Clean and thin sounding interconnect?

Musical Fidelity NuVista sounds like what you are looking for. Very open and neutral, leaning towards thin, especially in the lower registers.

If you want a clean sounding (not thin sounding) IC at a budget price try Element Cable's twisted pair with Cardas RCAs for around $99 new. They are built with Belden cable on what I believe is a J. Risch design. If I can hear obvious differences between power cords using these ICs they must be pretty transparent and neutral.

I should have read the original post more closely. The Au24 ics are not 'thin' sounding.

-IMO

acoustic Zen silver ref mk II. These tilt things up in the frequency range a bit. They are actually a little smooth, but they extend very very well in the highs. They don't have a lot of added mid body in my opinion. And they are ultra transparent.

You might want to look into the Magnan III's. Very nice but somewhat lean sounding cable that is very reasonably priced. As i've posted before though, interconnects are component to component interphase dependent though, so your results may vary slightly. Sean
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