SMSL PA40 Integrated Amplifier - Measurement and Review

[FanatNsk]

Price ~$140

Specification:​

• Line in 2xRCA
• SINAD -78.8dB THD 0,00781% THD+N 0,011% at 5W on load 8 ohm
• Power 2x58W into 8 ohm load with THD+N <1%
• Efficiency 80% at maximum volume without sine wave distortion.
• Class D amplifier chip MA5332
• Digital volume control NJU7391A, remote control.
• High gain and low Input gain
• 5 equalizer mode
• With tone adjustment, treble and bass can be adjusted separately.
• Silent - Pop sound control circuit.
• Integrated impulse power supply, protection against switching on during voltage surges.

Appearance​

Measurements in RightMark Audio Analyzer Pro 4.5​

1. Measurements via RCA input at 1W power with 4 Ohm load​

The noise level graph shows a spike at 19 kHz, but when measured using a 4-8 ohm speaker system Heco Vitas 200 this spike is significantly lower at -115 dB.

2. Measurements via RCA input at 1W power with 8 Ohm load​

The graph with an 8-ohm load shows a rise of up to 1.1 dB in the region of 20 kHz.

3. Measurements on acoustic system Heco Vitas 200 (4-8 Ohm) at 1W power​

This amplifier does not implement the PFFB, so the frequency response follows the impedance fluctuations of the acoustic system.

Measurements in REW (RoomEQWizzard)​

IMD CCIF 0.0096% on 8ohm load at 3.6Wt power

IMD SMPTE 0.022% on Acoustic system Heco Vitas 200 (4-8 ohm) at 1Wt power

Multi-tone signal with Acoustic system Heco Vitas 200 at power 500 mVrms​

Jitter test on Acoustic system Heco Vitas 200

THD at different frequencies, as a load of the acoustic system Heco Vitas 200, power 1W.

THD at different power levels on load 8 ohm​

Max 2x58W at THD <1%

Video review​

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Conclusions​

At a relatively low price ($130), it offers bigger power and characteristics suitable for mid-range and budget desktop speakers. IR remote and EQ make it convenient for use with an external sound source that does not have its own volume control (for example, the SMSL PS200 Pro DAC).

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