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In 1993, the W6-series subwoofer drivers are introduced in 8, 10, 12 and 15-inch sizes. This product was considered unique for its dual 6-ohm voice coil system design. These subwoofers were in production for ten years. In 1994, JL Audio introduces the W4 and IB4 series subwoofers and infinite baffle woofers. Also introduced were the CS-3 ...
Dual began producing turntables under that name the same year. [1] [2] After World War II, Dual became the biggest manufacturer of turntables in Europe, with more than 3,000 employees working in several factories. Throughout the 1970s, 1980s, and 1990s, Dual introduced audio cassette players, VCRs, CD players, and other consumer electronics.
The auditory threshold is taken to be 10 –12 W/m 2 (which corresponds to a pressure level of 20×10 −6 Pa). Therefore a speaker with 100% efficiency would produce an SPL equal to 10log(0.159155/10 –12), which is 112.02 dB. The SPL at 1 metre for an input of 1 watt is then: dB (1 watt) = 112.02 + 10·log()
A tiny coffeehouse may only need a single 10-inch subwoofer cabinet to augment the bass provided by the full-range speakers. A small bar may use one or two direct-radiating 15-inch (40 cm) subwoofer cabinets. A large dance club may have a row of four or five twin 18-inch (45 cm) subwoofer cabinets, or more.
A DBA requires at least two subwoofers (preferably same make and model) that are placed at opposing walls in a specific layout. The signal played by the subwoofer array on the back wall is inverted and delayed based on the distance to the frontal subwoofer array. This will actively "absorb" any reflected sound.
Chuck McGregor recommended a rule of thumb in which the amplifier's maximum power output rating was twice the loudspeaker's continuous (so-called "RMS") rating, give or take 20%. In his example, a loudspeaker with a continuous power rating of 250 watts would be well-matched by an amplifier with a maximum power output within the range of 400 to ...
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