Firestone Fubar 4 Plus er en superb 24Bit/192kHz upsampling DAC + integreret hovedtelefon forstærker + RCA outputs (analog) til at forbinde til dit HiFi anlæg. Her kan du få HiFi musik direkte fra din PC til dit anlæg, eller du kan bruge den indbyggede hovedtelefonforstærker til at drive dine hovedtelefoner. Lydkilden kan enten være USB eller S/PDIF, coaxial eller optical. 
Med den indbyggede 192 kHz upsampling får du den klareste lyd du har hørt fra en digital kilde. 



Fubar 4 Plus leveres i Sort og Sølv og leveres med 6mm hovedtelefonstik. Vær venlig at skrive hvilken farve, der ønskes men tag forbehold for at vi ikke altid har alle farver på lager!

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 only, not the line-out RCA outputs, wich are fixed level line-out 
• 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
• Frequency response (From 40Hz to 15kHz) : 40Hz +0.01dB, 15kHz -0.03dB
• 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

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• S/PDIF (Digital Coax and Toslink Optical input) - Headphone output (1 kHz Sinewave 2 Vrms)
• Frequency response (From 40Hz to 15kHz) : 40Hz +0.01dB, 15kHz -0.03dB
• 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

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• USB Input - RCA outputs (16 Bit / 48 kHz)
• Frequency response (From 40Hz to 15kHz) : 40Hz +0.01dB, 15kHz -0.03dB
• 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

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• USB Input - Headphone output (16 Bit / 48 kHz)
• Frequency response (From 40Hz to 15kHz) : 40Hz +0.01dB, 15kHz -0.03dB
• 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)