NAD 7400 Manuel utilisateur

7400

Stereo Receiver

Date of manufacture : ? - 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note that this document contains the text from the original product brochure, and some technical statements may now be out of date

The 7400 Receiver (composed of circuitry from the 2400 Power Amp and 1700 Preamplifier/Tuner) was

designed according to the same principles as the 7l00, but it is approximately twice as powerful and has

additional refinements, including semi-parametric tone controls and convenient analogue style knob

tuning.

While the 7400 is conservatively rated at 100 watts per channel continuous power for test tones, its

Power Envelope circuit produces upwards of 370 watts per channel of long-term dynamic power for

music, with a peak current of 40 amperes for precise control of voice-coil motion with speaker

impedances as low as 2 ohms. For still more power, a rear-panel bridging switch converts the output

stage into a mono amplifier rated at 200 watts continuous power and 800 watts of tone-burst power

for music, The companion 2400 Power Amplifier may be added for stereo.

Semi-parametric tone controls combine the the simplicity of ordinary bass and treble controls with the

flexibility of a two-band parametric equaliser. Bass EQ) strengthens the deep bass while infrasonic

filtering prevents muddy intermodulation distortion. Ultra-quiet line-level circuits, including a feedback-

operated volume control that reduces noise as its gain is lowered, provide a signal/noise ratio exceeding

that of any source, analogue or digital. Dual tape circuits (with independent two-way dubbing and

monitoring and external preamp-out/main-in connections make it easy to upgrade your system at any

time with an equaliser, surround-sound processor, or electronic crossover.

The sensitive and quiet tuner section of the 7400 is controlled by a rotary tuning knob and 14 presets,

combining the natural, intuitive feel of analogue tuning with the precision of digital frequency-synthesis.

Automatic station-seek tuning is included on the remote control. FM NR, selectable I.F. bandwidth, and

numerous internal refinements provide surprising station-pulling power and satisfying sound under

widely varying reception conditions.

PRE-AMP SECTION

Phono input

Input impedance (R and C) MM 47kΩ/ 120pF

MC 47kΩ/ 120pF

Input sensitivity, 1kHz MM 0.28mV ref. 1W

MC 0.02mV ref. 1W

Signal/Noise ratio (A-weighted with cartridge connected) MM 76dB ref. 5mV

MC 76dB ref. 5mV

THD (20Hz - 20kHz) <0.04%

RIAA response accuracy (20Hz - 20kHz) ±0.5dB

Line level inputs

Input impedance (R and C) 50kΩ/ 250pF

Input sensitivity (ref. 1W) 15mV

Maximum input signal >10V

Signal/Noise ratio (A-weighted ref 1W) 96dB

Frequency response (20Hz - 20kHz) ±0.3dB

Line level outputs

Output impedance Pre-amp 600Ω

Tape Source Z + 1kΩ

Maximum output level >10V

Tone controls

Treble ±12dB at 3, 6 or 12kHz

Bass ±12dB at 50, 120 or 250Hz

Bass EQ +3dB at 60Hz

+6dB at 36Hz

Infrasonic filter (Switchable) -3dB at 12Hz, 12dB / octave

POWER AMP SECTION

Continuous output power into 8Ω* 100W (20dBW)

Rated distortion (THD 20Hz - 20kHz) 0.03%

Clipping power (maximum continuous power per channel) 130W

IHF Dynamic headroom at 8Ω+5.7dB

IHF dynamic power (maximum short term power per channel) 8Ω370W (25.7dBW)

4Ω400W (26dBW)

2Ω440W (26.4dBW)

Damping factor (ref. 8Ω, 50Hz) >100

Input impedance 20kΩ/ 600pF

Input sensitivity (for rated power into 8Ω)1V

Frequency response 3Hz - 100kHz +0, -3dB

Signal/noise ratio ref. 1W 98dB

ref. rated power 118dB

THD (20Hz - 20kHz) <0.03%

Bridged Mode

Continuous output power into 8Ω* 200W (23dBW)

IHF Dynamic headroom at 8Ω+6dB

IHF dynamic power (maximum short term power per channel) 8Ω800W (29dBW)

4Ω880W (29.4dBW)

FM TUNER SECTION

Input sensitivity Mono -30dB THD+N 10.3dBf (0.9µV/75Ω)

Mono 50dB S/N 13dBf (1.2µV/75Ω)

Stereo 50dB S/N 25dBf (5µV/75Ω)

Stereo 60dB S/N 35dBf (15µV/75Ω)

Capture ratio (45 - 65dBf) <1.5dB

AM rejection (45 - 65dBf) >65dB

Selectivity, alternate channel 75dB

Selectivity, adjacent channel 7dB

Image rejection >90dB

I F rejection >100dB

Harmonic distortion Mono 0.08%

Stereo 0.08%

Signal/Noise ratio Mono 82dB

Stereo 78dB

Frequency response ±0.5dB 30Hz - 15kHz

Channel separation at 1kHz 50dB

AM TUNER SECTION

Usable sensitivity 300µV

Selectivity 35dB

Image rejection 50dB

I F rejection 50dB

Signal/Noise ratio 45dB

Harmonic distortion 0.5%

Remote Yes

NAD Link No

PHYSICAL SPECIFICATIONS

Dimensions (W x H x D) 435 x 120 x 390mm

Net weight 11.8kg

Shipping weight 13.6kg

Power consumption (120 ~ 240V, 50/60Hz) 390VA

* Minimum power per chnnel, 20Hz - 20kHz, both channels driven with no more than rated distiortion.

Dimensions are of unit’s cabinet without attached feet; add up to 18mm for total height.

Dimension depth excludes terminals, sockets, controls and buttons.

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