Dual Concentric Loudspeaker Drive Units: From the late 1940's onwards, Tannoy dual concentric loudspeakers earned a reputation for accuracy, clarity, and prodigious output which made them extremely popular in the recording and broadcast industries for monitoring audio. By the late 1950's keen hi-fi enthusiasts were using these drive units at home as well. The trend for domestic applications has continued to the extent that Tannoy now market domestic and professional units separately. The classic designs of the 1940's to 1970-'s now yield high prices amongst vintage audio-buffs. This un-official Tannoy web-site is intended to promote interest in old Tannoy monitors, and assist with identification and restoration. Most photos on this site have come from other web-sites. I would like to thank all those who have (perhaps unknowingly) contributed to this collection. More photos of Tannoy drive units and original cabinet design are required yet, so please feel free to contribute. What is a "Dual Concentric" loudspeaker?

Tannoy Drive Units

"Concentric Dual" Loudspeaker Also referred to as the "Monitor Black" and available in 12" or 15" versions. Monitor Silver Monitor Silver 12-inch and 15-inch Monitor Red The III-LZ, Monitor Red 12-inch, and Monitor Red 15-inch Monitor Gold The Monitor Gold 10-inch, Monitor Gold 12-inch, and Monitor Gold 15-inch Monitor HPD (High Performance Dual) Monitor HPD-295 (10-inch), HPD-315 (12-inch) and HPD-385 (15-inch) HPD-385-A Performance Predicted Frequency Response Measured Frequency Response Monitor Royal (Blue magnet cover) The Monitor Royal was a marketing name for the HPD-series in Canada only K-Series and DC-Series K-3808 and K3838 (magnet assembly shown at right) Predicted frequency response DC-series for consumer applications

Tannoy Loudspeaker Cabinets

Cabinet Designs Tannoy loudspeaker cabinet designs from circa 1965: Design plans for: Tannoy York, Lancaster & III-LZ cabinets Design sketches for: Tannoy York, Lancaster & III-LZ cabinets Alternative cabinets for the Monitor Gold, suggested by Alex Garner of Tannoy Monitor Silver 12": Cabinets and Frequency Response Tannoy Autograph - now with design plans Tannoy Corner-GRF, and Rectangular-GRF Tannoy Rectangular GRF design plans (drawn by, and courtesy P. Stinson) Cabinet Designs for HPD drive units from the 1970's: For 15" drivers: Arden, Berkeley For 12" drivers: Cheviot, Eaton For 10" drivers: Devon.   Thiele and Small Parameters For Monitor Silver, Red, Gold, HPD and K-series Individual T&S measurements for a Monitor Silver 12" driver Living with Low-Q Loudspeakers, such as the Dual Concentric

Other Tannoy Information

Roll Surrounds, Driver Construction, Crossovers, & Curiosities Projects & Modifications Improving the Performance of a Classic Tannoy Driver by Peter Campbell, Australia. Monitor Gold crossover upgrade with Solen FastCaps Modifying the Tannoy York Cabinet Roll Surrounds Sources for Genuine Tannoy roll-surrounds LF Driver Surround Replacement Procedure for the HPD-385A HPD-385 driver - photos taken during surround replacement Drive Unit Construction Gold HF unit - a detailed description of construction HPD-385 voice coil - detailed description of voice coil and magnet parameters Tannoy Magnets Tannoy Compression HF unit - a description of re-assembly and alignment details for the "Monitor" series. Archives Tannoy History - the official story from Tannoy! Original Tannoy 50's & 60' sales brochures: courtesy www.hifilit.com More Tannoy Sales Brochures:        GRF, Autograph, "Luxurious Listening", & 1974 HPD. An archive listing of Tannoy models, from 1956 to 1999 An archive listing of Serial Numbers Part Numbers and Production Dates for Dual Concentrics Crossovers Tannoy Crossover Circuits for Silver, Red, Gold, HPD and more Some frequency response measurements on the Gold Crossover Curiosities Tannoy Curiosities Lighthouse Foghorn system Acoustic Lens Patent Application Radiogram System, circa 1930 12-inch Direct Radiator Drive Unit Tannoy "World Wide Web" Resources Official Tannoy home page link: http://www.tannoy.com/ Hans Hilberink's (Netherlands) excellent Tannoy web site: http://www.hilberink.nl/speaker.htm The Tannoy GRF: a web site by Kelvin Fleming, Australia Tannoy Speakers by Danny Loke - a Gold Enthusiast. Vintage hi-fi pamphlets & literature: http://www.hifilit.com/

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