Fubar IV Plus DAC Headphone Amplifier
The Firestone Audio Fubar IV Plus combines the Fubar II USB DAC and the Cute Curve Headphone Amplifier into one small and convenient unit.
Using the Universal Serial Bus (USB) you can simply plug and play without installing any drivers (with Linux, Mac OS or PC Windows system). Adopting two separate DAC chips, one for specifically for the USB port, and another for the remaining digital inputs ensures better sound quality.
With both Coaxial and Optical digital inputs plus a high quality USB input, you can easily connect the Fubar IV Plus to just about any source. The 192kHz upsampling ensures the sound quality is smooth and extended.
For many users of Samsung and LG TV's with only digital outputs, this little box provides you with a high quality stereo output to feed wireless headphones or your stereo system,* plus a high quality headphone socket for direct cabled connection of your favourite headphones.
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Fubar IV Plus Specs
- Amplifier Structure: Coupling capacitor less, Push-Pull with Class-B
- Linear Output: RCA output 2Vrms, delay time phone out function
- Power Structure: Switching power supply, Soft-Start circuit
- Gain Control: Low (attenuation 20dB)/High (normal)
- Volume Control: Series/shunt mode selectable
- Headphone Impedance: 32 ohm to 600 ohm
- Circuit Protect: Output short/over current protect
- USB Support Format: 16-bit, 32 / 44.1kHz / 48kHz
- SPDIF Support Format: 24-bit / 96kHz (MAX)
- Upsampling: Up to 192kHz
- Input Select: Auto Select, USB input is highest priority
- USB Chip: CMedia - CM108
- Receiver: TI - DIR9001
- ASRC Chip: TI - SRC4192
- DAC Chip: TI - PCM1793
- LPF OPAmp: NS - LM4562
- Main OPAmp: TI – OPA2604
- Servo OPAmp: TI - TL072
Fubar IV Plus S/PDIF
Audio Performance - Line output
(1kHz sine wave, 2Vrms output, 24bit/48kHz)
- Frequency response (From 40Hz to 20kHz) : 40Hz +0.01dB, 15kHz -0.03dB
- Noise level (1kHz, A-Weighted) : -111.9dB
- Dynamic range (1kHz, A-Weighted) : 111.6dB
- THD% : 0.0018%
- Stereo crosstalk : -111.0dB
Audio Performance - Phone output
(1kHz sine wave, 2Vrms output, 24-bit / 48kHz)
- Frequency response (From 40Hz to 20kHz) : 40Hz +0.01dB, 15kHz -0.03dB
- Noise level (1kHz, A-Weighted) : -99.7dB
- Dynamic range (1kHz, A-Weighted) : 99.6dB
- THD% : 0.0020%
- Stereo crosstalk : -90.0dB
Fubar IV Plus USB
Audio Performance - Line output
(1kHz sine wave, 2Vrms output, 16-bit / 48kHz)
- Frequency response (From 40Hz to 20kHz) : 40Hz +0.01dB, 15kHz -0.03dB
- Noise level (1kHz, A-Weighted) : -96.2dB
- Dynamic range (1kHz, A-Weighted) : 96.2dB
- THD% : 0.0017%
- Stereo crosstalk : -94.1dB
Audio Performance - Phone output
(1kHz sine wave, 2Vrms output, 16-bit / 48kHz)
- Frequency response (From 40Hz to 20kHz) : 40Hz +0.01dB, 15kHz -0.03dB
- Noise level (1kHz, A-Weighted) : -92.1dB
- Dynamic range (1kHz, A-Weighted) : 91.6dB
- THD% : 0.0020%
- Stereo crosstalk : -90.0dB
Fubar IV Plus Requirements
- USB interface (USB 1.1)
- Digital Input : 1 of coaxial jack, 1 of optical jack
- Line Output : 1 of RCA jack, 1 of 6.4mm phone jack
- 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