NAD Stereo Receiver C740 User Manual

C740 Stereo Receiver  
• 2 x 35 Watts continuous • 50 Watts Dynamic Power into 8 ohms  
• 140 Watts Dynamic Power into 2 ohms • Impedance Sensing Circuit (ISC) topology  
• Full System Remote control • All sockets Gold plated • Tone defeat  
• Pre-out / Main-in • Soft Clipping • 30 Station random presets (AM or FM) in 3 banks  
• 25 kHz tuning steps • MOS-FET RF section and Front-End  
• NAD-Link for remote control capability  
Impedance Sensing Circuit (ISC)  
The NAD C740 is one of the first products to benefit from one of Bjørn  
Erik Edvardsen's latest developments: ISC topology  
NAD receivers have always stood out from the rest, as the engineers never  
compromised the quality of a receiver compared to that of separate  
components. The C740 is an excellent illustration of this philosophy as it is  
the combination of the C440 tuner and C340 amplifier combined in one  
chassis. The only difference is the slightly lower output power of the C740  
compared to the C340, but otherwise the C740 is literally the sum of the  
separate components. NAD refers to this concept as “Building Block”.  
The ISC topology allows the C740 to deliver maximum performance under  
virtually any circumstance, independent of the loudspeakers it is driving.  
The circuitry automatically recognizes the impedance characteristics of the  
loudspeaker and will then adjust its power supply settings to best cope  
with that specific load. This also gives it an unusual characteristic  
compared to traditional amplifiers when measuring its continuous output  
power; the RMS output power remains the same at 35 Watts with either an  
eight or a four ohms load. This is not unusual for NAD however.  
NAD takes a stance to the mindless “brochure power” approach which  
doesn't give a realistic indication of an amplifier's true capabilities.  
Instead, the ISC topology is a practical approach to enable an amplifier to  
easily deal with dynamics and difficult loads. More meaningful are the  
C740's dynamic capabilities; up to 140 Watts into 2 ohms and up to 30  
amps current capability!  
Features  
The C740 is fully remote controlled and comes supplied with the NAD C  
Series system remote control. As the C740 also has NAD Link the remote  
control will operate many other NAD products such as CD players, tuners etc.  
Flexibility is another NAD strong point. The C740 has 6 line inputs  
(including 2 tape in/outputs with dubbing facility) and the pre-amplifier  
section can be separated from the power amplifier for easy upgrades (bi-  
amping, for instance) or adding ancillary equipment without making the  
C740 redundant. The headphone socket will drive virtually any non-  
electrostatic headphone.  
Design  
With 30 presets available you can store all your favorite radio stations.  
These presets can be any combination of AM and FM stations: 25 presets  
for FM and 5 for AM, or 17 for FM and 13 for AM, for instance. You can  
store the presets in any of the three different banks, labeled A, B or C.  
This way you can organize the presets to suit personal preferences. When  
attempting to listen to weak stations, the BLEND function reduces the  
background noise while still retaining adequate stereo separation.  
The C740 will allow you to individually name each preset with up to  
8 characters. Once you have named your presets you don't need to  
remember which frequency goes with what radio station, the name is  
indicated in the display every time the preset is recalled. Auto Search  
automatically stops at the next strong radio signal it comes across  
and optimizes tuning. Weaker radio stations can be tuned into manually.  
The MOS-FET RF section and Front-End design together with high quality  
components and careful PCB layout guarantees excellent sensitivity with  
low intermodulation distortion to provide noise-free reception. Although  
AM can never reach the quality of any FM transmission, the Model C740's  
AM section retains excellent clarity together with low background noise.  
The traditional but still very valid and useful NAD features such as Soft  
Clipping and Pre-out/Main-ins remain, and all the in- and output sockets  
are gold plated for long-term contact reliability.  
Other design features include the generous power supply with over-rated  
output devices further lead to low noise and low distortion for the entire  
amplifier. Although the protection circuitry will protect the amplifier  
against blatant cases of abuse, such as short circuiting the speakers, it  
doesn't intrude on or impair the integrity of the signal even under the most  
demanding conditions. Its superb build quality, using selected, close-  
tolerance components and excellent finish with aluminum front panel  
ensure that the C740 is a receiver that will provide many years of excellent  
and trouble-free performance.  
 
PRELIMINARY SPECIFICATIONS - NAD C 740  
Continuous average power output into 8Ω  
35W (15.4dBW)  
(Min power per channel, 20Hz - 20kHz both channels driven with no more than rated distortion)  
Rated distortion  
Clipping power  
(THD 20Hz - 20kHz)  
0.03%  
40W  
(max continuous power per channel)  
IHF dynamic headroom at 8Ω  
1.5dB  
IHF dynamic power  
(max short term power per channel)  
850W (17dBW)  
490W (19.5dBW)  
2140W (21.5dBW)  
<0.03%  
THD  
(20Hz - 20kHz, from 250mW to rated power)  
Signal to noise ratio  
A weighted; ref. 1W 90dB  
A weighted; ref. rated power 104dB  
Headphones output impedance  
Treble control  
Bass control  
220Ω  
±5dB at 10kHz  
±7dB at 100Hz  
FM Tuner Section  
Usable input sensitivity  
FM Mono 11.2 dBf, 1.0 µV, IHF, 0.9 µV, DIN  
FM Stereo 17.2 dBf, 2.0 µV, IHF, 20 µV, DIN  
FM Mono 16.1 dBf, 1.7 µV  
FM Stereo 36.1 dBf, 20 µV  
2.5 dB  
50 dB Quieting sensitivity  
Capture Ratio (FM)  
Harmonic Distortion  
FM Mono 0.1%  
FM Stereo 0.15%  
@1kHz >45dB  
± 1.5 dB 30Hz - 15 kHz  
Channel separation  
Frequency Response  
AM Tuner Section  
Usable Sensitivity  
Selectivity  
IF Rejection  
Signal / Noise Ratio  
Harmonic Distortion  
10 mV  
30 dB  
40 dB  
40 dB  
0.7%  
Physical Specifications  
Dimensions (W x H x D)  
17.125" x 3.375" x 11.5"  
(435 x 110 x 290mm)  
17.8lbs (8.1kg)  
Net weight  
Shipping weight  
20lbs (9.1kg)  
Appearance and features are tentative.  
NAD reserves the right to change specifications or design at any time without notice. All specifications are those in effect at time of printing.  
Printed in Canada.  
 

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