I have a Quickie on the way to try with my current Asgard/Bifrost and Emotive Mini-x setups but am looking down the road a bit and getting a SEX or Mainline to work with the He-500 (or maybe HE6 in the future). Is one any better sounding with the HE-500? I find that while the Asgard/Bifrost works it is thin sounding to me- disappointing. I would like to warm up the sound a bit.