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Test Bench Two Pro Sound Drivers and a Home Audio Midwoofer By Vance Dickason T he transducers submitted to Test Bench this month came from Celestion, Dayton Audio, and B&C Speakers. Celestion submitted the 3.5" AN3510 from its new series of line source drivers. Dayton Audio submitted the PM220-8, which is a wideband (full-range) neodymium 8" woofer. B&C Speakers provided this month's third driver, the DE980TN-8—its latest high-performance titanium diaphragm neodymium compression driver— with a ME90 horn. The AN3510 Celestion has a particularly rich history in pro sound as well as home hi-fi. In the 1960s, Celestion manufactured the industry's first dedicated guitar speaker, the Celestion Blue (think VOX AC-30). In the 1980s, Celestion developed the Aerolam honeycomb SL600 enclosure. Celestion started out in Hampton Wick (a London, UK, suburb) in 1924. Celestion Radio and Celestion were formed in 1927. Two years later the company moved across the River Thames to Kingston. The company grew T i t a n i u m P r e c i s i o n A c Measurement Mic System P c e 7052E h l IEC61094-4 Compliant e Titanium Diaphragm a 4 Hz to >25 kHz r <16 dBA >135 dBSPL* o n m 4048 Preamp t e Stainless Body t Phantom o e <18Vdc to >56Vdc m r s, to Superior M Long-term I i Temp and Humidity c Stability E s Operational <-20C >70C Storage <-30C >85C P & E m 3-4 mA o r 7052PH/MK224PH IEPE1248 e Powered *MATT-XX Mic Attenuator 10, 20, 30 dB Handle higher SPLs ACO Pacific, Inc. Tel: 650-595-8588 Fax: 650-591-2891 www.acopacific.com sales@acopacific.com 14 rapidly, but it was hit hard by the Great Depression. Wartime restrictions forced Celestion and the neighboring British Rola to produce loudspeakers to the same specifications. British Rola bought Celestion in 1947 and moved production to Thames Ditton a year later. The company changed its name to Rola Celestion and sold its products under the "Celestion" brand name. (MPP, later a camera maker, was one of its subsidiaries during the war.) Radio, television, and "hi-fi" speaker production continued in the postwar years. In 1949, Rola Celestion was bought by Truvox, a public address systems manufacturer. In 1968, the company started production in Ipswich, UK. By 1975, it had relocated all its production there. The loudspeaker company then merged with a clothing company in 1970 and changed its name to Celestion Industries, which became Celestion International in 1979. In 1992, the business' loudspeaker portion was sold to Kinergetics Holdings, which also bought KEF. Today, Celestion International and KEF form GP Acoustics UK. In 2006, Celestion ceased to manufacture pro-audio finished systems and focuses on guitar, bass guitar, and pro-audio driver manufacturing. The AN3510, which is one of a three-model line of array drivers, is a 3.5" diameter aluminum cone neodymium motor full-range transducer primarily intended for use in line source arrays (see Photo 1). The AN3510 is built VOICE COIL Photo 1: The AN3510 is one of Celestion's three new linearray drivers. Impedance vs Freq 200 Ohm 100 50 20 10 5 2 1 10 Hz 20 50 100 200 500 1K 2K 5K 10K Figure 1: Celestion AN3510 array woofer 1 V free-air impedance plot 20K