NTR06-1705D Chassis Type Cast aluminium Magnet Type Neodymium Diameter 165mm/6.5in Voicecoil 45mm/1.75in
NTR10-2520D Chassis Type Cast aluminium Magnet Type Neodymium Diameter 254mm/10in Voicecoil 64mm/2.5in
NTR10-2520E Chassis Type Cast aluminium Magnet Type Neodymium Diameter 254mm/10in Voicecoil 64mm/2.5in
NTR21-5010JD Chassis Type Cast aluminium Magnet Type Neodymium Diameter 530mm/21in Voicecoil 125mm/5in