Am stations wouldn't come in very well anymore for Saturday college football games in the combine, so I ordered a new heavy duty Jensen am/fm/cd radio for the combine. The John Deere combine only has two speakers - one to the right rear and one to the left rear. The radio has 4 sets of speaker wires - front left and front right and rear left and rear right. Can I just use the rear speaker wires coming out of the radio and tape off the wires designated for the left and right front speakers???????? Is this the best thing for the radio, or is there some other way it should be wired??? I guess I could add some surface mount speakers up front. Thanks.