Dual CV 6040

Factory Specifications

Power output: 60 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz +/- 0.4 dB
Total harmonic distortion: 0.01% (1000 Hz)
Input sensitivity: 2.5mV (MM), 200mV (line)
Signal to noise ratio: 70dB (MM), 90dB (line)
Speaker load impedance: 8Ω to 16Ω

Measured Values

Power output: 40 watts per channel into 8Ω (stereo)
Frequency response 20Hz to 20KHz: <0.3dB
Channel imbalance: <0.3dB
DC offset left: 0.8mV
DC offset right: -1.0mV
Amplification: 104 (40.33dB)

1. Maximum Power

Maximum undistorted output of 1KHz sine waveform is applied and measured over 8ohm resistors on both channels. First graph shows oscilloscope screen while second one shows spectral analysis. Amplitude RMS is 18.02v which generates 40.6Watt on 8ohm. This value is significantly lower than the factory specification.

2. Frequency Response

Frequency response in Direct mode is flat within 0.2dB which is satisfactory. Second graph is zoomed version for a better view.

First graph shows Bass and Treble while second one shows Loudness frequency characterystic.

This graph shows Left and Right channel imbalance at 50% Volume level. Difference is approx 0.5 dB which is satisfactory.

3. Residual Noise

These two graphs show residual noise for 0% and 100% Volume position. Noise levels in the lower part of the spectra are significant.

4. Total Harmonic Distorsion

THD graphs for 1W and 20W on 8ohm are shown here.

THD vs Voltage (1 kHz on 8ohm) and THD vs Frequency (1W on 8ohm) are shown respectively.