Scanspeak 15W/4434G00 Discovery, 15cm Midwoofer with ringed magnet.
This 6 inch / 150mm bass-midrange unit features the patented woven glassfibre NRSC cone offering a very benign and smooth sound. The ferrite magnet assembly is aluminium ringed (sometimes called Faraday rings) to control rising impedance at higher frequency which in turn offers a wider useable bandwidth. This unit is a solid choice for 2 way DIY designs and also finds many applications as a general 6" replacement drive unit.
Combining some advanced features, this is a great performer at this price point. Available in 4 and 8 ohms.
High efficiency: 90dB @ 2.83V
Coated NRSC Fibre Glass Cone
Die cast Aluminium Chassis vented below spider
Aluminium Ringed Magnet System
Low Damping SBR Rubber Surround
This woofer is 4 Ohms ; the 8 Ohm version is here : 15W/8434G00