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Integrated amplifiers — Extraudio X251 MKII
Description, images, technical data and specifications
Extraudio X251 MKII
Image source — © Extraudio
The X251 MKII is an integrated amplifier from Extraudio, sharing chassis dimensions with the DAC1 MKII DUAL R2R DAC while offering substantial output power and a remarkable damping factor. The X251 MKII brings Extraudio's considered engineering to a complete integrated chassis.
Key specs that matter
One balanced XLR input and four single-ended RCA inputs are provided. Input impedance is 120k ohms balanced or 60k ohms single-ended. Output power is 300W into 8 ohms, rising to 500W into 4 ohms. Gain is 12dBu via XLR or 6dBu via RCA. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Signal-to-noise ratio exceeds an exceptional 119dB, with total harmonic distortion plus noise at 0.003%, and a remarkable damping factor exceeding 1,000. At 440 x 120 x 400mm and 11kg, the X251 MKII shares identical chassis dimensions with the DAC1 MKII DUAL R2R DAC for a visually coherent stack.
Sound and use context
Expect substantial power delivery combined with exceptionally clean measured performance reflecting the extraordinary 119dB signal-to-noise figure and remarkable damping factor exceeding 1,000, consistent with Extraudio's broader considered engineering standards.
Pairing
Extraudio's own DAC1 MKII DUAL R2R DAC shares matching chassis dimensions for a visually coherent stack, forming a natural companion component.
Alternatives
Extraudio's broader amplifier catalogue offers alternatives for buyers wanting a different balance of features.
Key specs that matter
One balanced XLR input and four single-ended RCA inputs are provided. Input impedance is 120k ohms balanced or 60k ohms single-ended. Output power is 300W into 8 ohms, rising to 500W into 4 ohms. Gain is 12dBu via XLR or 6dBu via RCA. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Signal-to-noise ratio exceeds an exceptional 119dB, with total harmonic distortion plus noise at 0.003%, and a remarkable damping factor exceeding 1,000. At 440 x 120 x 400mm and 11kg, the X251 MKII shares identical chassis dimensions with the DAC1 MKII DUAL R2R DAC for a visually coherent stack.
Sound and use context
Expect substantial power delivery combined with exceptionally clean measured performance reflecting the extraordinary 119dB signal-to-noise figure and remarkable damping factor exceeding 1,000, consistent with Extraudio's broader considered engineering standards.
Pairing
Extraudio's own DAC1 MKII DUAL R2R DAC shares matching chassis dimensions for a visually coherent stack, forming a natural companion component.
Alternatives
Extraudio's broader amplifier catalogue offers alternatives for buyers wanting a different balance of features.
Specifications
Model name
X251 MKII
Type
Integrated Amplifier
Analog inputs (balanced)
1
Analog inputs (single-ended)
4
Input sensitivity (mV)
N/A
Input impedance (balanced) (Ω)
120 000
Input impedance (single-ended) (Ω)
60 000
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
D/A conversion
N/A
Phono MM/MC current-sensing input impedance (Ω)
N/A
Output power (8Ω) (W)
300
Output power (4Ω) (W)
500
Gain (dBu)
12 (XLR), 6 (RCA)
Frequency response low +/- 3dB (Hz)
20
Frequency response high +/- 3dB (Hz)
20 000
Signal to Noise Ratio (dB)
> 119
Total Harmonic Distortion + Noise (%)
0.003
Damping factor
> 1000
Dimensions (mm)
440 x 120 x 400
Weight (kg)
11
Official link
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