Quadraphonic open reel tape
Quadraphonic open reel tape or Q4 was the first consumer format for quadraphonic sound recording and playback. Pre-recorded tapes in this format were introduced in the United States by the Vanguard Recording Society in June 1969.[1] Specialized machines to play these tapes were introduced by electronics manufacturers such as TEAC Corporation at about the same time.
History
This was a consumer, or home format based on the much larger and more expensive professional reel-to-reel tape multitrack recording systems that had been built for recording studios by 1954.[2] Professional 4-track machines used either 1 inch or 1/2 inch tape at a speed of 15 inches per second (IPS) for high quality sound.
Prices of consumer 4-track machines were rather high but still affordable. Sound quality was judged to be excellent at the time. Recordings had a relatively high signal-to-noise ratio and the tapes allowed for full 4-channel "discrete" playback with superior channel separation over the "matrix" 4-channel quadraphonic systems used on LP phonograph records. In order to keep costs as affordable as possible home machines used slower tape speeds and narrower track widths than professional machines. Home models may have also lacked professional features.
Like other quadraphonic formats it was unsuccessful and not widely adopted. Recording companies mostly stopped selling pre-recorded Q4 tapes by the late 1970s.
Use as home multitrack recorders
As the popularity of 4-channel quadraphonic home recording declined, electronics manufactures continued to manufacture the recorders for a new market. In 1972 TEAC introduced the first home 4-track recorders with Simul-Sync that were capable of overdubbing. Musicians used them as the basis of home recording studios and created sophisticated home demo recordings for the first time. Some of these recordings were also released commercially to the public. TEAC, and its TASCAM division, as well as other manufacturers sold many of these machines to musicians well into the 1990s.
Operation
All 4 tracks are used in one direction on ¼-inch tape, playing at a speed of 7½ IPS (twice the 3 3/4 IPS speed of many other consumer reel-to-reel tapes).[3][4] Quadraphonic tapes have only one music program and are "one-sided" in contrast with the 2 sides of consumer stereo reel-to-reel tapes. The special track configuration and the higher speed of pre-recorded Q4 reels means that the tape length is four times longer than a comparable stereo tape recorded at 3 3/4 IPS.
The 4 fully discrete tracks had full-bandwidth (unlike Q8 cartridges which had limited dynamic range). Q4 tapes used a faster speed and wider track width than Q8.
Compatibility
Q4 tapes or home 4-channel reel-to-reel recordings are not compatible with comparable stereo machines. When these recordings are played on stereo machines only 2 of the 4 channels can be heard at a time.
References
- ^ Curator, Museum (2013-08-11). "Quadraphonic open reel tape (Q4) (1969 – mid 1970s) | Museum Of Obsolete Media". Obsoletemedia.org. Retrieved 2016-05-16.
- ^ Cross, Lowell, "Electronic Music, 1948–1953", Perspectives of New Music 7, no. 1 (Autumn–Winter, 1968): 32–65. Citation on 50–51.
- ^ "The Official 'Factory-Made' Reel to Reel Tape Thread". Theartofsound.net. Retrieved 2016-05-16.
- ^ "Sony TC-788-4 on". Thevintageknob.org. Retrieved 2016-05-16.