Supreme Coppersleeve 6" Midrange, 4Ω. The Morel SCM 634 Midrange drive unit combines many of the Morel proprietary technologies and innovations resulting in an exceptional drive unit: The Uniflow™ Aluminium diecast chassis gives maximum undisturbed airflow and minimal rear reflection; the Coppersleeve / Faraday pole piece negates rising voice coil impedance therefore maintaining linearity; the motor system is superbly engineered featuring a Hybrid™ Neodymium / Ferrite mixed magnet assembly and a large 3" voice coil wound with Hexatech™ Aluminum wire. The SCM 634 features a sandwich cone composed of Carbon Fibre outer layers bonded to a Rohacell® structural foam core - a cutting edge technology more commonly found in the aerospace industry. The extremely rigid and light cone offers a highly dynamic sound with great pace and control. The frequency response is tailored specifically for midrange reproduction and is very flat with superb linearity between 1-5 kHz; the useable response extends to 7 kHz. Power rating is 150w nominal and can withstand short term peaks of 1000 watts. A full datasheet can be downloaded from the bottom of this page. Superb drive unit - highly recommended. Key Features: Carbon Fibre / Rohacell composite sandwich cone Hybrid™ Neodymium / Ferrite mixed magnet Uniflow™ Aluminum diecast chassis 3" Large Hexatech™ Aluminum voice coil Copper sleeved centre pole piece High power handling Basic parameters: Resonant frequency (fs) 49 Hz Nominal impedance (Zn) 4 Ω Mechanical Q factor (Qms) 1.32 DC resistance (Re) 3.3 Ω Electrical Q factor (Qes) 0.59 RMS power handling 150W Total Q factor (Qts) 0.4 Sensitivity (2.83V/1m) 89 dB Equivalent volume (Vas) 14 L Chassis diameter 160 mm Here's the full datasheet: SCM634
