Massdrop Objective 2 Headphone Amp: Desktop Editionsearch
In Stock:This product is ready to ship within 1 business day.

Massdrop Objective 2 Headphone Amp: Desktop Edition

Massdrop Objective 2 Headphone Amp: Desktop Edition

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Baseline Perfect

In 2011, audio engineer NwAvGuy published a blog post titled “O2 Headphone Amp,” in which he outlined his philosophy on defining sound quality and detailed his ideal audiophile circuit design. Our version of NwAvGuy's famous O2 amplifier, the Objective 2 Desktop Edition features updates based on feedback from the Massdrop community. It’s an ideal baseline reference amplifier, capable of powering everything from IEMs to HD 800s with linear ease. 

Note: This item is in stock and will ship within 1 business day 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. 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).

Community-Driven Design

The O2 was made for benchmark performance at an entry-level price, something the audiophile world had never seen before. But while NwAvGuy was satisfied with purist input, output, and power arrangements, the Massdrop community wanted more options. Following the initial launch of the Massdrop Objective O2, the discussion lit up with more than 500 requests for changes to the input, output, and power configuration. Members asked for a quarter-inch headphone output, RCA inputs, and a rear-mounted power jack, and we were happy to oblige. Thus, the Desktop Edition was born.

Massdrop Objective 2 Headphone Amp: Desktop Edition


  • 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)


  • 110V or 220V AC adapter (add plug adapter for your country’s outlet)


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 Oct 18, 2018 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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