How can multiple woofers generate lower frequency?

Take the Soliloquy speakers as an example,

Model Woofer Number Low Frequency
6.2 one 6.5” woofer 28Hz
6.3 two 6.5” woofers 25Hz
6.5 three 6.5” woofers 22Hz

They all use the same woofers, how can it be explained?

Thanks for your inputs.

Otto

Is the cabinet the same size?

The exact cabinet sizes are unknown but the speakers are 42”, 44” and 53” respectively with the same base sizes (9” X 13”).

So again how can it be explained? Also what is the advantage to use this design over the single-large-size-woofer design?

Thanks for your inputs.

Otto

Yu11375-

Something like this-
6.2 one 6.5” woofer 28Hz@-3db 22hz@-9db
6.3 two 6.5” woofers 25Hz@-3db 22hz@-6db
6.5 three 6.5” woofers 22Hz@-3db

crude logic but close I think.

The truth is that these drivers all have output down to, say, 22Hz, but a single driver can't provide enough usable output to rate the speaker + or- 3dB to 22Hz -perhaps only 28 Hz.

Add more drivers, you have more usable output at low frequencies, and the crossover and cabinet design integrate them into the total frequency spectrum smoothly