Question About Mix Matching Two Subs

[jak]

Right now I have a 12" JBL sub which sounds pretty good to my ears.I have Klipsch rf-62 ll speakers and a rc-62 ll along with it.I just took a advantage of the sale at Newegg on the Klpisch rw-12d sub.Couldnt pass it up for $299 delivered.I know that eveyone here would say that two subs are better than one.I read the guide to bass management and it stated you dont have to have two identical subs.I guess im wondering if it's a big headache trying to get two different subs to sound good together.Is it worth buying an extra cable to try out,or is it just a big headache?Do I just try and match the settings on the back of the subs to each other,then just run the calibration on my Marantz reciever?Any advice or tips would be a great help.