Don't overlook this one: https://6moons.com/audioreview_articles/modalakustik/
It's only a preview of a review but I've seen one speaker manufacturer use this style/approach in one of their speakers (built in at the base of the speaker) at an audio show and it made some deep and credible base.
Here is their website as well:https://www.modalakustik.de/english-1/
All the best,
Nonoise
It's only a preview of a review but I've seen one speaker manufacturer use this style/approach in one of their speakers (built in at the base of the speaker) at an audio show and it made some deep and credible base.
Here is their website as well:https://www.modalakustik.de/english-1/
All the best,
Nonoise