Rhodyavphile -- Do you use your Singlepower amp only for headphone listening or is it used as a replacement to your Spectral preamp? Could you comment on the Singlepower as a headphone amp (e.g. dependability, break-in time needed, what other competiting brands did it best) and as a company (e.g. post-sales support) please as I am thinking of adding one of their products for my headphone listening with Sennheiser HD-600 cans.
Thanks,
Kevin