@freemand
The Classe Sigma SSP is optimized for stereo or when used as a stereo preamp and its DAC is very good especially when fed via its USB input. Its USB input by far sounded way better than its other inputs for digital music files. I will guarantee that the CD disc played back through your Oppo 103 connected to the Sigma SSP via spdif (coax digital) or HDMI sonically cannot compare to those same CD properly ripped in digital files (FLAC) and played back through your computer feeding the Classe Sigma SSP via USB. The latter by far will be superior sounding.
Do not hesitate to purchase the Classe Sigma SSP. It also performs and sounds really good when used as an analog stereo preamp in bypass mode. If you have a high end CD player or DAC and want to feed the Classe via analog and use the Classe Sigma SSP as analog stereo preamp you will have to select digital bypass mode thus bypassing DSP and other digital processings in the Sigma SSP so the analog signal will be kept in pure analog domain all the way through its analog output stage or otherwise DSP will get in the way and will degrade sound quality.
The Classe Sigma SSP is your best solution for combining your stereo and multi-channel needs in one single box at a very attractive price on a used unit.
Its surround performance for home theater is also very good. You probably won’t need the NAD M51 and just use the DAC in the Classe. The NAD M51 was great and is still good by today standard but the M51 is a bit older measured by DAC or digital audio technology and the Sigma SSP is newer and uses newer and up-to-date DSP and DAC or digital audio technology.
You can try connecting your NAD M51 DAC to the Classe Sigma SSP but first you will have to set the output of your NAD M51 to fixed and set the Classe Sigma SSP in digital bypass mode and make comparison between using the NAD M51 to the Classe via analog with the Classe set in bypass mode vs streaming digital files directly to the Classe via USB input on the Classe.
That way you will know and find out which will sound better to your ears.
The Classe Sigma SSP is optimized for stereo or when used as a stereo preamp and its DAC is very good especially when fed via its USB input. Its USB input by far sounded way better than its other inputs for digital music files. I will guarantee that the CD disc played back through your Oppo 103 connected to the Sigma SSP via spdif (coax digital) or HDMI sonically cannot compare to those same CD properly ripped in digital files (FLAC) and played back through your computer feeding the Classe Sigma SSP via USB. The latter by far will be superior sounding.
Do not hesitate to purchase the Classe Sigma SSP. It also performs and sounds really good when used as an analog stereo preamp in bypass mode. If you have a high end CD player or DAC and want to feed the Classe via analog and use the Classe Sigma SSP as analog stereo preamp you will have to select digital bypass mode thus bypassing DSP and other digital processings in the Sigma SSP so the analog signal will be kept in pure analog domain all the way through its analog output stage or otherwise DSP will get in the way and will degrade sound quality.
The Classe Sigma SSP is your best solution for combining your stereo and multi-channel needs in one single box at a very attractive price on a used unit.
Its surround performance for home theater is also very good. You probably won’t need the NAD M51 and just use the DAC in the Classe. The NAD M51 was great and is still good by today standard but the M51 is a bit older measured by DAC or digital audio technology and the Sigma SSP is newer and uses newer and up-to-date DSP and DAC or digital audio technology.
You can try connecting your NAD M51 DAC to the Classe Sigma SSP but first you will have to set the output of your NAD M51 to fixed and set the Classe Sigma SSP in digital bypass mode and make comparison between using the NAD M51 to the Classe via analog with the Classe set in bypass mode vs streaming digital files directly to the Classe via USB input on the Classe.
That way you will know and find out which will sound better to your ears.