Just as a thought, have you considered trying one or both
speakers (series or parallel) on an open baffle to see what
they sound like? If you are not wanting bass then a piece of
wood maybe a foot or so square might be a starting point?

I once tried it with a drawer from an old dresser which had
a thicker than might be expected floor panel. Worked
surprisingly well.



--
Woody

harrogate three at ntlworld dot com