2. amps-preamps
  3. 149455-132962

The better amp?

http://www.ti.com/product/OPA2134 OR http://www.ti.com/product/TPA6120A2/description the TPA6120A2 can be used fully diferential(balanced) to a studio monitor or amp, just like the OPA2134, but which has a better sound quality? the TPA6120A2 is in a Roland Mobile UA USB interface(https://www.roland.com/global/products/mobile_ua/) with the DAC AKM AK4414EQ, and the OPA2134 in the Emotiva DAC pre-amp XDA1(https://darko.audio/2011/08/emotiva-xda-1-dac/) with the DAC Analog devices AD1955. thanks...
joser9616
auxinput
2,920 posts
 
USB contains 2 wires for digital signal and 2 wires for "USB Power".  This is just 5V DC and it's driven from the computer/laptop (which is basically the same or worse than a wal-wart switching power supply). 

Also agree completley with timlub.  You can just compare op amp specs and expect it to tell you exactly how good a DAC/preamp is.
auxinput
2,920 posts
 
In comparison, the Emotiva DAC has extremely high current power supply that has a +12V and -12V lines to the op amp / audio circuits.  This is much better than another DAC that uses switching wal-wart or only a 5V USB power supply.
joser9616 OP
29 posts
 
@auxin @timlub, thank you guys for the info. I'm just learning here... 
joser9616 OP
29 posts
 
I made a comparison between the Emotiva XDA-1 and the Roland Mobile UA and I am very serious about it, the Mobile UA is much better than the Emotiva, a lot more detail, more clear ... that interface can be connected to studio monitors In a balanced way, it is exactly the same as connecting it to my two Crown D-75 amps, the active studio monitors(active), as you should know, have their own amp, I have the amps alone with speakers connected.
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