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After the tremendous success of OPUS#1 Audio-Opus has focussed on making an AMP/DAC to experience high definition music directly from your smartphones. Enter the OPUS#11 - an ultra slim high definition and portable High Resolution USB DAC. Converting digital audio into a High-res Smart-Fi analog sound, the OPUS#11 aims to change your entire music listening experience. Simply connect OPUS#11 to your device and enjoy highest quality studio sound wherever you go.
The OPUS#11 is easily compatible with all your smartphone devices. It converts the digital music data of your smartphone devices and converts it into hi-Res analogue sound. Thereby making your whole hi-res music setup much compact. It is the coolest USB DAC and headphone amplifier for mobile Smart-Fi.
Based on ESS Sabre 9018k2m, which is always expected to be very detailed and analytical.
But, the Opus #11 on the other hand is very warm sounding. Nice low end extension. Not that tight but fair depth. Deeper than Mojo.
Mids are very natural, though not as great as Mojo.
Warmth of the amp section feels like it is wrapped over the Sabre output.
One noticeable thing was, though both Fulla 2 and Opus #11 were warm, the Opus #11 was not as smooth as the Fulla 2 or Mojo. It had the typical crispiness of details. I'm glad the amp section didn't mess up with the transient performance of the DAC chip.
I could actually hear the characteristic sound of SABRE DAC 'past' the warmth of the amp section.
Note that it's a simple device, stereo in, stereo out. That's all. No volume control, no line out, no gain mode or bass boost selection. Amplification, that's all it does.
Downside: Output power is less, good for IEM and portable, low impedance and high sensitivity headphones.
the service from headphonezone was super fast as usual and the packaging was really nice. the device was nicely covered with bubble wrap to prevent the damage. SOUND QUALITY: the sound level has significant improvement after using this device. i don't have to raise volume now to achieve same level of loudness. its pretty loud at around 50 % of my system volume. there is significant improvement in the soiundstage which sounds very wide now and there is a great separation between instruments which wasn't very evident before. the bass extension is where this DAC shines its really the deepest i have heard. superb sub bass its like a thunder rolling. but the bass never muddy other frequencies the mids are very forward and vocals are the clearest i have heard the crackle in the sound of the singer is clearly audible as well and background voice depending on the source file. female vocals r pure joy to hear on this DAC. the treble has a nice extension too. this dac/amp has an ESS Sabre9018K2M at its core which is very well complimented by a good amp. its never harsh and there is no issue of sabre glare as the amp keeps this beast in check!this is a very clear sounding and highly detailed implementation of an excellent Sabre DAC. the sound is highly detailed and very powerful. the one good quality or flaw (i don't know need an expert opinion) i found out is this dac/amp is very revealing. if the audio recording ids bad u can make out and i8f thr recording is good u will b treated to a superb sonic experience. its very analytical i say. that's what sabre dacs are famous for. CONCLUSION:JUST LOVING IT!!! great value for money and amazingly detailed and beautiful sound. definitely for the purists! get this if u want portability. nothing comes close to the form factor and the sound. Thanks to wonderful people at the Headphonezone and the Indian audiophile forum at Facebook for guiding me and providing me this astounding sounding device. take my word ----- Just Go For It-----...