Help with Bass tube install

[memo43]

Ok so either I bought a bad unit or dont know how to wire it.
I have a 8" bass tube to suplement my truck radio.
Its an SCB80 bass cannon
it has two red wires 1 solid red (power)
one red with black stripe (ground)
plus the two speaker wires.

Im assumeing the solid red I should be able to connect it to any key one source and good ground.
when I do this I get no sound comeing from it, I can hear the speaker where it connects (thump sound) and thats it.
should I wire it directly to the battery or find a good power source. I am trying to connect it to the same power source as the head unit.
nothing fancy kenwood head unit with two 6.5 kenwood speakers.

thanks for any and all the help

Memo