Using a sub with no sub out on my amp


I just bought a Rega IO amplifier it has no sub out I'm using the triangle Berea bro two speakers I'm finding this amp is lacking in bass.  I got about a $250 budget I want to add a subwoofer but I don't have a sub out how do I go about hooking one up to my amplifier any help would be appreciated 
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Strange that the amps sound SO different in the same space and same speakers. Is there an impedance mismatch somehow, phase reversal, .... ?

Speakers on your desk. IF you spend a good deal of time in your office, have you considered changing everything in there? I’m retired a few years already, finally weeded unneeded stuff from when I ran my business from here, and accumulated stuff. That opened up possibilities.

Our rooms are similar, mines essentially 11’ x 11’ room, difference is I pulled my desk back away from the front wall (wharfedales ear level inside bookcase opposite), got myself/monitor/keyboard dead center. Whoopee.

Cutting the bookcases down to 3 shelves high and putting a slightly larger top on them made a huge difference.

You can see my office system (or anyone’s system) like this:

Click on their user name. Click on Details. If a system is shown, click on it.
No i have no choice but to put speakers on desktop on small stands, i just have no room.  My setup is in a bedroom, so very very limited ways to setup, desktop seems to be best.  If i pulled the speakers out off the wall and into the room it would open things up im sure, just dont have the space.
Those dayton audio look good, has very good reviews on parts Express also great video on how to hook it all up and tune it in excellent thank you.