In the interest of full disclosure, let me first say that I'm a dealer for Walker Audio. Of course, I chose to take on his line because I believe in him and his work. He is so fanatical that you can virtually expect his stuff to be the best, most evolved, most tweeked out product in whatever arena he enters.
One significant thing I wanted to add to this thread is that the HDLs do not only effect the high frequencies. In my experience, as well as that of many others, they clean up the entire range. The bass gets tighter, the midrange more palpable and, of course, the highs smoother and more delicately revealing. The reason for this appears to be that the ultra sonic hash that is removed seems to interact adversely with the amplifier causing problems in the entire output. The HDLs can even dramatically improve subwoofer performance.
Also, re: the Furutech, Lloyd has just come out with a demagnetizer for LPS, CDs and DVDs called the Talisman which is purported to outperform the Furuech at much less money. Although I haven't personally compared it to the Furutech, I can definitely vouch for it's effectiveness, again cleaning up the entire range.
One significant thing I wanted to add to this thread is that the HDLs do not only effect the high frequencies. In my experience, as well as that of many others, they clean up the entire range. The bass gets tighter, the midrange more palpable and, of course, the highs smoother and more delicately revealing. The reason for this appears to be that the ultra sonic hash that is removed seems to interact adversely with the amplifier causing problems in the entire output. The HDLs can even dramatically improve subwoofer performance.
Also, re: the Furutech, Lloyd has just come out with a demagnetizer for LPS, CDs and DVDs called the Talisman which is purported to outperform the Furuech at much less money. Although I haven't personally compared it to the Furutech, I can definitely vouch for it's effectiveness, again cleaning up the entire range.