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Mayflower O2 Amplifier

Mayflower O2 Amplifier

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Visit Sherwood Forest

While the upper class of audiophiles used to hoard high-end equipment, a modern reincarnation of Robin Hood has designed his own top quality take on headphone amplifiers and shared it with the masses. Based on NwAvGuy’s open source design, the Mayflower O2 Headphone Amp piles years of research into one highly functioning piece of equipment, converting your so-so audio into real live music.

Mayflower O2 Amplifier

Note: This drop includes a US power adapter. At check-out, you have your choice of output between 1/4” (6.3 mm), 1/8” (3.5 mm), or 1/8” with a Bamboo Panel.

Cut Through Controversy

The O2 was made for benchmark performance at an entry level price. Famed Head-Fi suer NwAvGuy spent a tremendous amount of time designing the O2, resulting in an impressive piece of equipment with truly objective power. The first DIY units went out for review and sparked a wave of controversy, but once the controversy subsided, the O2 was left standing as one of the best headphone amplifiers available below $500.

Mayflower O2 Amplifier

Sail the Mayflower

Making the most of open source, Mayflower picked up the design and made their own version. Their resulting product, the Mayflower O2 Headphone Amp, is renowned for its high-end sound, exceptional build quality, and excellent price. Every unit comes with an 1/8” input, but you can choose between an 1/8” and 1/4” output at check-out.

Mayflower O2 Amplifier

Additional options

Bamboo Front Panel with 1/8th Inch Output
Black Metal Front Panel with 1/4th Inch Output


  • Mayflower Electronics
  • Input: 1/8 in (3.5 mm)
  • Outputs: 1/8 in (3.5 mm) or 1/4 in (6.3 mm)
  • Frequency response: +0.01, -0.01 dB (20Hz-20kHz)
  • THD 1 kHz 150 Ohms: 0.0016%
  • THD 1 kHz 15 Ohms: 0.0023%
  • THD 20 Hz 15 Ohms: 0.0023%
  • THD 20 kHz 14 Ohms: 0.010%
  • IMD CCIF 15 Ohms: 0.001%
  • IMD SMPTE: 0.002%
  • Noise (A-weighted): -114 dBu
  • Max output (15 Ohms): 336 mW
  • Max output (33 Ohms): 613 mW
  • Max output (150 Ohms): 355 mW
  • Output impedance: 0.54 Ohms
  • Crosstalk (15 Ohms): 65 dB
  • Channel balance: 0.6 dB
  • Gain: 2.5x and 6.5x
  • Volume potentiometer taper: 15A or 3B
  • 1.0 lbs (0.45 kg)


  • US power adapter (120 V)


All orders will be shipped by Massdrop.

Estimated ship date is Nov 14, 2014 PT.

After the drop ends, payment will be collected and the group’s order will be submitted to the vendor up front, making all sales final. Check the discussion page for updates on your order.

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