I was clearing up my loft and came across a small pair of ALPINE SP400 speakers. On the plate it says, 2 Way Sealed Air Suspension System - handling capacity 50 Watts. They measure 18cm X 11cm X 11cm (7" x 4" x 4") and weigh about 2.5 kilos each. Can anyone give me any information on these speakers as I cannot find anything on the web about them. The sound quality is excellent for such small speakers.