2.5 ways or passive subwoofer

[presscot]

I’m going to add bass extension to my 2-way speakers. The speakers consist of 1” SEAS H400 tweeters and 6.5” SEAS H602 woofers. I still have a pair of the H602 woofers unused. I think of 2 methods for the upgrade.

A) passive subwoofer
Build crossovers and enclosures for the remaining H602 and use them with the existing 2-way speakers but leave the 2-way speakers untouched—no high pass for the 2-way.

B) convert the 2-way to 2.5-way system
Add the unused H602 to the 2-way and redesign crossovers to the way 2.5-way did as shown in the picture.



Which choice is more suitable?

 

[Stanislav]

Well, both your choices are practically the same.
In both cases you low pass only one woof.
In both cases your impedance will be half what it was before.
As you'll be using two identical woofs go for proper 2.5 way and cut at the baffle step.