Internals and Specifications

In this section we will take a look at the some of the components used in the Xonar Essence One.


To prevent unnecessary electrical interference and crosstalk, ASUS engineers have designed the PCB layout such that there is an ordered signal path from the inputs to the outputs. This is typical of high end audio equipment designs.


Primary DSP to handle the 32-bit symmetrical upsampling – Analog Devices ADSP-21261, featuring a 150MHz (6.67 ns) SIMD SHARC Core, capable of 900MFLOPS peak performance.


Twelve socketed opamps are used: A combination of TI NE5532, LM4562, LME 49600 and LME49720NA. These can be changed to modify the tonal signature to the user's liking. The audiophile favourite WIMA FKP2 film capacitors are also scattered around the board.


A dedicated internal power supply (instead of drawing power from USB), which eliminates any unwanted nose or interference from other PC components.


Audio Performance Output Signal-to-Noise Ratio (A-Weighted) (Front-out) :
120 dB
Output THD+N at 1kHz (Front-out) :
0.000316 %(-110 dB)
Frequency Response (-3dB, 24bit/192KHz input) :
10 Hz to 48 KHz
Output/Input Full-Scale Voltage :
Balanced Output : 4 Vrms ( Vp-p)
Unbalanced Output : 2 Vrms ( Vp-p)
Headphone : 7 Vrms ( Vp-p)
Bus Compatibility USB
Chipset Audio Processor :C-Media CM6631 High-Definition Sound Processor
Sample Rate and Resolution Analog Playback Sample Rate and Resolution :
44.1K/48K/88.2K/96K/176.4K/192KHz @ 16bit/24bit
S/PDIF Digital Input :
44.1K/48K/96K/192KHz @ 16bit/24bit
ASIO 2.2 Driver Support :
Hz @ with very low latency
Upsampling capability :
I/O Ports Analog Output Jack : 
2 x 3.5mm RCA jack
1 x 6.3mm RCA jack 
2 x Balanced Output (XLR)
2 x Digital S/PDIF Input : 1 x Coaxial, 1 x Toslink
1 x USB Input