Hi people ! I would have a question : Am already rather low – bass fan etc. and therefore would never have taken part in a closed case or a 20s sub. However, I have seen the offer here and would like to hear your opinion about it ( oh a purchase price ) or how much you would spend on it. The sub is new. At least the lower limit frequency with 22 Hz seems to be good ( barely a 15s under 18 heart ) or does this not say too much ? Besides would m I am interested in what the 2 connection terminals has when a power amplifier is already installed and therefore hardly an extra power amplifier can be used. Nominal load capacity: 200 watts Max. load capacity: 450 watts Impedance : 2×4 Ohm Lower cut-off frequency: 22 Hz Upper cut-off frequency: 200 Hz Sensitivity: 89 dB Dimensions: 320 x 300 x 290 mm Special features: Housing: Compact 12 liter closed 19mm MDF housing with 20cm high-performance subwoofer, high-quality double connection terminal, stable S The desire for real low bass is the desire for Mac Compact. In a compact housing is a high-performance chassis, a long-hub passive membrane and a Class D power amplifier with lifting control control. Bass boost, adjustable low pass filter and adjustable phase are further features. Mounting accessories are included. First of all thank you for your opinion. mfg. Kep