Woo Audio WA7 Fireflies (3rd Gen)

Sale price$1,399.00

Finish: Black


Nearly a decade ago, Woo set out to create an attractive, high-performance vacuum tube amplifier that will delight the eyes and ears of music lovers. The original WA7 fireflies headphone amplifier/DAC was born. Woo is proud to introduce to you the improved 3rd generation of our award-winning WA7 fireflies.

Keeping the same elegant look that makes WA7 fireflies unique, the new 3rd gen now features a built-in linear power supply making the setup a breeze and a one-box solution. In addition, the 3rd gen employs a balanced headphone output driven by a pair of 12AU7 vacuum tubes. The power output is over 1.5w of power per channel @4 Ohms; ideal for a wide range of power demanding headphones and IEMs. The user-replaceable vacuum tubes can be upgraded at any time to customize the sound to the listener's preference. The class-leading performance ESS SABRE DAC allows the user to enjoy music from streaming services such as TIDAL, Qobuz, Apple Music, and Amazon Music HD in lossless resolution.

You asked for it and Woo listened. The new 3rd gen is also a tube preamplifier enabling the user to integrate WA7 fireflies with their home speakers system or drive a pair of desktop-powered speakers for more ways to enjoy the uncompromised sound. See the quick start guide for all the possibilities of this amazing little cube.


  • Updated to 3rd generation in Sept 2021
  • Compatible with Apple iPhone/iPad, Android devices, Mac and Windows computers, how-to video LEARN MORE
  • Features and functions overview VIDEO
  • Class-A balanced headphone amplifier and DAC
  • Up to 1.5w power output (4.4mm balanced)
  • Tubes: 12AU7 / 5963 driver tubes, self-biasing
  • Premium Polytetrafluoroethylene (PTFE) tube sockets
  • ESS SABRE Audiophile DAC up to 24-bit/384kHz PCM, and up to DSD256 (11.2MHz)
  • XMOS xCORE-AUDIO asynchronous USB compatible with PC, Mac, Android and iOS devices (with Apple CCK or Android OTG adapter), how-to video LEARN MORE
  • High-retention USB connector x 1
  • RCA analog Input x 1
  • 4.4mm (5-pole) by Pentaconn by NIPPON DICS balanced headphone output (recommended)
  • 6.3mm (1/4”) stereo headphone output
  • Compatible with full-size headphones and IEMs (8–600 Ohms) at 99db and below sensitivity
  • Frequency response: 10Hz to 46kHz, -3dB
  • Signal to noise ratio: 100 dB
  • Tube preamplifier function (PRE-OUT):

    • 4.4mm (5-pole) by Pentaconn by NIPPON DICS balanced pre-out output (recommended)
    • 3.5mm (1/8”) stereo pre-out
  • Anodized aluminum chassis, available in midnight black or silver
  • External dimensions with glass: 5.25" (H) x 4.8" (W) x 6" (D)
  • Weight: 8.5 lbs.(3.9kg)
  • Internal linear power supply
  • Operating AC voltage: 115v – 230v (voltage below 115v requires step up transformer)
  • Designed and assembled in New York, USA
  • Three-year limited warranty [learn more]
  • IMPORTANT NOTICE: 4.4mm balanced output is not compatible with headphones and earphones (IEMs) with unbalanced cables. NEVER connect unbalanced to the balanced input / output using adapters, it may cause damage to amplifier or malfunction. For headphones and earphones with unbalanced cables use the 6.3mm unbalanced output instead.

In the box 

  • WA7 Fireflies 3rd gen x 1
  • 12AU7 / 5693 vacuum tube x 2
  • Glass with anti-slip silicone glass pads x 4
  • Standard USB-C [OTG] to B cable x 1
  • AC power cord x 1
  • Quick start guide