Hi, I'm Mark, I'm also having an issue.
I have a 16ohms amplifier Denon,
2 speakers Bose 301 iii,
(Each speaker box has one 8ohms woofer, two tweeters)
The tweeters burned so I romoved them and replaced with one dual cone 6ohms tweeter.
So I redesigned the box. Which now has one 8ohms...