Just received this email from Massdrop:
Hi everyone, The Massdrop x THX AAA™ 789 Linear Amplifier is making its way through production! We also have some important updates to share about the gain specifications. We worked with THX to adjust the gains for the primary use case of the Audiophile community. Previously, the gains were optimized for variance in source output power. Most Audiophiles typically use 2V DAC sources and wish to drive in-ear monitors or hard-to-drive headphones. With these slight changes there were some updates to the gain specifications, which we have listed below: General: Frequency response: + 0.01 dB / - 0.03 dB 20 Hz–20 kHz; + 0.05 dB / - 0.15 dB 10 Hz–50 kHz Balanced Output: THD: -130 dB, 32 ohms, 1 mW: 0.000032% THD: -130 dB, 32 ohms, 100 mW: 0.000032% THD: -122 dB, 16 ohms, 1 mW: 0.000080% THD: -122 dB, 16 ohms, 100 mW: 0.000080% Gain: 0.66x , 2.0x, 6.6x (-4, +6, +16 dB), selectable via front switch Single-Ended Output: Output power: 1800 mW, 32 ohms, <1% THD (watts per channel) THD: -135 dB, 300 ohms, 100 mW: 0.000018% THD: -133dB, 32 ohms, 100 mW: 0.000022% THD: -130 dB, 16 ohms, 1 mW: 0.000032% THD: -125 dB, 16 ohms, 100 mW: 0.000056% Gain: 0.33x , 1.0x, 3.3x (-10, 0, +10 dB), selectable via front switch We’re on track to meet our estimated ship date of October 31, and we'll check back in around the middle of October with the status of the shipment.