SoonHappy.... I am not surprised you were not happy after taking all the time to build both kits only to find they had bad tweeters. However, your solution, to send them all back to Amazon after having been built seems very strange....and your suggestion that this is a marketing trick by HiVi is ludicrous.
Did you contact HiVi directly, either through Amazon or through their U.S. web pages? I have heard that getting replacement drivers sometimes takes a couple of weeks, but I have not heard of them refusing to replace them for free. You can buy the tweeters on
Parts-Express for $19 each.. ..and understand that HiVi has refunded the Parts Express price to buyers to make the swap happen quicker.
How did you find safe boxes and packaging to put the entire built speakers in to ship...my guess is the shipping costs would be almost as much as the speakers cost. I am not surprised that they arrived damaged unless they were very carefully packed which is hard to do unless you have custom packaging.
Your theory that HiVi is sending out bad drivers, or not QCing them in order to save a few bucks is ridiculous. Building, packaging, and shipping the heavy cabinets costs them a lot more than a couple of tweeters. How much do you think it costs them in shipping every time there is a return.
If you had taken the time to post here or on the AVS Forum thread, I am sure you would have gotten advice on how to solve your issue with less stress.