now ive seen the pic im sure i can tell you exactly what it is,
its a full 3 EQ speaker with low, mid, and high's
the black and red are jus for the base plug a normla stereo into this and you'll get jus the bas coming through,
the blue and black / grey are for the high's the tinny sounds and the vocals or mid's
my speakers are jus like that, to get decent sound i need 4 wires on each speaker