Audio Segment

Dual CV 5670

The Dual CV 5670 is an integrated amplifier developed for the high-fidelity market under the Audiophile Concept line. It features a high-current design and a specially engineered high-power toroidal transformer, delivering stable and consistent output even during demanding musical passages.

1. Dual CV 5670 - Front View1. Front View
2. Dual CV 5670 - Zoomed2. Zoomed
3. Dual CV 5670 - Left View3. Left View
4. Dual CV 5670 - Rear View4. Rear View
5. Dual CV 5670 - Inside View5. Inside View
6. Dual CV 5670 - Output Transistors6. Output Transistors
7. Dual CV 5670 - Power Supply7. Power Supply
8. Dual CV 5670 - Power Supply8. Power Supply
9. Dual CV 5670 - Input Selector Board9. Input Selector Board
10. Dual CV 5670 - Inside View10. Inside View
11. Dual CV 5670 - Bottom View11. Bottom View
12. Dual CV 5670 - Bottom View12. Bottom View
13. Dual CV 5670 - Cleaning Relays13. Cleaning Relays
14. Dual CV 5670 - Bias Adjusting14. Bias Adjusting

General Specifications

Maximum power (8Ω): 100W
Frequency response (-3dB): 9Hz-95kHz
THD (1kHz): <0.01%
Signal to noise ratio (Line): 100dB
Signal to noise ratio (MM): 80dB
Crosstalk attenuation: 80dB
Input sensitivity (Line): 200mV
Input sensitivity (MM): 2.5mV
Speaker load impedance: 8Ω-16Ω

Dimensions (WHD): 440×142×303mm
Weight: 9.5kg
Produced: 1989-1992
Initial price: 900DM

Measured Values

Maximum power (8Ω): 106W
Frequency response (20Hz-20kHz): <0.5dB
Channel imbalance: <1.0dB
THD (1kHz, 1W): 0.012%
THD+N (1kHz, 1W): 0.019%
THD (1kHz, 20W): 0.0012%
THD+N (1kHz, 20W): 0.0014%
IMD (70Hz, 5kHz, 1W): 0.043%
Noise: -66.4dB
Amplification: 133.4
DC offset L: -16.3mV
DC offset R: -13.3mV

Maximum Power

Maximum power is measured using 8Ω resistors on both channels. A 1kHz sine wave input signal is applied and gradually increased until higher harmonics rise significantly. Typically, this is the point at which output clipping occurs.

15. Dual CV 5670 - Maximum Power - Left Chanel15. Maximum Power - Left Chanel
16. Dual CV 5670 - Maximum Power - Right Chanel16. Maximum Power - Right Chanel

Frequency Response

Frequency response is measured using several equilizer settings. 'Flat' indicates the tone controls are either turned off or set to their neutral position. 'Max' and 'Min' refer to the maximum and minimum tone control positions, respectively. In the phono section, the expected response follows the RIAA equalization curve.

17. Dual CV 5670 - Tone Off - Left Chanel17. Tone Off - Left Chanel
18. Dual CV 5670 - Tone Off - Right Chanel18. Tone Off - Right Chanel
19. Dual CV 5670 - Max Equilizer - Left Chanel19. Max Equilizer - Left Chanel
20. Dual CV 5670 - Max Equilizer - Right Chanel20. Max Equilizer - Right Chanel
21. Dual CV 5670 - Min Equilizer - Left Chanel21. Min Equilizer - Left Chanel
22. Dual CV 5670 - Min Equilizer - Right Chanel22. Min Equilizer - Right Chanel
23. Dual CV 5670 - Subsonic - Left Chanel23. Subsonic - Left Chanel
24. Dual CV 5670 - Subsonic - Right Chanel24. Subsonic - Right Chanel
25. Dual CV 5670 - Loudness - Left Chanel25. Loudness - Left Chanel
26. Dual CV 5670 - Loudness - Right Chanel26. Loudness - Right Chanel
27. Dual CV 5670 - Phono MM Input - Left Chanel27. Phono MM Input - Left Chanel
28. Dual CV 5670 - Phono MM Input - Right Chanel28. Phono MM Input - Right Chanel
29. Dual CV 5670 - Phono MC Input - Left Chanel29. Phono MC Input - Left Chanel
30. Dual CV 5670 - Phono MC Input - Right Chanel30. Phono MC Input - Right Chanel

Residual Noise

These graphs display the noise levels at various volume positions. To eliminate any interference from the input signal, the input lines are shorted during the measurement. Generally, the noise is highest at the mid-point of the volume range (50%)

31. Dual CV 5670 - Noise - Volume 0% - Left Chanel31. Noise - Volume 0% - Left Chanel
32. Dual CV 5670 - Noise - Volume 0% - Right Chanel32. Noise - Volume 0% - Right Chanel
33. Dual CV 5670 - Noise - Volume 50% - Left Chanel33. Noise - Volume 50% - Left Chanel
34. Dual CV 5670 - Noise - Volume 50% - Right Chanel34. Noise - Volume 50% - Right Chanel
35. Dual CV 5670 - Noise - Volume 100% - Left Chanel35. Noise - Volume 100% - Left Chanel
36. Dual CV 5670 - Noise - Volume 100% - Right Chanel36. Noise - Volume 100% - Right Chanel

Distorsion

Total harmonic distortion (THD) is measured using a 1kHz sine wave input, with the output level adjusted to meet different conditions. Intermodulation distortion (IMD) is measured using 'two sine' input signal. THD versus voltage is measured with a 1kHz sine wave input, while THD versus frequency is measured at various output levels.

37. Dual CV 5670 - THD 1W 8Ω - Left Chanel37. THD 1W 8Ω - Left Chanel
38. Dual CV 5670 - THD 1W 8Ω - Right Chanel38. THD 1W 8Ω - Right Chanel
39. Dual CV 5670 - THD 20W 8Ω - Left Chanel39. THD 20W 8Ω - Left Chanel
40. Dual CV 5670 - THD 20W 8Ω - Right Chanel40. THD 20W 8Ω - Right Chanel
41. Dual CV 5670 - IMD 1W 8Ω - Left Chanel41. IMD 1W 8Ω - Left Chanel
42. Dual CV 5670 - IMD 1W 8Ω - Right Chanel42. IMD 1W 8Ω - Right Chanel
43. Dual CV 5670 - THD vs Voltage 1KHz 8Ω - Left Chanel43. THD vs Voltage 1KHz 8Ω - Left Chanel
44. Dual CV 5670 - THD vs Voltage 1KHz 8Ω - Right Chanel44. THD vs Voltage 1KHz 8Ω - Right Chanel
45. Dual CV 5670 - THD vs Frequency 1W 8Ω - Left Chanel45. THD vs Frequency 1W 8Ω - Left Chanel
46. Dual CV 5670 - THD vs Frequency 1W 8Ω - Right Chanel46. THD vs Frequency 1W 8Ω - Right Chanel
47. Dual CV 5670 - THD vs Frequency 20W 8Ω - Left Chanel47. THD vs Frequency 20W 8Ω - Left Chanel
48. Dual CV 5670 - THD vs Frequency 20W 8Ω - Right Chanel48. THD vs Frequency 20W 8Ω - Right Chanel