Firestone Audio FUBAR IV

Features
USB input: Plug & Play via USB. Requires no addition software or drivers. 16 bit performance
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.
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 with Class-B
  Linear Output:RCA output 2Vrms, delay time phone out funtion
  Power Structure: Switching power supply, Soft-Star circuit
  Gain Control: Low (attenuation 20dB) / High (normal)
  Volume Control: Series / shunt mode selectable
  Headphone Impedence: 32 ohm to 600 ohm
  Circuit Protect: Output short / over current protect
  Support Format: 16-bit, 32 / 44.1kHz / 48kHz
  USB Chip: CMedia - CM108
  Receiver Chip: TI – DIR9001
  DAC Chip: TI – PCM1754
  LPF OPAmp: TI – OPA2134
  Main OPAmp: TI – OPA2604
  Servo OPAmp: TI - TL072

Audio Performance
Audio Performance SPDIF Coaxial / Optical input - RCA Line output (1kHz sine wave, 2Vrms output)
Frequency response (From 40Hz to 15kHz) : 40Hz +0.01dB, 15kHz -0.07dB
Noise level (1kHz, A-Weighted) : -95.4dB
Dynamic range (1kHz, A-Weighted) : 95.1dB
THD% : 0.0034%
Stereo crosstalk : -95.8dB
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Audio Performance Coaxial / Optical input - Headphone output (1kHz sine wave, 2Vrms output)
Frequency response (From 40Hz to 15kHz) : 40Hz +0.02dB, 15kHz -0.07dB
Noise level (1kHz, A-Weighted) : -94.0dB
Dynamic range (1kHz, A-Weighted) : 94.0dB
THD% : 0.0032%
Stereo crosstalk : -80.6dB
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Audio Performance USB input - RCA Line output (1kHz sine wave, 2Vrms output)
Frequency response (From 40Hz to 15kHz) : 40Hz +0.02dB, 15kHz -0.08dB
Noise level (1kHz, A-Weighted) : -93.8dB
Dynamic range (1kHz, A-Weighted) : 93.3dB
THD% : 0.0035%
Stereo crosstalk : -93.5dB
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Audio Performance USB input - Headphone output (1kHz sine wave, 2Vrms output)
Frequency response (From 40Hz to 15kHz) : 40Hz +0.02dB, 15kHz -0.08dB
Noise level (1kHz, A-Weighted) : -90.4dB
Dynamic range (1kHz, A-Weighted) : 90.4dB
THD% : 0.0038%
Stereo crosstalk : -80.7dB

Connectivity
USB input
S/PDIF Input Coaxial
S/PDIF input Toslink optical
Line Outputs RCA Jacks (1 set)
Headphone Jack 1/4" (6.4mm)

System Requirements
Intel® Pentium® 2, Celeron® 800MHz or higher computer system
Microsoft® Windows 2000® (Service Pack 4) or Windows® XP (Service Pack 1)
128MB RAM
Available USB port

  Contain: DC24V 0.5A power adapter (Euro plug), RCA wire, USB wire, User manual, Warranty card, Wrench