1982-87 :
Driver
15" Dual Concentric (3839W)
Ceramic Magnet, PepperPot Waveguide
1987-92: HW
15" Dual Concentric (3839W)
Ceramic Magnet, PepperPot Waveguide
1989-99: Royal
15" Dual Concentric (3889/W)
AlNico Magnet (Alcomax 3), Pepperpot Waveguide, Girdacoustic Struts Woofer: Paper Cone, Girdacoustic Struts, 2" Voice Coil Treble: 2" Aluminum Alloy
1992-98: TW
15" Dual Concentric (3858)
Ceramic Magnet, Tulip Waveguide Midrange/Bass: Paper Pulp Cone, 2" Voice Coil Treble: 1" Aluminum/Magnesium Alloy Dome
2000-2010:Royal HE
15" Dual Concentric (DC 3806)
AlNiCo magnet (Alcomax 3), Pepperpot waveguide Midrange/Bass: Paper Pulp Cone, 2" Voice Coil Treble: 2" Aluminum Alloy Dome
2010-2014: Royal SE
15" Dual Concentric
AlNiCo magnet, Pepperpot waveguide Midrange/Bass: Paper Pulp Cone, 2" Voice Coil Treble: 2" Aluminum Alloy Dome
2014- ... : Royal GR
15" Dual Concentric
AlNiCo magnet, Pepperpot waveguide Midrange/Bass: Paper Pulp Cone, 2" Voice Coil Treble: 2" Aluminum/Magnesium Alloy Dome