USB audio 1.0 16-bit 32kHz, 44.1kHz, 48kHz and as they show a setup with the 651A with the DacMagicPlus I'm guessing the DAC in the 651A is not comparable to the DacMagic.
USB audio 1.0 16-bit 32kHz, 44.1kHz, 48kHz and as they show a setup with the 651A with the DacMagicPlus I'm guessing the DAC in the 651A is not comparable to the DacMagic.