sadly the Quantum 2 seems discontinued. it would be great if PreSonus someday revives this model with three changes:
1. two headphone amps
2. native Thunderbolt 3
3. ability to hook up line devices with TRS cables on front inputs (not sure if it was in Quantum 2). like TS is instrument, but TRS is line.
all the rest in Q2 seems perfect, including the software gain controllers (like in original Quantum and unlike Quantum 2626)
PreSonus, please re-introduce the non-rack-mountable compact Quantum