MASSDROP Objective 2 Headphone Amp: Desktop Edition (O2 for sale in Portland, OR
MASSDROP Objective 2 Headphone Amp (O2): Desktop Edition. Like new, barely used Headphone amp. Works great, but I shortly after bought an audio interface for my computer that performed the same function. It's a well-regraded headphone amp, I suggest reading about it athttps://drop.com/ . It's a fantastic first amp or backup amplifier and has enough juice to drive 600 Ohm Beyerdynamic DT-990s. Used in a non-smoking environment.Below is the tech specs. Input: RCA Output: 6.35 mm Power: Battery (not included) or AC adapter 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) 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 community. It's an ideal baseline reference amplifier, capable of powering everything from IEMs to HD 800s with linear ease."
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