I tried to make the 007 pads work on the TH900 in vain. They so sound more open but the bass is gone. I also tried other pads. I also tried the Lawton mod and discarded it in the end. Thick pads like Audeze don't work, they make the sound hollow, dark and muddy. I don't know the Lawton pads, but they are the thick type, bad omen for me. The best and cheapest solution was to order replacement pads for the TH600 (same as the TH900, order from local dealer), and do the mods I described earlier in the TH900 thread:
- replace the stock pad foam with carbon foam; this makes the biggest change;
- replace the foam dampers with 5 mm 100% wool felt dampers, 73/48 mm; depending on the felt make, this makes the mids wonderful and the bass with more body
- halve the polyfill amount in the cups (for the TH900; I don't recommend that for the TH600).
This made the TH900 sound like a veil lifted off: deeper and more transparent bass, better microdynamics, much better midrange, same heights, big sound stage. A game over headphone.