The SR125i's and the SR225i's have the same driver. You can see that through the backs of the housings. The MS-1i does *not* have the same drivers as those 2.
I used the stock pads in each case. Why would I change that? That's how they are shipped. :-)
The graphs at headphone.com need to be taken with a grain of salt. Look at the freq response of the SR60i's vs all the other models:
![graphCompare.php?graphType=0&graphID[]=393&graphID[]=353&graphID[]=363&graphID[]=373](http://cdn.head-fi.org/f/fa/1000x500px-LL-fa9c3eb3_graphCompare.php)
Says that the 60's have the best bass, and that clearly isn't true. I listened from a dedicated player, straight from a PC, and through a Total Bithead. I heard the same thing in each case. The MS-1i sounded more like the SR60i than either of the 80 or 125. Much less bass. The bass with the 80's and 125's is similar and has much more presence, punch, and impact than the 60's or MS-1i. Goes deeper and is more powerful. In spite what that graph says.
The graph also says that the 125 has the worst peak at ~8 - 10 kHz vs the 60's or 80's. But I clearly hear that the 125 is slightly more mellow there than any of the 60, 80, or MS-1i. I compared with different CDs, different songs from the same CD, and at both low and high volume. I did such an extensive comparison because I couldn't believe what I was hearing vs what the consensus seems to be here and other places. But no matter how I compared, I didn't hear much positive with the Alessandros.
Headroom's graphs can sometimes be useful, but you have to use your ears too.
The reason why the sr60 has deeper bass than the other grados on the graph is because they are the only ones measured using the comfy pads. All the others there were measured when they came with the bowl pads.
