I second Ricred1's comments. I was using an Audio Research LS-25 with the PWD Mk II, it definitely sounded better that way. Now with the DirectStream it's more of a toss up. For me the big difference was the PWD had a rather high output requiring me to run the volume in the 40-60 range which was compromising the sound. With the DirectStream the overall output level is down slightly plus there is an option for an additional 20 dB of attenuation. This works great with sources that vary in their output. The DirectStream also has a much larger bit depth and you can lower the volume to 50 (maybe less) without any loss of data, on the PWD it was more like a volume setting of 70 where there was data loss.