I can't love this preamp more, solid feel all the way down to the switches. Love this product

Overall, it's really great, but 3 things I wish were different.I wish the usb was usb-c and provided power. I bought a usb-c to usb-b cable so I can plug in my phone to avoid bluetooth audio quality issues. My phone battery drains while using that setup. I'm not sure yet, but I think after the phone battery gets lower than a certain point, audio over usb stops working to save the battery.Also, the rca analog input isn't really a passthrough and it goes through the pre-amp, which adds more distortion unnecessarily. So there should be a bypass switch or always bypass. I'm not interested in bass or treble or volume control.Also, if it had a phono MM input, I wouldn't need a separate piece of equipment for that.

The Douk P1 is a good amp at the $90ish price point. Audio is clear and defined. The bass and treble controls work well without increasing distortion. Bluetooth connects easily.Used this to drive some HD599s and HD600s and both sound good.There is one small issue - when no music is playing, there is some small static in the left channel. I've used three of these and they all had this issue. I don't hear the static when music is playing.I paired this with an Apple TV and movies and tv sound fantastic.As a inexpensive, bluetooth enabled headphone amp I'd say it is good value for money.

I use this thing almost every day and am satisfied.

Nice little pre-amp, that does what it says. I was primarily looking for device to easily let me stream to my hi-fi via Bluetooth, and this fit the bill. It works great and looks really nice. I had to deduct a star however, because the first one I received failed after the first day of use. At first, it was fine... but then the BT connection would unexpectedly drop and I would need to reconnect. And eventually, it wouldn't even try to connect. No amount of resetting could get it working again - it just seemed like the Bluetooth interface died completely. I submitted a support request to Douk that went un-answered, but thankfully Amazon's exchange process was very easy, and I had a new replacement right away, and so far this one has worked flawlessly in the few weeks I've had it. Unknown what the long-term reliability is yet, but I'm hopeful that the out-of-box failure of the first amp was just a fluke. Overall, I'm happy with the product, and aside from the failure and need to exchange, it has actually exceeded my expectations given the affordable price point.