Have you considered trying the Aubisque usb filter that Larry Moore recommends to use with the DAC-41? I have the the same dac and since moving from LCD2 to 3 I have noticed a little more glassy edge to the sound. I think it is a fantastic dac for the money you can pick them up for. I hope to try the Aubisque with it soon. There again it might not be the fault of the dac and the fact I have a lot of silver cabling in the chain. No doubt I will obsess over this for weeks lol.