This is the "P" version, which makes it easier to use as an actual preamp if you so desire. With the built-in DAC, you really could use this little guy as the head and heart of a sweet system. I really like this amp but I just don't use it enough to justify keeping it. It's nearly new because I bought it from the original owner who had NEVER used it (he got it as a gift and was not into the hobby.) This was about 2 months ago. Comes with original box, etc. I estimate that it has 50 hours on it or less. If you're in the Bay Area, local sale is always welcome.