Normally tyhere is an output lowpass filter which removes those switching components and only leave the audio signal. It's a Douk audio rebrand from Weiliang Audio E600 which from my experience cannot do proper SE>BAL or BAL>SE, as well as having an out of phase XLR-4 output. In other words you are likely to damage the speaker voice coil by driving a speaker with such a signal.

Read more My first unit had a problem with the AUX section and the seller sent a new one immediately. Rubbish Chinese amps like this one are getting rarer - the majority of them now have excellent build quality and aspire to be a hi-end product. Another major problem with filterless Class-D designs such as this Nobsound Bluetooth amplifier is EMI which stands for electromagnetic interference.

If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag. Vintage amplifiers usually have more “fun” in the sound, mainly due to far from flat frequency response and THD levels. As such I would bet this amp does not meet the FCC Part rules section 15B which is a requirement by law and as such most likely is even illegal to distribute in the US. There was reported that Russian tubes sound much better, and the tubes with golden grids make the best sound.

There is only one power transformer under the box, which delivers 17V to output transistors, 7V to microchips and 6. The audio is detailed and transparent and quite revealing that my Mordaunt Short MS15 speakers, although lacking a bit of bas.

This results in a strange stereo image where bass is affected and voices and instruments cannot be placed properly, a fuzzier stereo image. It warns that not having this output filter could damage the speaker voice coil and also the EMI could have negative impacts on nearby devices.

I can safely say, 100% goods sold are fake (not cheap) and they do it openly, and authority don't care. On topic, I've also heard some excellent sounding Chinese gear like Ming-Da and Line Magnetic (have an LM dac myself) and have built gear using affordable (not cheap) Chinese line transformers, plate chokes etc.Given the fact that the connectors aren't hand wired and are soldered onto the PCB correctly this leaves a few conclusions. When I brought this to their attention, they sent me a new faceplate with "Nobsound" on it but no "E-600. The inlaws makes a request to families in HK and then it gets taken across the boarder, just don’t get caught with quantities otherwise customs will either confiscate or make you pay import duty. Probably because the one amp is the basis for many many amplifier types that all look different when under the bonnet it's just the same SS amp.