McIntosh MS120

10
Specifications
MS100 Subwoofer MS120 Subwoofer
Basic Parameters
Maximum Music Power 300 Watts 350 Watts
Continuous Power 175 Watts 200 Watts
Frequency Response 20 Hz - 250 Hz 20 Hz - 250 Hz
Reference Sensitivity (SPLo) 90 dB 91 dB
Nominal Impedance (Znom) 4 Ohms 4 Ohms
Free Air Resonance (Fo) 23 Hz 22 Hz
Total Q (Qts) 0.2 0.3
Equivalent Acoustic Volume (Vas) 0.1 m
3
0.1 m
3
Voice Coil Overhang (Xmax) 6.4 mm 6.4 mm
Additional Parameters
Voice Coil Resistance (Revc) 3.2 Ohms 3.2 Ohms
Piston Area (Sd) 0.033 m
2
0.047 m
2
Flux Density x Wire Length in Gap (BL) 13 T·m 13 T·m
Impedance Maximum (Zmax) 77 Ohms 58 Ohms
Reference Efficiency ( η
o
) 0.64 % 0.76 %
Mechanical Q (Qms) 4.6 5.3
Electrical Q (Qes) 0.2 0.3
Mechanical Compliance (Cms) 696 µm/N 569 µm/N
Moving Mass (Mmd) 65 grams 86 grams
Moving Mass + Air Load (Mms) 68 grams 92 grams
Magnetic Gap Height (Hag) 12.7 mm 12.7 mm
Voice Coil Winding Height (Hvc) 25.4 mm 25.4 mm
Maximum Stroke (Hag + Xmax) 19.1 mm 19.1 mm
Motor Inductance (Levc @ 1 kHz) 0.7 mH 0.7 mH
Motor Inductance (Levc @ 20 kHz) 0.4 mH 0.4 mH
Motor Resistance (Rem @ 1 kHz) 2.6 Ohms 2.6 Ohms
Motor Resistance (Rem @ 20 kHz) 18.5 Ohms 18.5 Ohms
Resistance Constant (Krm) 8.4 mOhms 8.4 mOhms
Resistance Exponent (Erm) 0.65 0.65
Reactance Constant (Kxm) 4 mH 4 mH
Reactance Exponent (Exm) 0.8 0.8
Dimensions
Overall Diameter 10 7/8 inches (276mm) 12 15/16 inches (328mm)
Overall Depth 5 3/8 inches (136 mm) 6 1/8 inches (155mm)
Mounting Depth 5 inches (127mm) 5 11/16 inches (144mm)
Mounting Hole Diameter 9 3/8 inches (238mm) 11 ½ inches (292mm)
Occupied Volume 0.06 cubic feet (1.7 liters) 0.08 cubic feet (2.3 liters)
Weight
Net 12 lbs. (5.4kg) 13 lbs. (5.9kg)
In Shipping Carton 13.3 lbs. (6 kg) 14.5 lbs. (6.6kg)