For those in the future making Adire 281's, be aware that there is a discrepancy in the manual concerning crossover wiring of the tweeter. The tweeter polarity on the schematic is correct. The tweeter polarity on the crossover layout is incorrect. I do not know why Adire won't fix this on their instructions. These tweeters are known to be harsh from the outset, and this fact makes people believe that the crappy sound they are hearing from the mis-wired tweeter is the normal pre break-in sound. I switched the polarity on my tweets last night and wow, what a relief. The speakers sound great now. It's difficult enough for newbies such as myself to enter the world of speaker building, let alone build them with incorrect instructions. Just an FYI to help those in the future.