Although Gilbert Yeung closed Blue Circle last year, he stands behind all of his products and will repair and mod (e.g., adding a USB port) per your request. Equipped with balanced and single ended outputs, the DAC can connect up to three cd transports and a computer at the same time with different cables. In contrast to its smaller mate, the 509, the 507 has a massive power supply designed for higher resolution. Here is one comment from Steve Hoffman's Forum: "sounds full bodied and as musical as vinyl." I will include a very lightly used D-110 DH Labs balanced AES-EBU digital cable. I couldn't detect any sonic differences between using AES-EBU, coax or Toslink. Price is firm. The original price was over $2K.
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