Custom boombox question

[adamsikora]

I have a custom
Box box with 2 4 inch speakers. They sound terrific with them. But lack the bass. I'm wondering if it's possible to make a separate boom box with a small sub to pick up the bass. Like put in a y-splitter cable to connect them at the RCA plug. If not possible. What speakers would do really well to hit as many sound frequencies as possible??

 

[kuifje19]

If you build it yourself then you better replace the whole unit with someting new.
Some speakers just cant go low because of theire characteristics.
If you don't want buy a commercial unit, look for chassis dedicated for sub-woofer systems. They are expensive!
Else you end up with a Big box, or a real boom box with a weak base with no attack ...
If you look for a speaker that has the widest bandwith, ( hit as many... ) then a full-range will do, but they are never subwoofer alike and ar far from a smooth response..

Never any speaker can do it all, its fisically impossible. Although some sounds nice.... if you don't listen carefully