled behind the band so the members could hear exactly what their audience was hearing. Because of this, Stanley and Alembic designed a special microphone system to prevent feedback. This placed matched pairs of condenser microphones spaced 60 mm apart and run out-of-phase. The vocalist sang into the top microphone, and the lower microphone picked up whatever other sound was present in the stage environment. The signals were added together, the sound that was common to both microphones (the sound from the Wall) was cancelled, and only the vocals were amplified.
The Wall of Sound consisted of 89 300-watt solid-state and three 350-watt vacuum-tube amplifiers generating a total of 26,400 watts RMS of audio power. This system projected high quality playback at six hundred feet with an acceptable sound projected for a quarter mile, at which point wind interference degraded it. The Wall of Sound was the largest portable sound system ever built (although "portable" is a relative term).[citation needed] The Wall of Sound comprised two stages. One would go ahead to the next city to begin setup as soon as possible while the other was being used; the other would then "leapfrog" to the next show. Four semi-trailers and 21 crew members were required to haul and set up the 75-ton Wall.
Though the initial framework and a rudimentary form of the system was unveiled in February 1973 (ominously, every speaker tweeter blew as the band began their first number), the Grateful Dead did not begin to tour with the full system until a year later in 1974. The Wall of Sound was very efficient for its day, but it suffered from other drawbacks besides its sheer size. Synthesist Ned Lagin, who toured with the group throughout much of 1974, never received his own dedicated input into the system, and was forced to use the vocal subsystem. Because this was often switched to the vocal microphones, many of Lagin's parts were lost in the mix. The Wall's quadraphonic format never translated well to soundboard tapes made during the period, as the sound was compressed into an unnatural stereo format and suffers from a pronounced tinniness.
The rising cost of fuel and personnel, as well as friction among many of the newer crew members (and associated hangers-on), contributed to the band's 1974 "retirement." The Wall of Sound was disassembled, and when the Dead began touring again in 1976, it was with a more logistically practical sound system.
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