Balanced into the Teac, but RCA to the amp. I think Jack had suggested trying RCA into the Teac. Worth a try but I already have some nice WW XLR cables and I had already ordered the Rothwell prior to deciding on the W4S. The other consideration is that prior to going the route of the XLR I did a lot of research and it came away recommending using the balanced cables where possible

... Man there are a lot of considerations... but I guess this is what makes it so much fun...
BTW... I have distinctly noticed that the pre-amp is starting to smooth out a bit. maybe 30+ hours on it, so a long way to go still

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