I don't think it can be done, dade. The tweeters were only available with the upgraded head unit, which includes a CD player rather then a cassette deck. The way I have seen after market tweeters hooked up are that both the tweeter and midbass are connected to an amp and they relayed back to the headunit. The upgraded stock Hyundai head unit has a built in 100 watt amplifier. Whether its external or internal is beyond me. That is what powers all 6 speakers. Check with Hyundai just to be sure. Depending on the year of the car, it maybe able to be done with ease if the unit can handle it and were designed for it, like the upgraded system is. If I not, I recommend buying a new head unit so you do not overload this one.