0 ItemsObjective2 Headphone Amplifier
Ready to use Objective2 (O2) headphone amplifier in our custom enclosure. O2 is an open source amplifier designed by NwAvGuy, with emphasis on benchmark performance and low cost.
IN STOCK
IN STOCK
*Current Status*: Ships within 24 hours
The Objective2 (O2) is an open source headphone amplifier designed by NwAvGuy, with emphasis on benchmark performance and low cost. This item includes a fully assembled and hand tested O2 amplifier, ready for use. You will only need an AC adapter suitable for your region.
CNET.com - JDS Labs' overachieving headphone amplifiers
The Objective2 (O2) is an open source headphone amplifier designed by NwAvGuy, with emphasis on benchmark performance and low cost. This item includes a fully assembled and hand tested O2 amplifier, ready for use. You will only need an AC adapter suitable for your region.
The O2 has created a stir in Head-Fi.org’s do-it-yourself community. After being banned from Head-Fi for heated discussion, he proceeded to design O2 for maximum benchmark performance to prove his points. It’s large and heavy, so hardly worth consideration as a portable amp, however, O2 lives up to its name.
For more information on the O2, please refer to NwAvGuy's O2 Details article.
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Remember to select an AC Adapter!
For North America (120V)
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For EU, UK, or AU (220-240V)
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Our Objective2's are assembled 100% in accordance with NwAvGuy's default, high-performance bill of materials:
Alps Dual Analog Potentiometer
3.5mm Input and Output Jacks
Dual Gain Switch (2.5x and 6.5x)
Opamps: JRC NJM2068D, 2x JRC NJM4556AD
AC Jack - Rechargeable 9V NiMH Batteries
Power adapters are sold separately, as we ship worldwide (power standards vary by country). Please refer to the instructions, or our Objective2 Power Adapter Guide for more information. Recommended power adapters include:
The default gain levels of the Objective2 are intended to work well with over 95% of headphones on the market. We use the stock O2 with headphones as low as 16 ohms @ 108 dB/mW, and as high as 600 ohms (very high and very low efficiency, respectively).
There is no reason to change the stock gain unless you regularly listen at extremely low volumes. Gain can easily be changed by removing two resistors.
We can set gain of 1.0x/6.5x or 2.5x/1.0x upon request. Other combinations are also possible, but may delay shipment by 1-3 business days. Simply make your special request(s) during checkout.
There is no reason to change the stock gain unless you regularly listen at extremely low volumes. Gain can easily be changed by removing two resistors.
We can set gain of 1.0x/6.5x or 2.5x/1.0x upon request. Other combinations are also possible, but may delay shipment by 1-3 business days. Simply make your special request(s) during checkout.