Douk Audio 2 Channel Bluetooth Amp: HiFi Stereo Amplifier | 300W×2 TPA3255 | Class D PFFB | Bass Treble Control | Headphone Out for Home Theater, Bookshelf Speakers (32V PSU)

I bought my A5 pro in July. Used it for a while with the stock op amps and then added opa2134. Bought them from Mouser, wanted real TI product. Sounded good enjoyed it -everything's fine. Then I changed to two SX52b -Listening to a live marillion album hearing details I never heard before, vocals are more clear the entire sound is improved. Definitely better bass. I am using the 48 volt 10 amp power supply and some Elac speakers. What a great amplifier and so affordable. ****Update. 10/18/2025 - Some music started to have a shrill sound in the upper register, the treble was off. Investigated with Gemini my AI and determined the sx52b was not a good fit for a amplifier. Suggestion was to put it in my tube preamp or equalizer as the sx52b adds a definite sound of its own. Gemini had reasons related to electrical specifications and impedance I didn't understand but that was which was suggested. Research the newest TI op amps for music determined that the 1656 would be a great choice but it's not available in a dip 8 socket. I purchased the OPA 1656 mounted into dip 8 socket from Cimarron Technology, Inc (Idaho ). Great company to do business with. Installed the two opa1656 which are known for their clarity, fantastic specifications - but they are neutral and don't add coloration. Tested this all out yesterday and I was shocked. Much better stereo separation than I had before, much better bass. If someone tells you changing op amps doesn't affect the sound I can't explain what's wrong with their ears. :-)

Affordable, compact, and powerful for its size, this amp makes very good, clear sound for my Mac Mini based stereo desktop system. I like the subwoofer connectivity. My only criticism is that it runs hot to the touch and find it too easy to forget to turn it off before leaving my desk.

Amazing little amp for my office

I bought this to have something to listen to while my expensive amp was being serviced and it is amazingly good for $100. Definitely worth keeping one around as a spare or even as a main amp for a small modestly-priced system. The one thing to note is that the binding posts are tiny and will only accept banana plugs with slim shells. My Audience cables fit without a problem, if that gives you a starting point.

I am using this amplifier for my LG television. I am plugged into the headphone output. Volume control is by the tv. The amplifiers volume control is what I would call 3/4 open. I have tried several amplifiers including the famous A07 by aiyima. The Fosi bt20a. Aiyima T4 amp. They all sounded pretty good. A07 I would have ranked second for how it sounded. But I needed Bluetooth without adding equipment. I use Bluetooth as a radio when I am not watching television. Bluetooth works without a hitch, no issues there. Connects to my tablet or phone with ease. Now the amplifier for using for the television is great. Running through JBL Northridge e-20 speakers. They match up pretty well. Sound quality is very good. The main reason I chose the Duck Audio A5 pro is 1,uses the 3255 power chip 2, like is said I needed Bluetooth. 3, it also uses the PFFB technology. Now with such a good sounding amplifier why only four stars. Because it does run ,to me ,very hot. I never had a D type amplifier run so hot. Just makes you wonder how long it will last. Oh well I will find out.

Works great, I love that the Amp works both as a headphone amplifier and a speaker Amp! Pros: Sound is clear and more than able to power the klipsch RP-600M II's that I have. I haven't tried it yet, but being able to switch out the chip seems like a nice feature. Cons: When you plug the headphones in, the speaker outputs are not cut so sound comes out of both. The power strip has a bright green light on it as a status indicator with no apparent way of turning it off.

this little thing packs a whomp. took my computer listening sessions to a whole new level.

This little powerhouse drives my ELAC DB63s extremely well. The BT and RCA switch is very convenient. I pushed it pretty hard right out of the box for about an hour (streaming and vinyl) and it didn't even get warm. I highly recommend this little giant.