If swappable op-amps, an Objective DAC for proper analog sound and a frequency range of 10hz – 19Khz not only makes sense to you but gets you a bit hot and bothered, JDSLabs has an interesting product for you.  Built around the open source Objective2 amplifier this pre-amp and DAC is designed to attempt to produce professional quality sound without the price tag attached to that level of gear.  The suggested price is $285 which might seem high for a headphone amp but is actually much less expensive than professional level kit.  TechPowerUp were very impressed with the quality of the sound and the tweaks possible to make to the DAC but thought that perhaps a bit more thought could have been put into the aesthetics of the device.

"JDSLabs's O2+ODAC combination combines two designs by NwAvGuy with excellent build quality and a sturdy enclosure. The O2+ODAC sells at just $285 which, performance considered, is a bargain. We test whether this amplifier and DAC combination is really the giant slayer it is made out to be!"

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