I'm trying the ADAU1701 (from Analog Devices) with an external SPDIF receiver (TI's DIX9211). I've noticed that if I change the sampling rate, the amount of bass at my device's output changes. The best results I get with 32KHz/16bit. I get good, full bass with this. But as I go up in sample rates, I lose more and more. At 48KHz I notice it's almost as I'm playing music with a portable stereo (this is a 2.1 system with 10" subwoofer, enough to shake things around).
I tried changing the sampling rate in SigmaStudio but it has no effect.
Measuring the master clock, with a 48Ksamples/sec input signal gives the correct 12.288MHz, LRCK is 48KHz and bitclock is 3.072MHz. This, of course, changes with the configured sample rate.