3-way speakers are used to play music...and to try to impress.
Some companies value bling more than bang. So they try to see how many drivers they can cram into one coaxial speaker. This ranges from 3 to even 5 drivers. I don't remember seeing 6, but I'm sure someone has tried it.
You only need 2. A well made 2-way coaxial speaker will blow away any 4 or 5 way costing the same price. That is because the company used their time researching the drivers and creating proper crossovers and such instead of engineering as many drivers into the speaker as possible.
But that is just my opinion.