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 
audiomike33
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.
Problem is my small budget of $250.  I want a small footprint also, im guessing 10 inch sub is plenty for my size room.  Looking for suggestion on brands and models in my price range, probally not alot of options, i just dont have anymore budget to go higher.
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.