Did I really need a sub woffer in the first place?

I recently added a subwoffer which I thought would enhance the sound of my 2 channel music system. I have a Rotel amp (380 watts) with the matching Rotel preamp and Rotel CD player and Energy Veritas 2.4 speakers. I bought a REL Britannia B1 subwoffer to enhance the bass.

Well now that I have it set up I'm not that happy with what it adds vs what I spent ($1,850). I'm wishing I would have put that money toward a turntable instead.

Wondering if maybe I've just got it set up incorrectly - there are so many adjustments like Mode Switch used to set the phase and to bypass crossover for Low Level input. Also has these switches:

Lo Level
Hi Level
Fine Roll Off
Coarse Roll Off

For an additional $100 the stereo shop will send a guy over to 'tune' the system. Wondering if I'm just throwing good money after bad and maybe I'll cut my losses and sell it here on the Audiogon classified section.

Any thoughts or suggestions?

Thanks

By the way - I love my Subwoffer I have in my home theatre. Could'nt watch an action movie without it.