Issue with my tweeters not "turning on" until higher volume
 

I have Alpine TypeX Reference Series 6.5" components and a PDX 4.100 amp, I have the IMPRINT box and it's setup in 3 way so FRONT goes to the woofer and REAR goes to the tweeter.

When I start the car, the woofer works no prob but I hear clicking in the tweets, I turn the volume up and then they "turn on" and then I can turn the volume back down and it's fine for the rest of the drive.....

Any Ideas?