Massdrop CTH + SDAC DAC/Amp

DAC Section

• Massdrop x Grace Design
• DAC chip: AKM AK4452
• Audio formats: Up to 24 bit/96 kHz
• Frequency response, 20Hz–20 kHz: +/-0.02 dB
• THD+N at 20 Hz -0.15 dBFS: 0.0013%
• THD+N at 100 Hz, -0.15 dBFS: 0.0013%
• THD+N at 10 kHz, -0.15 dBFS: 0.0024%
• IMD CCIF, -6.03 dBFS, 19/20kHz, 24/96k: 0.0005%
• IMD SMPTE -6 dBFS, 24/96k: 0.0015%
• Noise, A-weighted:  -105 dBu
• Dynamic range, A-weighted: >114 dB
• Linearity, -90 dBFS: -0.07 dB
• Crosstalk at 1 kHz, -10 dBFS (3.5mm jack): -102 dB
• Sum of jitter components at 11,025 Hz, -1 dBFS: -133 dB
• Maximum output:  2.15VRMS
• USB controller: XMOS XU208-128-TQ64
• Input: USB micro
• Output: 3.5mm TRS
• Power: USB Class 1 (no drivers required for Windows, Mac, or Linux)

Amp Section

• Massdrop x Alex Cavalli
• Frequency response: 20 Hz–20 kHz, -0.2 dB
• Maximum power, 50 ohms: 1W Rms per channel
• Output impedance: < 0.5 ohm at 1 kHz
• THD: < 0.008%, 20 Hz–20 kHz 1 Vrms
• THD: 0.0014% at 1 kHz, 1 Vrms with 50R load
• IMD: 0.002% CCIF 1 Vrms
• SNR: -97 dB, 20 Hz–20 kHz (1 Vrms into 45 ohms)
• Crosstalk: -85 dv at 1 kHz
• Topology: Capacitor-coupled tube hybrid using 6922 tube, single-ended
• Gain: 8x (12 dB)
• Input: RCA
• Output: 4-pin XLR, ¼ in (6.3 mm) TRS headphone jacks
• Protection: Delayed start with muting relay and DC offset detection
• Power supply: Wall wart with 28V DC 1.25A
• Power consumption: Maximum 35W (28V, 1.25A), ~9W idle

Physical

• Chassis material: Anodized aluminum
• Dimensions: 8.3 x 9.1 x 2.2 in (21 x 23 x 5.7 cm)

• 6922 dual-triode vacuum tube
• Power supply
• Cloth storage bag
• Massdrop 1-year warranty