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Firestone Audio Fubar4-Plus
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.
The 192 kHz upsampling will give you the clearest sound you heard from a digital source !
Features
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USB input: Plug & Play via USB. Requires no addition software or drivers
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S/PDIF inputs: Digital inputs for both Digital Coax and Optical, with 24 Bit 96kHz DAC.
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Headphone Output: 1/4" (6.4mm) headphone jack. This amplifier will perfectly drive bigger audiophile headphones with ease.
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Gain Switch: External gain switch to optimize with your headphones. Compatible with 32 - 600 Ohm impedance.
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192 kHz Upsampling: Will give you more natural performance.
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RCA Outputs: Gold Plated RCA outputs to connect to your home stereo for playback over speakers.
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Volume Control: Controls headphone output only, not the line-out RCA outputs, wich are fixed level line-out
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Changeable OpAmps: The OPA2604 OpAmp in the headphone amplifier are changable.
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Color of faceplate: Available in your choice of Black and Silver face plates.
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Specifications
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Amplifier Structure: Coupling Capacitor Less / Push-Pull
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Line Level Output: RCA output 2 Vrms
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Gain Control: High setting (normal) / Low setting provides 20dB attenuation
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Volume Control: Series / Shunt - user selectable (default is Series)
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Headphone Impedance: 32 Ohm to 600 Ohm
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Circuit Protection: Output Short / Over Current Protection
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USB Support Format: 16 Bit - 32 / 44.1 / 48 kHz (compatible with Windows, Mac and Linux)
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S/PDIF Support Format: 24 Bit / 96 kHz
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Upsampling: up to 192 kHz
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Input select: Auto Select - USB highest priority
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USB Chip: CMedia - CM108
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Reciever: Texas Instruments - DIR9001
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ASRC Chip: Texas Instruments - SRC4192
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DAC Chip: Cirrus Logic - CS4344
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LPF OpAmp: National Semiconductor LM4562
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Main OpAmp: Texas Instruments OPA2604
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Servo OpAmp: Texas Instruments TL072
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Audio Performance
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S/PDIF (Digital Coax and Toslink Optical input) - RCA outputs - (1 kHz Sinewave) 2 Vrms
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Frequency response (From 40Hz to 15kHz) : 40Hz +0.01dB, 15kHz -0.03dB
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Noise Level: (1 kHz A-weighted) -111.9 dB
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Dynamic Range: (1 kHz A-weighted) -111.6 dB
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THD%: 0.0018%
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Stereo Crosstalk: -111.0 dB
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S/PDIF (Digital Coax and Toslink Optical input) - Headphone output (1 kHz Sinewave 2 Vrms)
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Frequency response (From 40Hz to 15kHz) : 40Hz +0.01dB, 15kHz -0.03dB
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Noise Level: (1 kHz A-weighted) -99.7 dB
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Dynamic Range: (1 kHz A-weighted) -99.6 dB
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THD%: 0.0020%
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Stereo Crosstalk: -90.0 dB
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USB Input - RCA outputs (16 Bit / 48 kHz)
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Frequency response (From 40Hz to 15kHz) : 40Hz +0.01dB, 15kHz -0.03dB
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Noise Level: (1 kHz A-weighted) -96.2 dB
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Dynamic Range: (1 kHz A-weighted) -96.2 dB
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THD%: 0.0017%
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Stereo Crosstalk: -94.1 dB
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USB Input - Headphone output (16 Bit / 48 kHz)
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Frequency response (From 40Hz to 15kHz) : 40Hz +0.01dB, 15kHz -0.03dB
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Noise Level: (1 kHz A-weighted) -92.1 dB
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Dynamic Range: (1 kHz A-weighted) -91.6 dB
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THD%: 0.0020%
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Stereo Crosstalk: -90.0 dB
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Connectivity
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USB input
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S/PDIF Input
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Digital Coax
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Toslink Optical
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Line Outputs RCA Jacks (1 set)
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Headphone Jack 1/4" (6.4mm)
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