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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





NAD 710 receiver

NAD 710
The NAD 710 receiver combined into one chassis the Model 310 amplifier and 412 tuner. Receivers are often regarded as convenience products only; as a consequence most budget receivers may have many features but poor amplifier and tuner performance. NAD has chosen the other route; trim off all the "fat" and instaed optimise the design and components directly related to performance. The NAD 710 exemplifies this; no loudness controls, mono buttons, phono section, remote control, etc.; just those controls needed for day to day operation. The biggest change to conventional amplifier design is to be found internally, however, courtesy of the Super Simple circuit topology.

The super simple concept - the goal of the NAD engineers was to design a circuit which would an outstanding performance and supreme reliability - yet at a lower cost than using conventional technology. This has resulted in a totally new circuit topology, first used in the Model 310, appropriately named "Super Simple".
The highly unusual arrangement of putput devices and driver stages increases both the current capability and efficiency of the power amplifier. Many amplifiers specified at three times the power will not be able to match the Model 710's 20 Amps peak Current capability. Another benefit of the Super Simple concept is that on average it requires 50% less components compared to a conventional design of similar specification.

The high level of performance is further achieved by using discrete circuitry for the entire amplifier section. The generous power supply employs a Holmgren toroidal transformer and separate voltage rails for the Left and Right channels. Loudspeakers with complex loads (such as low impedances) can be driven with ease.
The tuner section can store up to 24 stations (12 AM; 12 FM). These are stored in a non volatile memory which allows the preset stations to remain in memory even if the unit is unplugged from the mains supply. Auto-Search and manual tuning is provided for both FM and AM. Unlike most other receivers and tuners, the Model 710 tunes in 25 kHz increments which makes for precise tuning on crowded FM bands.
Specifications
Power Amp Section
Continuous Average Power Output:  20 W (13 dBW) into 8 Ω
Rated Distortion:  0,05% (T.H.D. 20 Hz - 20 kHz)
Clipping Power: 25 W (max.contiuous power per channel)
IHF Dynamic Headroom:  3 dB at 8 Ω
IHF Dynamic Power:  80 W at 2 Ω;  60 W at 4 Ω; 40 W at  8 Ω
Damping Factor:  less 100
Input  Sensitivity/Impedance:  210 mV/20 k Ω / 220 pF
Maximum Input Signal:  less 10 V
Signal-to-Noise Ratio:  93 dB ( 1 W A weighted)
Frequency Response:  20 Hz - 20 kHz  ±0,5 dB
FM Tuner Section
Usable Sensitivity:  1,5 µV
50 dB Quieting
Mono :  2,5 µV
Stereo :  30,0 µV
Capture Ratio:  4,5 dB (45 dBf)
Selectivity Alternate Channel:  78 dB
Total Harmonic Distortion
Stereo :  1 kHz
Mono :  1 kHz 50 % mod 0,2%
Signal-to-Noise Ratio:  70 dB
Am Tuner Section
Usable Sensitivity:  7 µV
Signal-to-Noise Ratio:  45 dB
Physical Section
Dimensions (W x H x D):  435 x 91 x 273 mm
Weight (net/shipping):  6 kg / 7,1 kg
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