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Woo Audio WA7 Fireflies 2nd Generation Tube DAC/Amp

Woo Audio WA7 Fireflies 2nd Generation Tube DAC/Amp

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Product Description
Woo Audio’s first WA7 Fireflies DAC/amp was a big hit among audiophiles. Now, the brand is back—and the fireflies are flying again Read More

Light Up Your Audio With Second-Gen Performance

Woo Audio’s first WA7 Fireflies DAC/amp was a big hit among audiophiles. Now, the brand is back—and the fireflies are flying again. Introducing the WA7 Fireflies 2nd Gen: an all-vacuum-tube, transformer-coupled headphone amp and USB DAC that outperforms its predecessor. Supporting both 24-bit, 384-kilohertz PCM and DSD64/128 high-resolution playback, the Fireflies 2nd Generation takes a big leap in sonic detail compared to the first generation. It also features new premium Teflon tube sockets to optimize the amplification characteristics of its two SOVTEK 6C45 vacuum tubes, plus an RCA output for improved connectivity in DAC mode. Completing the Fireflies 2nd Gen, these features and more come packed in an elegant aluminum chassis and high-clarity glass block with a minimal desktop footprint. 

Note: At checkout, choose the WA7 in black or silver, choose AC110 (US power cord) or AC220 (EU power cord) power options, and choose the Standard Solid State Power supply (base price) or the WA7tp Upgraded Power Supply (+ $509). 

Woo Audio WA7 Fireflies 2nd Generation Tube DAC/Amp
Woo Audio WA7 Fireflies 2nd Generation Tube DAC/Amp
Woo Audio WA7 Fireflies 2nd Generation Tube DAC/Amp

Detailed Audio & Artistic Design

Every aspect of the WA7 Fireflies 2nd Gen is designed for striking sonic and aesthetic impact. The entire unit is handmade, with its tubes encased in a solid slab of glass for tube protection, chassis dampening, and a truly unique visual experience. Held in premium Teflon tube sockets, the tubes themselves are SOVTEK 6C45 vacuum tubes—known for their detail and warm audio characteristics. Together with a maximum power output to headphones of 1 Watt at 32 ohms, and distortion levels lower than 0.03 percent, these components deliver a listening experience worthy of any audiophile’s setup.

Woo Audio WA7 Fireflies 2nd Generation Tube DAC/Amp
Woo Audio WA7 Fireflies 2nd Generation Tube DAC/Amp

Improved Flexibility and Functionality

To fit a wide range of configurations, the WA7 Fireflies 2nd Gen features both asynchronous USB and stereo RCA inputs. The USB input is best for connecting to the computer to enjoy streaming music services such as Spotify, Apple Music, Amazon Music HD, Qobuz and TIDAL. For those spinning vinyl, the Fireflies 2nd Gen’s RCA input makes it easy to connect a phono preamp. On the output side, the Fireflies 2nd Gen features a 6.3-millimeter output for full-size headphones, a 3.5-millimeter output for IEMs, and a new RCA output for expanded connectivity in DAC mode. Another important feature is a rear-facing impedance switch, which you can toggle to synergize with everything from sensitive IEMs to power-hungry dynamics and planar magnetics. 

Woo Audio WA7 Fireflies 2nd Generation Tube DAC/Amp

Your Choice of Detached Power Supplies

To reduce size and eliminate electromagnetic interference, the WA7 comes with a separate power supply, available in your choice of solid-state or tube. The tube option (WA7tp) is a high-performance linear power supply utilizing a pair of 12AU7/5963 tubes as rectifiers to deliver enhanced stereo separation and smoother treble. Designed in-house by Woo Audio, the WA7tp features the same solid construction as the WA7 Fireflies 2nd Gen, ensuring both long-lasting durability and well-matched aesthetics.

Woo Audio WA7 Fireflies 2nd Generation Tube DAC/Amp



WA7 Fireflies 2nd Gen DAC/Amp

  • Single-ended, Class-A, transformers output
  • High- and low-impedance output via toggle switch on back panel
  • Multifunctional switch for USB and RCA input/output (D/A mode)
  • Material: Anodized aluminum, glass
  • Multi-layer PCBs
  • Tubes: (2) 6C45 driver/power tubes
  • Teflon tube sockets
  • (XMOS) USB controller with high-retention USB socket for bit-perfect connectivity
  • ESS SABRE (ES9018K2M) DAC 24-bit/384 kHz PCM, and up to DSD128
  • Headphones impedance: 8 ohms – 600 ohms
  • Input impedance: 100 kohms
  • Inputs: (1) asynchronous USB 2.0, (1) RCA
  • Outputs: (1) RCA (D/A mode), (1) 6.3mm, (1) 3.5mm
  • Maximum output: Approximately 1 W at 32 ohms
  • Frequency response: 11 Hz – 27 kHz, ± 0.5 dB
  • Distortion: <0.03%
  • S/N: 95 dB
  • Power consumption: 25 W max
  • Mains supply: 100 V – 120 V, 220 V –240 V, 50/60 Hz 
  • External linear power supply
  • Automatically engaging open-load protection
  • DC cord length: 4 ft (1.3 m)
  • System support (USB):  System support (USB): Windows, macOS, as well as iOS, and Android with the appropriate adapter 
  • Dimensions: 4.8 x 4.8 x 5.1 in (12.2 x 12.2 x 13 cm) with glass
  • PSU dimensions: 7 x 3.5 x 2.2 in (17.8 x 8.9 x 5.6 cm)
  • Amp weight: 5.3 lbs (2.4 kg)
  • Glass weight: 3.3 lbs (1.5 kg)
  • PSU weight: 2.8 lbs (1.4 kg)

WA7tp Power Supply (+ $509)

  • External linear vacuum-tube power supply
  • Matched pair 12AU7/5963 tubes as rectifiers
  • Anodized aluminum body with no visible screws
  • High-clarity glass block for tube protection and chassis dampening
  • Multi-layer military grade PCBs
  • DC cord length: 1 ft (0.3 m)
  • Mains supply: 100 – 120V, 220 – 240V, 50/60 Hz (factory preset)
  • Power consumption: 25 W max
  • WA7tp dimensions: 4.8 x 4.8 x 5.1 in (12.19 x 12.19 x 12.95 cm)
  • Weight: 9.4 lbs (4.3 kg)


  • (2) 12AU7/5963 tubes for tube power supply
  • (2) SOVTEK 6C45 vacuum tubes
  • (4) anti-slip glass pads with solid-state PSU or (8) anti-slip glass pads with tube power supply upgrade
  • USB-A to USB-B cable
  • US AC power cord with AC110 orders
  • EU style AC power cord for AC220 orders
  • 4 ft (1.2 m) DC cord with solid-state power supply model
  • 1 ft (0.3 m) DC cord with tube power supply model


Estimated ship date is Dec 4, 2020 PT.

Payment will be collected at checkout. After this product run ends, orders will be submitted to the vendor up front, making all orders final.

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