OPA-4A technical parameters

Output power:
External speaker output: 6W+6W (4-8Ω)

Balanced headphone output: 4000MW+4000MW (32Ω)

Single-ended headphone output: 900MW+900MW (32Ω)

Frequency response: 20Hz ~ 50kHz (-1.5dB)

Harmonic distortion: 0.5% (1kHz)

Signal to noise ratio: 90dB

Input sensitivity: 350mV

Input impedance: 100kΩ

Left and right output balance: <0.5dB

Tubes: 12AU7 x2, EL34 x2

Machine volume (WxDxH): 385mm x290 mm x175 mm

Net weight: 15kg
Working conditions: Temperature: 0 ° C ~ 40 ° C Humidity: 20% ~ 80%

Storage conditions: Temperature: -20 ° C ~ 70 ° C Humidity: 20% ~ 90%