I got my powered S/PDIF splitter today, so I thought I would run some preliminary tests, informally .
Some disclosure first :
a) I am no expert in this, so if I am doing it wrong (or you suspect I might be), please let me know .
b) All audio from sound card line-outs is digitized by my Akai DPS12 at 44.1KHz .
c) Sound levels between input on the DPS12 are matched approximately. So take comparisons between cards of different families with a grain of salt . Comparisons between cards of the same family (AWE64 card variants) while be run on one set of DPS12 input, always with same gain settings, and should be comparable between cards.
d) Digital recording card used is a cheap CMI based USB card with S/PDIF inputs connected to my DPS12's S/PDIF output .
First, a baseline of sorts . Akai DPS12 with all inputs muted .
The attachment dps12_all_inputs_muted.png is no longer available
CT4500 line-out with wave and MIDI (EMU8000) unmuted and at max level on sound card mixer .
The attachment dps12_ct4500_wave_midi_inputs_only.png is no longer available
Audiotrix 3D/XG line-out with wave and line-in (Dreamblaster X2) unmuted and at max level on sound card mixer .
The attachment dps12_audiotrix3dxg_wave_line_inputs_only_linear.png is no longer available
The attachment dps12_audiotrix3dxg_wave_line_inputs_only.png is no longer available
EDIT: Added linear view of Audiotrix 3D/XG frequency plot .