As some might know, there are fundamentally two types of crossovers: passive and active ones (Okay, okay, you got me. There are also rare cases of no crossover for speakers with only one drive unit).
And crossovers are pretty darn important in a loudspeaker. They divide frequencies and make sure to send them to the right drive unit: highs for the tweeter, mids for the mid, and lows for the bass. Without them, the frequencies would end up all the wrong places. Say goodbye to that brand-new tweeter of yours.