dual subs and serialing

This may have been answered before, but searching for these terms only brings up wiring methods.  Anyways, lets say we have 2 4 ohm, SVC subs and a 2 channel amp and it double power as resistance is halved.  lets say power@ 4ohms is 250 wattsx2 and 500X1@ 2ohm

So if I connect these 2 subs @ 4ohm,  without bridging the amp, each sub would see 250 watts.

And if I wire the subs in serial making a 2 ohm load and bridge the amp to 500wX1 channel, wouldn't both subs still see 250 watts, since it 500 watts total divided by the 2 subs?  Or am I over thinking things?

Very few 2 channel amps are stable at 2 Ohm mono. The only safe way for you to connect those speakers to that amp is 1 speaker per channel for a 4 ohm stereo load. Or wire the speakers in series for an 8 ohm mono load. You need to do some research on series and parallel circuits. You are calling parallel wiring series.

You are correct.  I guess I should have proofread my post before I posted it.  I do have parallel and series resistance backwards.  Anyways the amp I have is a 5 channel amp (Boston Acoustics 5750) that has 2 channels for the subwoofer, although they are intended to be bridged.  Anyways, the manual does list ratings @ 2ohm and 4ohm, so I would assume it's 2ohm stable.

The Boston Acoustics GT-5750 is, as you say, a 5-channel amplifier. It only has a one channel (mono) subwoofer amp, and it is stable into 2-ohms.Support the12volt.com

It may have 2 sets of terminals for the sub. But the sub channel is only one channel. It may have 2 sets of terminals for ease of connectivity. Both of the + terminals are electrically connected inside the amp. Same for the - terminals. There is no bridging of the 5th channel.