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Power amplifiers stereo — SMSL PA400
Description, images, technical data and specifications
SMSL PA400
Image source — © SMSL
The PA400 is a stereo power amplifier from SMSL, sitting above the PA200 with a substantial input impedance and strong signal-to-noise figure. The PA400 brings SMSL's more accomplished current engineering to dedicated stereo power amplification.
Key specs that matter
Input sensitivity is 960mV via RCA or 2,100mV via XLR, with input impedance at 22,000 ohms on both connections. Output power is 200W into 8 ohms, rising to 250W into 4 ohms. Signal-to-noise ratio is a strong 115dB, with total harmonic distortion plus noise at 0.003% at 100% global feedback. Maximum power consumption is a modest 40W relative to the substantial output power. At 254 x 47.7 x 242mm and 2.58kg, the PA400 maintains a compact power amplifier chassis given its substantial output power, suggesting efficient Class D amplifier technology.
Sound and use context
Expect exceptionally clean amplification reflecting the strong 115dB signal-to-noise figure combined with the modest 40W power consumption relative to output, representing exceptional efficiency and value.
Pairing
The substantial 250W-into-4-ohms output handles demanding loudspeaker loads with confidence.
Alternatives
SMSL's own PA200 offers a more compact, lower-power alternative within the same broader power amplifier catalogue.
Key specs that matter
Input sensitivity is 960mV via RCA or 2,100mV via XLR, with input impedance at 22,000 ohms on both connections. Output power is 200W into 8 ohms, rising to 250W into 4 ohms. Signal-to-noise ratio is a strong 115dB, with total harmonic distortion plus noise at 0.003% at 100% global feedback. Maximum power consumption is a modest 40W relative to the substantial output power. At 254 x 47.7 x 242mm and 2.58kg, the PA400 maintains a compact power amplifier chassis given its substantial output power, suggesting efficient Class D amplifier technology.
Sound and use context
Expect exceptionally clean amplification reflecting the strong 115dB signal-to-noise figure combined with the modest 40W power consumption relative to output, representing exceptional efficiency and value.
Pairing
The substantial 250W-into-4-ohms output handles demanding loudspeaker loads with confidence.
Alternatives
SMSL's own PA200 offers a more compact, lower-power alternative within the same broader power amplifier catalogue.
Specifications
Model name
PA400
Input sensitivity (mV)
960 (RCA), 2100 (XLR)
Input impedance (balanced) (Ω)
22 000
Input impedance (single-ended) (Ω)
22 000
Output impedance (balanced) (Ω)
N/A
Output impedance (single-ended) (Ω)
N/A
Max current (A)
N/A
Output power (8Ω) (W)
200
Output power (4Ω) (W)
250
Gain (dBu)
N/A
Frequency response low +/- 3dB (Hz)
N/A
Frequency response high +/- 3dB (Hz)
N/A
Signal to Noise Ratio (dB)
115
Total Harmonic Distortion + Noise (0% global feedback) (%)
N/A
Total Harmonic Distortion + Noise (100% global feedback) (%)
0.003
Max power consumption (W)
40
Damping factor
N/A
Dimensions (mm)
254 x 47.7 x 242
Weight (kg)
2.58
Official link
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