Integrated Amp Reviews

Two channels driven continuously into 8-ohm loads:
0.1% distortion at 5.8 watts
1% distortion at 182.0 watts

Two channels driven continuously into 4-ohm loads:
0.1% distortion at 11.2 watts
1% distortion at 233.4 watts

Analog frequency response:
–29.52 dB at 10 Hz
–12.56 dB at 20 Hz
–0.42 dB at 20 kHz
–5.78 dB at 50 kHz

48 kHz PCM frequency response:
–29.08 dB at 10 Hz
–9.71 dB at 20 Hz
–0.65 dB at 20 kHz
–1.62 dB at 24 kHz.

This graph shows that the Rialto 400’s left amplifier channel, with two channels driving 8-ohm loads, reaches 0.1% distortion at 5.8 watts, 0.2% distortion at 62.9 watts, and 1% distortion at 182.0 watts. Into 4 ohms, the amplifier reaches 0.1% distortion at 11.2 watts, 0.2% distortion at 133.8 watts, and a maximum of 233.4 watts before protection engaged and interrupted the signal. Please note that even with the bass control set to minimum, the response is +1.62 dB at 50 Hz before dropping back to 0 dB at 36Hz, –3 db at 30Hz, and –6 dB at 26Hz.

THD+N from the amplifier was less than 0.032% at 1 kHz when driving 2.83 volts into an 8-ohm load. Crosstalk at 1 kHz driving 2.83 volts into an 8-ohm load was –52.35 dB left to right and –50.57 dB right to left. The signal-to-noise ratio with an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –98.81 dBrA.—MJP