I ordered 2 Polk GNX104's from Crutchfield the other day along with Polk EX-2550's for the front. I also ordered a US Acoustics 85w x 4 amp to run this system from. The problem is that I just realized that I won't be able to bridge two channels of the amp to run the two GNX104's because they are 4 ohm speakers and that would give me a 2 ohm load that the amp can't power. My other alternative is to just hook up the two GNX's as two seperate channels but that would only give me 85 watts per speaker and these speakers are rated 50-175 watts.
Would 85 watts be way underpowered for this setup?
I can't afford another amp at the moment and wondered what is my best bet with this setup? I thought of using the head to power the EX-2550's but that would only give them 21 watts each and they are rated to 60 watts. I appreciate any input you guys could give me.

Thanks

 

Try it out both ways. I would probably power the fronts with the deck and amp the subs. It depends on how loud you like your bass. Keep the gains down, and the subs should have no prob with the amps power. IMHO, the best way is to power the subs with the amp and the fronts with the deck

 

Thanks Isaiah.

The speakers in the front are rated for 60w/channel max so I think the head of the Alpine putting out 21 w/channel would be a bit weak. I am going to try running the fronts with two channels at 85w/channel each and the subs at the same wattage to start with. I may also try bridging two of the amp's channels and wire the subs in series for a total of 8 ohms with the amp putting about 120 w/channel per sub into them. I am not into bass like the Kicker Solo Baric's put out that shakes my house every time they go by. I like bass the way it is supposed to sound and with the Polk's being so efficient they may sound great even with only 85 watts to each.
I appreciate your comments.