This is the new 2009 "Fubar4-Plus" DAC + integrated Headphone Amplifier
The Fubar4-Plus is a superb 24Bit/192kHz upsamplig DAC + Integrated Headphone amplifier + RCA outputs (analog) to connect to your audio rig. You get HiFi music direct from your PC to connect to your home stereo, or you can use the built-in headphone ampifier to drive your headphone. Sound source can be USB or S/PDIF, coaxial as well as optical.

Features:

 USB input: Plug & Play via USB. Requires no addition software or drivers
 
 S/PDIF inputs: Digital inputs for both Digital Coax and Optical, with 24 Bit 96kHz DAC.
 
 Headphone Output: 1/4" (6.4mm) headphone jack. This amplifier will perfectly drive bigger audiophile headphones with ease.
 
 Gain Switch: External gain switch to optimize with your headphones. Compatible with 32 - 600 Ohm impedance.
 
 192 kHz Upsampling: Will give you more natural performance.
 
 RCA Outputs: Gold Plated RCA outputs to connect to your home stereo for playback over speakers.
 
 Volume Control: Controls headphone output and and functions as pre amp volume control for the RCA Outputs
 
 Changeable OpAmps: The OPA2604 OpAmp in the headphone amplifier are changable.
 
 Color of faceplate: Available in your choice of Black and Silver face plates.

Specifications:

 Amplifier Structure: Coupling Capacitor Less / Push-Pull
 
 Line Level Output: RCA output 2 Vrms
 
 Gain Control: High setting (normal) / Low setting provides 20dB attenuation
 
 Volume Control: Series / Shunt - user selectable (default is Series)
 
 Headphone Impedance: 32 Ohm to 600 Ohm
 
 Circuit Protection: Output Short / Over Current Protection
 
 USB Support Format: 16 Bit - 32 / 44.1 / 48 kHz (compatible with Windows, Mac and Linux)
 
 S/PDIF Support Format: 24 Bit / 96 kHz
 
 Upsampling: up to 192 kHz
 
 Input select: Auto Select - USB highest priority
 
 USB Chip: CMedia - CM108
 
 Reciever: Texas Instruments - DIR9001
 
 ASRC Chip: Texas Instruments - SRC4192
 
 DAC Chip: Cirrus Logic - CS4344
 
 LPF OpAmp: National Semiconductor LM4562
 
 Main OpAmp: Texas Instruments OPA2604
 
 Servo OpAmp: Texas Instruments TL072

Audio Performance:

 S/PDIF (Digital Coax and Toslink Optical input) - RCA outputs - (1 kHz Sinewave) 2 Vrms
 
 Noise Level: (1 kHz A-weighted) -111.9 dB
 
 Dynamic Range: (1 kHz A-weighted) -111.6 dB
 
 THD%: 0.0018%
 
 Stereo Crosstalk: -111.0 dB
 
 ----
 
 S/PDIF (Digital Coax and Toslink Optical input) - Headphone output (1 kHz Sinewave 2 Vrms)
 
 Noise Level: (1 kHz A-weighted) -99.7 dB
 
 Dynamic Range: (1 kHz A-weighted) -99.6 dB
 
 THD%: 0.0020%
 
 Stereo Crosstalk: -90.0 dB
 
 ----
 
 USB Input - RCA outputs (16 Bit / 48 kHz)
 
 Noise Level: (1 kHz A-weighted) -96.2 dB
 
 Dynamic Range: (1 kHz A-weighted) -96.2 dB
 
 THD%: 0.0017%
 
 Stereo Crosstalk: -94.1 dB
 
 ----
 
 USB Input - Headphone output (16 Bit / 48 kHz)
 
 Noise Level: (1 kHz A-weighted) -92.1 dB
 
 Dynamic Range: (1 kHz A-weighted) -91.6 dB
 
 THD%: 0.0020%
 
 Stereo Crosstalk: -90.0 dB
 

Connectivity:

 USB input
 
 S/PDIF Input
 
 Digital Coax
 
 Toslink Optical
 
 Line Outputs RCA Jacks (1 set)
 
 Headphone Jack 1/4" (6.4mm)