Tannoy Subwoofer 625ALF - speaker in enclosure only (Surrenden BN1)

Tannoy Subwoofer 625ALF - speaker in enclosure only. There used to be an amplifier section of this (you can see where it used to go in the photos) but now it is only the speaker. The speaker sounds pretty good though - I believe it is 100W rated. In black enclosure. Impedance is 8 ohms. Speaker is connected via a jack socket on a flying lead - see photo