Massdrop Objective 2 (O2) Headphone Amplifier
Massdrop Objective 2 (O2) Headphone Amplifier
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Baseline Perfect: Desktop Edition

In 2011, audio engineer and blogger NwAvGuy published a post titled “O2 Headphone Amp.” In the blog, he outlined his philosophy on defining sound quality and detailed his ideal audiophile circuit design. This is the Objective 2, NwAvGuy's most famous headphone amplifier. Capable of powering everything from IEMs to HD 800s with linear ease, the O2 is your ideal baseline reference amplifier. This Desktop Edition features a quarter-inch headphone output, RCA inputs, and a rear-mounted power jack. 

Note: At checkout, choose the 110V or 220V adapter, as well as standard gain (2.5x low, 6.5x high) or medium gain (1.0x low, 3.3x high).

This item is in stock and will ship in 2–3 business days with standard shipping. Expedited shipping in the contiguous US is available at checkout. Your payment method will be charged 2 hours after joining. Cancellations are accepted until that time. The drop will launch and end each day to collect purchases.

Massdrop Objective 2 (O2) Headphone Amplifier

Spartan Beginnings

The O2 was made for benchmark performance at an entry-level price, something the audiophile world had never seen before. The design was unorthodox, with forward-facing power and a 3.5-millimeter input, but purists were fine sacrificing convenience for optimal signal pathing on the PCB. NwAvGuy had achieved his goal of designing the ideal no-frills headphone amp.

Massdrop Objective 2 (O2) Headphone Amplifier
Massdrop Objective 2 (O2) Headphone Amplifier
Massdrop Objective 2 (O2) Headphone Amplifier

Community-Driven Design

While NwAvGuy was satisfied with purist input/output/power arrangements, the Massdrop community wanted more options. Following the launch, the O2 discussion lit up with requests—more than 500—for changes to the input, output, and power configuration. You wanted a quarter-inch headphone output, RCA inputs, and a rear-mounted power jack. Thus, the Desktop Edition was born.

Massdrop Objective 2 (O2) Headphone Amplifier
Massdrop Objective 2 (O2) Headphone Amplifier

Specs

  • Input: RCA 
  • Output: 6.35 mm 
  • Power: Battery (not included) or AC adapter (included, select 110V or 220V)
  • Gain: 2.5x and 6.5x / 1.0x and 3.3x (select your configuration)
  • Volume potentiometer taper: Alps 15A or 3B
  • Frequency response: +/-0.1 dB (20 Hz–20 kHz)
  • THD at 1 kHz, 150 ohms: 0.0016%
  • IMD CCIF at 15 ohms: 0.001%
  • IMD SMPTE: 0.002%
  • Noise (ref 400 mV): -105 dB
  • Max output (33 ohms): 613 mW
  • Max output (150 ohms): 355 mW
  • Max output (600 ohms): 88 mW
  • Output impedance: 0.54 ohms
  • Crosstalk (15 ohms): -65 dB
  • Channel balance (50% volume): 0.6 dB
  • Case dimensions: 4.12 x 3.87 x 1.12 in (10.46 x 9.82 x 2.85 cm)
  • Weight: 9 oz (255 g)

Included

  • 110V or 220V AC adapter

Shipping

Domestic (contiguous US) customers will have a choice of shipping options at checkout. The shipping days / arrive by date displayed represent the transit times from the estimated ship date for your order to be delivered.

Estimated ship date is Dec 21, 2017 PT.

Your payment method will be charged 2 hours after purchase. Cancellations are accepted until that time, after which the request will be submitted to vendors to deliver the best delivery time to members, making all sales final. Be sure to check the discussion page for updates.

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