The reason why my small speakers are so good in spite of their physical limitations which is their small size is the way i modified them is inspired by the concept of transmission line speakers and the Helmholtz resonators principle...
I redesigned the rear porthole with a bundle of different straws of different size and length (max 3 feet ) inserted behind the speakers in the porthole. my speakers are now 50 hertz instead of 80 hertz and clear bass and no negative trade-off... I also redesigned the wave guide to make it better at near listening by putting a cylinder of optimal length near 6 inches...
now these speakers which were well reviewed when i bought them but which i disliked sound like a 1000 bucks small speakers not like a 100 bucks one... I love them so much i will not need to upgrade if they fail ... I will buy another one and modify them the same way ...
High end : basic acoustics knowledge ...