Jimmy if I had that Behringer monitor speaker lying around I think I would give it a shot as well. For a couple of reasons. Firstly it is a different speaker and therefore a different sound.
The other good thing is you can actually mix Left and Right channels in through the two inputs there. It means you can feed it from a headphone out on your interface etc. As you have two headphone outs I am sure you could spare one for the mono monitor.
All you need is a TRS to two TS leads and run them into inputs 1 and 2. Or a TRS lead to two RCA's and use input control 3 for that CD input.
The fact there is some EQ is also handy. Leave the mids at 12 O'Clock but try setting Lo and Hi to say 9 O'Clock to roll off some high and low end. Try and get away from the full range sound. And yes keep it low as well. The speaker is a little big but the EQ should make it sound as if it were a bit smaller. The fact it is powerful is also not bad especially at lowish volume too.
(it means it will never distort!) I have got one of those old Boss monitors with the two 4" drivers in them and it also makes a good mono mixing speaker too although I dont use it for that but I have tested it and it works quite well in that role too.