There are many ways of doing this, all depending on your other components and preferences. If you don't have a receiver/processor where you can pre-set the crossover freq. to the Celestion D100 as "small," then getting a sub with internal high pass filter (most of the active subs do have it, and it is generally set at about 80Hz), would work fine (you would connect the sub to the speaker output on your amp/receiver, and then the speakers to the speaker outputs on the sub). However, if you generally do not play loud, and you are basically looking to augment the low end of the D100, then you would maintain better sound quality by leaving the speakers connected as they are now, and then connect the sub separately, either via additional pre-out, or via the speaker connectors on your amp/receiver. If you do more music than movies, don't play loud, and the transparency of your system is important to you, then I would recommend this way of connection with a sub with smaller drivers (10" or less). Check out the smaller subs from HSU and Pinnacle, these are excellent values.
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