NAD 7140 دليل المستخدم

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7140 S t e reo Receiver
Date of manufacture : Jan 87 - Nov 89
Please note that this document contains the text from the original product brochure, and some technical statements may now be out of date
NAD is internationally recognised as the value leader in Hi-Fi, and the new 7140 stereo receiver provides
an exceptional ratio of performance to price (even by NAD standards).
The tuner section of the 7140 combines the convenience and accuracy of digital frequency-synthesis
tuning with superior ster

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High-current output stage Electrical power is the product of voltage and current, but current flowing through the voice coil is what makes a loudspeaker cone vibrate and reproduce sound. In many amplifiers the out-put current is deliberately constricted by current limiters (protection circuits), in order to allow the use of smaller, cheaper output transistors. But NAD engineers have always known, and other manufacturers have lately begun to realise, that to provide precise electromagnetic contro

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PRE-AMP SECTION Phono input Input impedance (R and C) 47kΩ / 100pF Input sensitivity, (1kHz, ref. rated power) 3.2mV Signal/Noise ratio (A-weighted with cartridge connected) 76dB ref. 5mV THD (20Hz - 20kHz) <0.04% RIAA response accuracy (20Hz - 20kHz) ±0.5dB Line level inputs Input impedance (R and C) 15kΩ / 100pF Input sensitivity (ref. rated power) 160mV Maximum input signal >10V Signal/Noise ratio (A-weighted ref 1W) 88dB Frequency response (20Hz - 20kHz) ±0.5dB Infrasonic filter -3db at 15H

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FM TUNER SECTION Input sensitivity Mono -30dB THD+N 10.3dBf (1.8µV/300Ω) Mono 30dB S/N 14.2dBf (2.8µV/300Ω) Stereo 50dB S/N 36dBf (34µV/300Ω) FM NR off 29dBf (16µV/300Ω) FM NR on Stereo 60dB S/N 46dBf (110µV/300Ω) FM NR off 40dBf (56µV/300Ω) FM NR on Capture ratio (45 - 65dBf) <1.5dB AM rejection (45 - 65dBf) >60dB Selectivity, alternate channel 65dB Image rejection 70dB I F rejection 90dB Harmonic distortion Mono 0.09% Stereo 0.09% Signal/Noise ratio Mono >80dB Stereo >75dB Frequency response ±