michael chuaApril 27, 2018PRO DRIVERS12", 55-2982, MCM, Pro Woofer MCM 55-2982 Thiele & Small Parameters Measured Thiele & Small Parameters Sealed Box 75 liters. F3 = 52Hz, Q=1.0 Sealed Box 100 liters. F3=50Hz, Q=0.95 Sealed Box 150 liters. F3=48Hz, Q=0.87 Ported Box 150 liters. F3=33Hz, Q=0.87 Apr 28, 2018 – Preliminary Listening Test in 150 liters Sealed Box Before break in – Bass sounds hard. After break in – Bass sounds softer. More natural. Mid-Bass – Dynamic. Detail. Tight. No Bloom. Low Bass (40Hz) – Audible. No Overhang. Vocals (125Hz upwards) – Sounds Flat. No audible peaks. Bass and Vocals Balance – Good. Bass doesn’t over-power voices. Conclusion Surprising performance. Fantastic value for $37.80 Suitable for PA and even HiFi.