MTX mxa4004 4 channel amp

ok i have an MTX mxa4004 4 channel amp the specs are:

50Wx4 at 4 ohms

100wx4 at 2 ohms

So does this mean  if i make the speakers two ohms by wiring them together, i can hook up 8 speakers to this amp to get the full power out of it wich is 400 watts? I'm just not sure how to wire them to make them 2 ohms and if it can be done. because im looking to hook up 2 extra speakers to make 6.  So instead of each channel puttin 50 watts to one speaker, each channel would be putting out 100 watts devided between 2 speakers. is this correct?

Paralleling two pairs of speakers changes the ohm load from 4 to 2, so the amp will make more current.  What you are talking about is questionable....you want to double the number of speakers to make the amp give up all its power, but at a cost.  High and mid frequencies will very easily demonstrate the poor audio characteristics of running an amp at a 2 ohm load.  Where this is used often is with subwoofers, where the low sub freqs generally aren't affected by the amp producing more current.  But your speakers....not a good idea.  If you want that many speakers, use two amps.  But that would be stupid, too.

But you do have the gist of it, parallel wiring, halving the ohm load, and the amp responding with higher current.  Just think about what your objective is here before you go out and buy 4 more speakers just to push the amp harder.

Well, all vehicles and applications are different, so I don't know what your incentive is to install that many rear speakers.  If it is a 15 passenger van, and you want to supply speakers for the boy scout troop on a trip...then I can see why you would want to do this....

But I'm betting you want to put in the four speakers in the rear because you happen to have them and found that there is room for them.  In an ideal soundstage, the fronts will reproduce the brunt of the music, with the rears filling in to the point where you actually don't hear them from the front seats.  They just pull the sound back a little from the front locations.  This means that the rears are set at a lower power than the fronts, usually by using the fader control.

By enabling two pair of rears at 2 ohm, you would be doubling the sound from the rear compared to the sound from the front.  And the rear sound would be suffering because the amp is providing a poorer quality output to them.

I can see this only if you have the rears set on low pass, and are using them for bass output only...such as in a case where there is no subwoofer in the system.

I 100% agree with everything stevdart said.  Focus your attention on making your main front speakers sound great.  Use at most 1pair of 6x9's in the back, at 4 ohms, to provide the rear fill stevdart was talking about.  Many of us don't even run rear speakers. 

You have a sub, right?