anyway to fool amp into seeing 1 ohm load

Yep - you could get another 2ohm sub and wire them in paralell to let the amp see a 1ohm load, but then each speaker will only be getting 500w.

You could theoretically add a 2ohm resistor in paralell to show the amp a 1ohm load, but then your 12 will still only be getting 500w, and the resistor will be getting 500w(until it burns up - good luck finding a resistor that can dissipate 500w...)

If it were me, I'd just run the single 2ohm 12 - the amp will be more efficient running at the lower load, won't get as hot and will probably last longer.

If you wired a resistor in there like this, the extra 500watts (only 3dB increase in volume, hardly noticeable) would be turned directly into heat in the resistor, robbing you of the extra 3dBs you were trying to gain, while making your amp run hotter and less efficient which makes the power less clean while decreasing the life span of the amp.

So, you'd have the same volume only less clean sounding while decreasing your amps' lifespan.

If you were to wire an identical 2ohm sub in parallel to the amp, you'd gain 3dBs for twice the power and 3dBs for twice the cone area. 6dBs is a decent increase.

Actually, if you wired the resistor in there as mentioned, you would have less output, as the sub would only be getting 500w, instead of 700w - all the while making the amp run hotter/less efficient/potentially less reliable.  I posted this suggestion mostly out of sarcasm, as there would be absolutely NO benifit in using a resistor in this manner that I could foresee.

And you would indeed have twice the cone area for a theroretical 3db increase if you added another sub, but you would cut the power to the first sub by 200w as opposed to if you only had it running the amp at 2ohms for 700w by itself, so I don't know if you'd actually get the 3db increase for doubling the power, since you really wouldn't be making twice the power(1000w/2 as opposed to 700w/1)...

EDIT: I just went back and read this and hope it makes sense; i realize the way I worded my response makes it seem kind of confusing, I just couldn't come up with the right words to get my point across. Just realize that adding the resistor in there is not a good idea, and if it were me I would add another 2ohm sub and wire it in parallel if you really feel you need the extra output.

-Matt

I brought back two things written in your post that bear mention:

• If an amp is realistically rated at 700 watts at 2 ohms but only puts out 1000 watts at 1 ohm, it is an amplifier that should be handled a bit gingerly.  If the amplifier were truly robust enough to work well with a 1 ohm load it should be supplying 1400 watts instead of 1000 (due to the 2 ohm rating and Ohm's Law).  It is not robust enough for such duty and so the makers pushed the damn thing to its death and found that its best effort before expiring was (a no doubt generously rated) 1000 watts.  To wit:  run it at 2 ohms load and be happy.
• The speaker may be wired to a nominal impedance of 2 ohms, but it doesn't run at 1000 watts.  It is most generously endowed by its creators the distinction of being capable of withstanding 1000 watts.  You will not get those results.  If you do feed it anywhere close to 700 watts you will be lucky if it survives to see tomorrow.  Make sure it is fitted into a custom box so that its lifespan may be prolonged another day.

just to clear a little something up, ive had one of these amps before running two pioneer 121spl's with absolutely no problems and very very little heat from the amp and a very clean signal.

and also the subwoofer IS rated and runs at 1000w rms as a friend has two of them with 1000wrms going through each of them with no problems.

i came on here in the hope somebody may tell me a way of modding the amp as ive heard this is possible but i guess i came to the wrong forum!

so long and thanks for the help