So I decided to take this afternoon to mod my a700's. Unfortunately Tyson's original pictures have disappeared and darkswordsman17's pictures could use some expansion (no offense, I used mostly your ideas to mod my own). I listen to all kinds of music, unfortunately with this mod Dubstep/Psytrance are at odds with Power Metal since there is something of a trade off of mids to bass. I think I found a happy medium and I'm really digging the new sound, I can finally listen to Blind Guardian now!
Alright, enough babble, PICS!
To get the pad off simply slip your fingers under the inside of the pad and push out and up, very simple:
The front panel has four screws holding it on, a small phillips will do the trick:
This is a rear view of the front plate:
The driver housing is held on by three screws, unscrew them and carefully pull back the housing making sure not to pull too hard on the wires, they don't look too sturdy:
The a700's drivers don't have the hole in the back as mentioned by darkswordsman17, instead there are four small holes. What I ended up doing was plugging two of the holes with blutac and plugging one of the vents mentioned by darkswordsman17:
I unfortunately only have two hands so no pics of the pads going back on. I basically started at the portion nearest the headband and worked my way down. Make sure to align the pad correctly (one part is fatter than the other) to make your life easier. Then simply run your fingers along the underside of the pad and pull the flap out and over the rim. Patience is your friend, and when its all on give it a bit of a twist to set everything.
Finally keep in mind this is the left side, the right side is even simpler since you don't have to deal with the cable, just be sure not to tug on anything too hard and mess up the solder.
After much experimentation the reason I settled on covering two of the holes with blutak, is that any more and the sound starts to get muddy. I found that closing off the vents reduces the very low bass which is important in things like kick drums or the classic rumble of dubstep, but it also brightens things up considerably and improves mids, perfect for Blind Guardian or other metal. Closing off both of the vents, and all the holes in the driver resulted in a very bright but muddy sound. I don't notice the reduced low bass much with the configuration I settled on and am very happy with the results. If I compare one moded side to a stock side I can hear the difference in bass but its subtle. The mids, however, are not so subtle and much much improved. YMMV so play around and report back what you did. I would like to have my cake and eat it too of course so if anyone finds a way to keep the low bass rumble while bringing out the mids some more I would love to hear it.