Akai AA-1040
The Akai AA-1040 is a vintage stereo integrated amplifier from the late 1970s, designed for audiophiles seeking high-quality sound reproduction. Known for its solid construction and warm audio signature, the AA-1040 is a testament to Akai's reputation for excellence in audio equipment during the golden era of Hi-Fi.
General Specifications
Maximum power (8Ω): 40WFrequency response (-3dB): 7Hz-70kHz
THD+N: 0.15%
Signal to noise ratio (Line): 90dB
Signal to noise ratio (Phono): 80dB
Input sensitivity (Line): 150mV
Input sensitivity (Phono): 3mV
Chanel separation (Phono): 60dB
Speaker load impedance: 8Ω-16Ω
Dimensions (WHD): 480×155×390mm
Weight: 12.8kg
Produced: 1976
Initial price: 1000DM
Measured Values
Maximum power (8Ω): 48WFrequency response (20Hz-20kHz): ±0.3dB
Channel imbalance: <2.0dB
THD (1kHz, 1W): 0.017%
THD+N (1kHz, 1W): 0.11%
THD (1kHz, 20W): 0.045%
THD+N (1kHz, 20W): 0.049%
IMD (70Hz, 5kHz, 1W): 0.063%
Noise: -41.7dB
Amplification: 132.6
DC offset L: 16.3mV
DC offset R: 15.2mV
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.
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.
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%)
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.
FM Tuner
Measurements of the tuner section were performed using an FM signal generator, with its output fed directly into the antenna input. AM measurements were not conducted.
