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"Op-amp Rolling” in the Objective 2 Headphone Amplifier ...
https://www.headphonesty.com/2018/03/1667/
The O2 headphone amp uses three DIY-friendly DIP 8 style dual op-amps. It requires op-amps that can operate comfortably at +/- 12 volts (24 volts total). This rules out single devices, surface mount packages, and lower voltage op-amps.
O2/ODAC - Mayflower Electronics
https://mayflowerelectronics.com/o2-odac-overview/
Benchmark Performance. Reference grade, neutral audio reproduction. Enjoy the Objective2 with the ODAC 24 bit DAC. With 600mW of output power, The O2 will drive any headphone on the market. The ODAC (Objective Digital to Analog Converter) connects to any modern operating system with no drivers.
Review: JDS Labs O2 Headphone Amplifier - Neurochrome
https://neurochrome.com/pages/o2-headphone-amp
The O2 comes with a two-page instruction sheet (which has been expanded considerably since I took delivery of my O2: O2 Instructional Guide) and an AC wall wart power supply for charging the batteries. According to the instruction sheet provided …
O2 Op Amp Rolling | Super Best Audio Friends
https://www.superbestaudiofriends.org/index.php?threads/o2-op-amp-rolling.2109/
Other op amps already on my list to try: AD8610. LM4562. AD8512. OPA2209. And for reference, I am testing this with: Foobar2000 -> Schiit Wyrd -> Peachtree Audio X-1 (coax) -> Denon DA-500 -> O2 -> HD650 / Denon AH-D2000 / VSONIC GR07 Classic. And my power supply for my O2 is a 15W / 1A.
O2 Op Amp Rolling | Page 2 | Super Best Audio Friends
https://www.superbestaudiofriends.org/index.php?threads/o2-op-amp-rolling.2109/page-2
For the price, those are about the best two op amps you can get in a PDIP or DIP-8 package IMO. All other DIP-8's (OPA2111, OPA2107, Muse 01, Muse 02) cost way more. The 2111 and 2107 in DIP-8 run about $20 piece and the Muse op armps run about $40. Not sure it is worth it if you are going to give it away.
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