Woo Audio WA7 Fireflies Class-A Tube Amp and 32-bit USB DAC

Woo Audio

The WOO Audio WA7 "Fireflies" Amp/DAC is a combination of high performance vacuum tube headphone amplifier with a built-in USB Digital-to-Analog Converter.

  • It is a pure tube design, utilizing 6C45 tubes in a class-A, single-ended topology, with transformer coupled outputs. There are no semi-conductors used in the entire signal path. The D-A converter is designed to be capable of up to 32-bit/192k sampling rates. This maintains pure data integrity, which is transmitted via standard high speed USB 2.0 interface operating in asynchronous mode.

    The high quality construction features include a pair of Nickel Alloy core output transformers, all-aluminum chassis with no screws visible from any viewing angles, a linear external power supply for amplification circuitries, a custom built toroidal power transformer, and multi-layer military grade PCBs.

    The dedicated port for in-ear-monitors carries a full range of volume controls ensuring minimal noise. Despite its incredibly compact size, "Fireflies" is a power-house with the capacity to drive almost any demanding audiophile headphones. To accommodate different system setup needs, "Fireflies" can also be used as a stand-alone D-A Converter.

    • Handmade output transformer with Nickel Alloy core
    • 32-Bit, 192kHz high resolution playback
    • Ultra-low jitter USB 2.0 runs on Asynchronous mode
    • High and low impedance output via switch
    • Open load protection will automatically engage to prevent the amp from damaging when no headphones are plugged in
    • Multi-functional switch for USB input, RCA input, and RCA output via D-A.
    • All-aluminum chassis with no screws visible from any viewing angles
    • High clarity tube protection glass
    • Multi-layer military grade PCBs
    • Customized driver for Windows Vista/XP/7/8
    • USB Audio Class 2.0 is natively supported by Apple OS X version 10.6.4 and above without installing driver
  • Single-ended, class-A, transformers output

    Linear external high-performance power supply

    Two 6C45 driver/power tubes

    Headphones impedance: 8-600 Ohms

    Input impedance: 100 Kilo-Ohms

    Sampling rate: up to 32-Bit, 192kHz

    Inputs: 1 Asynchronous USB2.0, 1 RCA

    Outputs: 1 1/4" and 1 1/8" headphone outputs, 1 RCA (same connector as the input)

    Max output: approx 1 watt @ 32 ohms

    Frequency response: 11Hz to 27kHz, +/-0.5dB

    Distortion: <0.03%

    S/N: 95dB

    Mains supply: 100-120V, 220-240V, 50/60Hz, user selectable

    Finish: Anodized aluminium

    DC cord length: 4.25 ft or 1.3 m

    Dimension: AMP: 4.8" L x 4.8" W x 5.1" H with glass

    PSU: 7.5" L x 3.5" W x 2.2" H

    Weight: AMP - 5.3 lbs / 2.4kg, Glass - 3.3 lbs / 1.5kg