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Hi Steve, TS Parameters of Colossus 18XB as follows: Resonant Frequency (fs) 32 Hz :frowning: Impedance (Re) 6.0 ohms Electromagnetic Q (Qes) .34 Mechanical Q (Qms) 6.58 Total Q (Qts) .323 Voice Coil Overhang (Xmax) 7.2mm Surface Area of Cone (Sd) 1.12m2 BL Product (BL) 25T-M...

Many thanks for your reply, Blake. Much of what you say I have taken on board:frowning: , but I bought the XB version of the Colossus because it has an xmax of over 7mm, which seems impressive for an 18 incher. Fane themselves suggest that the speaker can be persuaded down to at least 25hz with...

:crazy: I'm in process of trying to construct a subwoofer using two Fane Colossus 18XBs which will be good enough to provide quality low bass for my excellent hifi setup, but also have the muscle to provide decent performance with my home theatre kit. I've got access to good facilities and...