HOW TO MAKE 2.1 ALL IN ONE SPEAKER BOX for PC And DJ CONTROLLER

Get better 2.1 speakers, put them in a box. You don't really list a lot of details about what you have (current 2.1 Logitech speakers is not really saying anything) or exactly what you want and for what use. Are you going to play the sound in a small room, large room, outside, other noise in the room, quiet room, for parties, etc..?

http/www.logitech.com/en-us/product/speaker-system-z623
http/www.amazon.com/Logitech-Z-2300-THX-Certified-Speaker-Subwoofer/dp/B0002SQ2P2

Check out
www.parts-express.com for speakers, amplifiers, and other parts. Their speaker builder forum might be able to give you some input.

"Small woofer" is an oxymoron.

While it is possible to build a speaker that won't be torn the first time you try using it as a woofer, if it works at all, it will only work at low volume for a short time, and I doubt you will be satisfied with its top performance.

It is possible to create a woofer effect with an array of high frequency speakers, and that would provide the effect you want, but I don't know how to do that. (at least now without researching how to design the circuit).

In that situation, you want to have very loud, ultra high frequency (above human hearing range) output from the speakers that will be highly focused in a narrow ultrasound beam. The method would "manufacture" sound at the nodes where two ultrasonic beams intersect, and interfere with each other.

I imagine it would be possible to design baffles in such a way that these nodes are multiplied and distributed throughout the room (I'm sure that's how commercially available sound sticks produce deep bass). It might be more practical to build an object that will vibrate in sympathy with the interference patterns to project real low frequency sound. As I consider how that might be done, I find myself imagining a big round disk with circular grooves cut to 1/4 wavelength...

NEVER MIND what I said. I didn't read your question correctly. Your scale IS realistic, and the moderator has selected an excellent answer for you. Enjoy your project.