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 
128x128audiomike33
Prior response, add single sub, I assumed a space without a lot of space like my small office.

IF you have the space for placement, and listening position to enjoy imaging, bass and the overtones of the bass notes give directionality and stereo imaging.

You might want to try a stereo pair of subs. These are ideal for that, front firing, no port. Place l/r adjacent to your mains.

Easy to try, Rockville will let you return the second one if you find it’s not worthwhile in your space.

If you go for a pair, perhaps their 10", or even their 8" will do, scroll down on the same page as above

https://www.rockvilleaudio.com/rock-shaker-12-wood/

you know your space and budget. You can give them some info and ask their advice.
I just checked, the 12" has no Port (my preference and advice). The 10" and 8" models have a rear port. If not near corners ok, but avoid them if possible to achieve the kind of imaging the pair is intended to achieve. Single sub, a port can get 'more' but I find it's risky, you can get 'more' mud.
Thanks for everybody's replies I appreciate it.  First let me say that when I hook up my Cambridge audio axr 85 amp to my speakers there is plenty of bass I'm not a base head so I'm not looking to get crazy amounts of Base but when I hook up my Cambridge to those speakers there is enough I'm satisfied with the bass I just don't like the rest of the sound signature.

I'm not sure if my speakers because why am I getting good bass out of a different amp but when I hook it up to my IO amp I'm not getting as good a base I think it's the amp and I know I'm not going to get really great bass out of a 5 inch woofer.

Those wharfedale diamond 225s I've always wanted those and I heard that those pair very well with my rega IO.  It does have a bigger woofer in The wharf tales and it's not that much bigger of a speaker than mine dimension Wise it's not a whole lot bigger it's a half inch wider 2 in taller I've read a lot of stuff around the internet and on these forums about the wharf deals with my amp 

But I do like to sound signature with my speakers there's just not enough face so I'll probably just add a subwoofer I don't want to sell my speakers get the wharf tales I don't like them.  I'm definitely going to check into your guys recommendations for subwoofers wasn't planning on having to buy one so I really don't have much of a budget for one.

My room is 10 ft x 12 ft so it's not very big and my speakers sit on my desk they're about 5 ft apart I got them on stands so it's not an absolute ideal situation where I can pull them out into the room and put them on floor sanders and probably get how much improve sound with my current room I just don't I can't pull it off they have to go on the desktop.  I will say though they do sound good on the desktop the image well they sound good I got them towed slightly in I'm just missing the low end punch.
I wouldn’t put too much stock in wharf tales if I were you. Fishermen always brag about the one that got away.
Well its kinda a know fact the Wharfdales 225 pair well with Rega IO, at least everywhere i read.

Im going the sub route.