Do subwoofers really help?

So Focals have more bass in your system. But how do you know the unnamed speakers of your original post are capable of more bass than you're currently getting? Have you experimented with room placement?

As far as impedance matching goes, there are plenty of high current, good-sounding amps well under $4K that can handle a sub 4-ohm load. A Parasound Halo A 23 can be had new for less than $1K. Even their modest $549 Model 2125 has an FTC 2-ohm rating, as does their twice as powerful $1349 Model 2250.

Thanks everyone I found a solution.

I'm sorry.
Am I missing something here? Did BobRock read the many answers to his question?
Replacing speakers with less sensitive ones resulted in more bass?
what?
And just what WAS the solution? I'd like to know, especially if it was something silly like just a setup issue. If he fixed it by throwing more money at it, that's a horse of a different color.

I actually took everybody's advice. The problem was the impedance curve on the speakers was too steep for the amp, but I liked the amp better. So, I sold the speakers and Got ones that better match the amp. The peak output on my amp is 4R. The impedance on my new speakers never drops below 4R so there are no issues. I can tell this was better than adding a sub because now I do not have to turn the dial on the amp as high to play them loud. Sorry for not being more specific I am sure I am not the only person to have done this.

I spent no extra $$ to do this I got good $$ for the speakers I had.