The Objective2 Headphone Amplifier is the first design of the US blogger and electrical engineer NwAvGuy which is produced under the Common Creative License
This outstanding performance has now been paired with the ObjectiveDAC (ODAC revB), the latest design of NwAvGuy, a truly transparent 24bit DAC produced by Yoyodyne Consulting
The fully modded version comes with cleaned up front panel, power and input connectors are moved to the back side. Input options include RCA as default and mini USB for the ODAC. RCA input will be switched off automatically once the ODAC gets connected to an USB source.
- 6.4mm Neutrik headphone socket
- build in ODAC with mini USB connector
- RCA input to connect analog sources
- ALPS Stereo Potentiometer
- 230V~ 15 VAC 500mA Power supply (Euro, UK, AU and US supplies available)
- Gain switch (2.5x and 6.5x gain as standard)
- Size 108.5 x 84 x 30 mm (without Knobs and screws)
- Black or Silver case
The O2 will drive all headphones you throw at it with standard gain settings, For high sensitivity in ear monitors (IEM's) and easily driven headphones it is recomended to use unity gain to be able to use more range on your volume control. For headphones that are really inefficient or hard to drive gain can be raised accordingly.
The standard settings should cover 95% of on the market available headphones. Gain settings can be amended to 1x, 2x, 3x, 4x, 5x, 6x, 7x, 8.5x, 10x and 12x. Please choose Non Standard from the Gain Options and specify your desired gain settings in the comments field underneath it.
An USB cable (1m) with ferrite bead to avoid EMI pickup is included.
Measurements ObjectiveDAC (revB):
|Frequency Response, 20-20kHz||+/-0.04 dB|
|THD+N 100 Hz, -0.15dBFS||0.0013%|
|THD+N 20 Hz -0.15dBFS||0.0015%|
|THD+N 10 kHz -0.15dBFS||0.0024%|
|Noise, A-Weighted||– 103 dBu|
|Dynamic Range (A-Weighted)||> 112 dB|
|Dynamic Range (Un-Weighted)||> 109 dB|
|Crosstalk @ 1kHz, -10dBFS (3.5mm)||-86.4 dB|
|Sum of Jitter Components @ 11025 Hz, -1dBFS||-112.3 dB|
|IMD CCIF, -6.03 dBFS, 19/20kHz, 24/96k||0.0005%|
|IMD SMPTE -2 dBFS, 24/96k||0.0008%|
|Linearity @ -90dBFS||-0.08 dB|
|Maximum output||2.10 VRMS|
|Frequency Response||+/- 0.1 dB|
|Noise (ref 400 mV)||-105 dB|
|THD 1 Khz 150 Ohms||0.0016%|
|Output Impedance||0.54 Ohms|
A full list of the measurements can be found in NwAvGuy's blog.