"The Fubar IV Plus is the most Tube Sounding
solid state component I've heard in my fifty
years of critical listening. Absolutly Superb!
Well done Firestone Audio."
Antonio Galllo, Houston Tx.

Fubar IV PLUS

192 kHz Upsampling DAC / Headphone Amp
with USB and S/PDIF inputs.

Take your listening experience to an exciting new level with the Fubar 4 Plus.

The Fubar 4 Plus combines a 24 Bit DAC and Hi-End Headphone Amplifier into one exceptional unit. The 192 kHz upsampling feature lets you experience the most life-like and natural sound you'll hear from your digital sources.

Inputs include USB and a high end 24 Bit / 96 kHz DAC with both Digital Coax and Toslink Optical inputs. Listen with your headphones from the 1/4" (6.4mm) jack or send your music directly to your stereo from the RCA outputs.

Premium features include:

• USB input - Play music directly from your computer via USB. Most users will requires no addition software or drivers*
  (*Windows 7 requires updated drivers for USB operation)
  
• S/PDIF inputs - The Fubar 4 has inputs for both Digital Coax and Optical. A hi-end 24 Bit 96kHz DAC lets you listen to to your high definition downloads in the full resolution. You can also connect your CD and DVD player or any device with a digital output.
• Headphone Output - connect your favorite headphones to the 1/4" (6.4mm) headphone jack.
• 192 kHz Upsampling - lets you enjoy a more life-like, natural presentations.
• RCA Outputs - Using the Gold Plated RCA outputs you can connect the Fubar 4 Plus to your home stereo for playback over speakers.
• Volume Control: Machined from a solid aluminum billet, controls the headphone output.
• Gain Switch - The External gain switch lets you optimize the Fubar 4 Plus output for your headphones. Compatible with 32 - 600 Ohm headphones.
• Changeable OpAmps: The OPA2604 OpAmp in the headphone amplifier section is changable allowing you to try the various OpAmps available including the OPA2627 SuperChip
• Choice of Colors: Available in your choice of Black and Silver face plates.
• Fubar USB Installation Guidelines

Detailed 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: Texas Instruments - PCM1793
LPF OpAmp: National Semiconductor - LM4562
Main OpAmp: Texas Instruments - OPA2604
Servo OpAmp: Texas Instruments - TL072

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