Magnepan MG1b Specifications 
 
Two way radiating dipole
45Hz to 20Khz 
Bass radiating area 428 SQ inches 
Tweeter radiating area 68 SQ Inches 
SPL = 86dB/Watt 1 Meter
Max recommended amplifier by Magnepan = 200Watts 
Typical operating power requirement = 60Watts
Nominal impedance = 5 Ohms
Dimesnsions  152.2cms x 55.8cms x 5.1cms
Weight 16.4 Kg's each