Hello Ed! As far as I am aware there are no differences in 518 models regarding DSP function, they should all be the same
Check your software version by pressing and holding DSP whilst switching ON the 518 from the power switch on the rear. The display should read "518" and the version number (either "1.14" or "1.22"). You can also read the version when the 518 is in standby, just press the DISPLAY button
Also double-check you have selected TYPE 0 by pressing and holding SOURCE whilst switching ON the 518 from the power switch on the rear. With TYPE 0 selected, wait at least one second then switch OFF at the rear for one-half second then switch back ON again. The 518 will now be in normal mode
You could try the following settings as a start: From standby, press SOURCE - select. Then press DITHER - select FLAT. Then press DSP - select Emphasis
As Glaucon states above, try and get as close to 87 as you can. Also ensure you have selected the IN and OUT to match your transport and DAC. Pressing DISPLAY will scroll thru your selections so you can check the In and OUT settings along with the DSP and DITHER settings
Once you start listening you can then work your way thru the DITHER settings. Take your time here. Happy listening! Regards, Richard