I have worked in audio for over 30 years ,and just from experience
for example a Hiqiphon tweeter less then .5 % per per on average
$260a pr . The wavecore not even close 2-3% and not even guaranteed X7 drivers a potential for many anamolies. Very simple math. These revelator tweeters,seas millennium, Accuton ceramic
are all in the 1% range .wave Core is a $40tweeter, not $150
you are not going to see hand applied coatings and measurements
per matched pair . Taiwan or not . This is where you get what you pay for better,everything, materials as well as castings on the frame .this is why YG acoustics,Magic, even Wilson have a dedicated line hand built for them ,but at a cost . That is where
the 3-4 % potentially comes in ,and for the Bass 3X that.