I think it's for 2 reasons. Firstly, Hartke makes way better amps than they do cabinets and the aluminum cone speakers offered a really shrill sound and was basically designed for slappers who wanted cabs without tweeters. Now that tweeters are the norm for cabs now, they're trying out other cabs. Their XL cabs are very heavy as well. Also their cabs do not have very high power ratings as 500+watt amps are just about the norm these days. Secondly, Hartke has some new cabs with a hybrid speaker design and better power ratings on the horizon and they may just be making room for those. I've been eyeballing their new amps but I'm hoping they jump in on the micro amp bandwagon.