Ok I'm going to come clean about my impedance....

Well here is the truth about my towers which I called "The Bad Boys" (changed out the dual 8" woofers for treated aluminum "sub"woofers in my WTMW design, didn't need to tweak the Xover because in my excitement to hear the new drivers I just slapped them in and they sounded great especially in the lower end, they are now known as "The Hench Men", stay tuned for "Shorty", a dual 8" sub to be used with some bookshelf Speakers in an adjacent room and maybe even compliment the main system just for the fun of it). Any ways the system is a 4 Ohm system and the receiver is a Pioneer, so therefore to get an 8 Ohm Impedance, without compromising the design (if it ain't broke, don't try to fix it). I did the unthinkable of running 2 8 Ohm resistors in parallel, then in parallel with the towers. Yeah I know a mad Scientist at work. Recently I became a little concerned without any event about the effects of this on the receiver and wanted to know what other options I have beyond just adding another 4 Ohm mid woofer (it will end up probably being a car audio driver because I can't get home audio drivers at that impedance) and for me possibly spoiling a good thing ?

About the Impedance, gonar you are correct it's series (minor slip up there considering I rigged the thing) so it is 4 Ohms.

rlj5242 the towers are completely DIY, even the Xovers. I live in Trinidad and Tobago and to ship to here, plust taxes would make you wonder if it's worth it (if I am correct I believe that it's 30 % of the cost plus you still have to add the shipping). If it was that easy when I designed those towers about 5 years ago I would have done it as an 8 Ohm Xover and drivers to match. Yeah the resistors would be generating energy into heat hence lost productivity. The resistors are at series at the terminals and not the drivers. Would this still affect the xover points ?

Will correct profile. Sorry about that didn't mean to waste anyone's time here. Should I be concerned about the effects of this on the receiver reason being that I know that impedance changes at lower frequencies but I don't know what kind of effect this would have on my receiver (oh by the way it's a simple deal no pre-outs, upgrade soon to come, looking in the Yamaha or Denon Direction). I really don't want to have to contend with the distortion of a driver just cause it has to level out the impedance. Can I damage something the way I am going or is there an alternative for a variable resistor of sorts ?