Dual 4ohm to 4ohm load?

Ok, it sounds like you do know what a 2 ohm load is when bridged as well as in stereo.  But just for the record, can you tell us how you have the subs connected to the amp.  You said it was bridged, and you said it was a 2 ohm load when bridged.  So you must have the two subs wired in parallel with each sub's positive connected together and each sub's negative connected together as well and then that combination bridged to the amp. 

Also you said it was a 460 watt RMS amp bridged into a 4 ohm load.  But right now you have a 2 ohm load bridged to this amp.  Then you should be getting a lot more than 460 watts RMS.  Close to double this amount. 

Now I'm not saying that this should sound good but why do you want to change this??  You cannot get anymore power from that amp by wiring any other way, and especially not by wiring to higher ohm loads(that would bring it down).  And you said that the amp is stable when bridged into 2 ohms and does not run hot so it should be doing fine.

But you also said that it does not run as high powered as you want it to.  What is it that makes you say this??  Are you hearing distortion and bad sound??

I'm afraid that without changing subs or amps(one or the other) then the only way for you to get a 4 ohm load bridged to this amp is to just use one sub only.  That will get you the 4 ohm load and only the 460 watts RMS, and may even sound better if the other set up is distorting badly. 

Post again to say what it is that makes you think you need to change your set up.

but when ever it talks about any load at 2 ohms its always with two chanels never a mono nor a bridged output: Power Output at 2 Ohms, at 14.4V (1kHz, 0.8% THD): 230 Watts x 2

Twofoot, the owner's manual only talks about a 2 ohm load in stereo with two channels, and not in mono because the amp is not rated to handle a 2 ohm load when bridged.  The amp being wired for a 2 ohm load and bridged is exceeding it's capacity.  You said earlier that it was running cool and was rated to handle this, but what you posted above states that it shouldn't be used this way. 

I would run one sub per channel to protect the amp.  I am not there and cannot possibly know how cool the amp actually is running, nor if it is distorting or not, but I just wouldn't do what you are doing.

I can't find a reference on Alpine SWE 1241 to verify that it is a DVC 4 ohm sub, so this is assuming that your post title is correct.  ( Two 4 ohm DVC's cannot equal a 2 ohm load.)   You have two 4 ohm DVC subs and a 2 channel amp.  You can connect the subs separately to the amp, a sub to each channel, like

.....OR, you can connect the subs together first, and then connect to the amp bridged, like

You'll notice the coils of the subs are wired differently from pic 1 to pic 2.  But the important thing to know is that either way you do it, the amp gets the same impedance load and puts out identical power .  Either way.

So how do you choose which way to do it?

Take the overall install into consideration...the subs share the same enclosure, and sub freqs do not need to be played in stereo.  Both of these points  go to the bridged way of thinking.  Also, there will be less speaker wires to hide, a point also going to the bridged argument.

In fact, there is no reasonable argument to connect the two subs in stereo.  So, quite naturally, I would bridge to the amp wired as shown in pic 2.