How can multiple woofers generate lower frequency?

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

As Marty and John have explained, the extra drivers mean you can play those frequencies at louder volumes. Cabinet size is also a factor, and the taller cabinets have more internal volume.

I'd also be very suspicious of any speaker that claimed usable bass at 28Hz from a single 6.5-inch woofer. Barnyard epithets come to mind.

There are several reasons to use several small drivers rather than one large one. First, it allows you to build narrower cabinets, which the women-folk appreciate. (Two 6.5-inch drivers can probably move about the same amount of air as one 9-incher.)

Also, multiple drivers means drivers at different heights, with different floor-bounce arrival times. Floor bounce can cause suckouts somewhere in the midbass range. Multiple drivers will have different suckouts--so you get more of them, but none as deep as if you had a single driver.