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