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RE: SSRC

You said you listened to it for two minutes and that was enough. It seems like two minutes is not really a fair evaluation. I have spent weeks comparing No Upsampling, SRC, Wavelab 6.0 Crystal Upsampler and SSRC. I worked hard to optimize each to achieve the best results to give them their best chance. I experimented with the same album on LP, CD, SACD and a WAV file off of the hard drive. Like I mentioned I even compared LPs recorded at high resolution and at 16/44 upsampled.

I did this with many recordings of different types; Classical, Jazz, Rock, Alt, etc...

There is no question SSRC on my systems was far superior to the others or without Upsampling.

Interesting to note the APL upsamples to 211K from the disc, and the sound was superior coming from the PC upsampled to 192K fed to the APL's digital input.


One note you have to use a recent version of ASIO and the highest upsampling rates. These will require the latest PC hardware. In my experimentation a Core 2 Duo won't cut it, only the latest Quad core processors could achieve noiseless upsampling at these high rates. These have only been available for less then a year.

So your 2 minute demo may have been on an older processor at a lower Upsampling rate. Again my experience has been not all DACs can handle these high rates of sampling.

As we've debated in the past Firewire 800 is far superior for audio data then USB 2.0, achieving significantly higher real time (not theoretical) throughput.

The APL DAC also uses a unique Spdif curcuit and clocking. RME uses a proprietary DSP based 1394b solution, not the off the shelf chip based solution.

I might give it a more extensive try with a faster PC.


Edits: 06/14/08
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