Hi Leigh, this post is about opamp upgrades to the asus xonar, these go BETWEEN the dac inside the xonar and its internal headphone AMP, so this isn't an upgrade for the amp itself, these are attempts simply to refine the DAC sound going to the internal amp or to an external amp, so its unlikely to change its ability to drive something like the lcd-3's, other than possible making it output nothing but noises and crackles before it dies (a common occurence with the burson). The internal amp should be adequately capable of driving the lcd-3's but I dont own them and am not looking at the specs, but it sounds like you have them, so I'll say if the volume level is the problem you need to find a different option for a headphone amp, this thread doesn't have headphone amp discussions, although seemingly plenty of australian users like yourself and burson sales people...
Thanks for the info, I ended up getting a wa7, I still want to try the wa7 with the stx. Im not going to use the stx headphone amp. So will I only need 2 burson v6 opamp's? Dont want to spend money I dont have too. If anyone could answer this question that would be great.