I'm planning on running an Eclipse 3241 amp using the front two channels with 6.5 component speakers, and bridging the two rear channels to power a subwoofer.

Can I run a 2-ohm impedance sub with this setup stably, or should i stay with a 4-ohm?

 

i do not see why you can not run it that way (but i mite be off here )

 

400Watts RMS Bridged 4 ohms

Looks pretty clear to me, if its bridged it wants a 4 ohm load. In practice, that puts a 2 ohm load on each channel. If it said each channel could go to 1 ohm, then you could bridge to 2 ohm. But it doesn't say that.

 

Let me get this straght does this mean if your amp is 4 ohm bridgable then each channel is 2 ohm stable?
my amps are 4 ohm bridgable so i am just wondering if each channel can go 2 ohm thanx sorry bout the side question

 

^
Yes, usually 2ohm stable stereo and 4ohm stable in bridge mode

 

go with a 4 ohm sub and have a reliable system, that will sound great. Running at 2 ohms bridged is a risk. It can cause your amp to overheat, cause damage, and go into protection when pushed (turn off and on at high volume levels).