tried my yellow pads with the px100 [listened from the headphone out only]...
although the mids and treble is exactly the same from the piso modded orig pads, with the yellow pad - the sound has more sense of 'soundstage' or space and the bass is more controlled - compared to the bass heavy yet bloated sound from the orig pads.
i could say that grado sr80's improvement from using the yellow pad is far from what can be achieved with the px100 + yellow pad combi BUT if you can get the hd414 replacement pads for ~usd4.00 [pwede na rin sa Php400], it's still a great way to improve px100's sound
and it doesn' feel or sound 'lightweight' anymore
will give it another try next week with my headsave classic
i'll also try to post pics