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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





Showing posts with label NORESCO. Show all posts
Showing posts with label NORESCO. Show all posts

Noresco System 85524

Our equipment speaks for itself

Noresco a Canadian Company founded nearly seven decades ago. Our business is to make quality quadraphonic and stereo components. And we think we make the best in the business. We say this because of the rigid quality control Noresco components have to pass to get our stamp of approval.

We built our own research and testing facilities in which a team of dedicated engineers create quality products for today's discriminating consumer. We determine beyond a doubt that Noresco equipment will reproduce the truest, richest sound possible. We do all this because when people say :Noresco" we want to hear them say the word "Quality" that's why you'll find our name in the finest stores and in the highest quality audio shops right across Canada.

Quadraphonic High Fidelity from Noresco

Previously, if you wanted to have the exotic feeling of being surrounded by music, a concert hall would be the place to go. Here the sounds come off the stage and reverberate off walls, ceiling and floor and by the time you hear the music it is all beautifully blended.

A good concert hall imparts fullness of tone. You will also have a feeling of intimacy with the orchestra. Reproducing this moving experience of a live performance is what 4-channel sound is all about. It's an even more spectacular improvement on stereo, than stereo was on mono.

As the term "4-channel" suggests, you use four speakers instead of two - two at the front and two at the back. Which adds front-to-back dimensions to the conventional side-to-side sound of stereo. But don't get the idea that you can get 4-channel sound by adding two speakers to an existing stereo setup. The only way to get true 4-channel sound is to buy yourself an amplifier with a built-in decoding system, which distributes the appropriate sound into four different speakers.

A good turntable is a must in a quadraphonic High Fidelity system

With Quadraphonic High Fidelity, precise tonearm tracking is as important as the orchestra being in perfect tune. This is where Noresco Quadraphonic system excel. Because they are built around the very finest turntable you can buy - Dual. But even Dual won't give you concert hall performance without precisely matched components. What we offer you is a perfect harmony. Dual automatic turntables. And the best Noresco tuners, receivers and speakers we have ever made. They.ve been designed and tested under the most modern scientific conditions.

 

This smart new system should win your heart and ears because of the outstanding features and the little price tag.

The 40 watt NRC3-855 Quadrasound receiver-turntable gives you an extremely fine sound of AM/FM programs or recordings. Then there's the remarkable Dual 1214 automatic turntable with dynamically balanced tonearm for precise tracking plus a Shure M75MD magnetic cartridge. The NEC-524 speakers are built with the same reproduction accuracy as Noresco's best Genuine Walnut finish.


 

Noresco 5670 loudspeakes

Acoustic suspension speaker system

The Noresco Acoustic Suspension Loudspeaker System 5670 incorporates a 10" woofer with a very low free air resonant frequency and extremely soft suspension to reproduce the lowest bass frequencies with minimum distortion. To ensure the high fidelity reproduction of the upper mid-range and high frequencies, a 1" dome tweeter is utilized.

The effective range of the woofer extends beyond 3,500 Hz allowing the Loudness Contour crossover to have a crossover frequency of 2,500 Hz and prevent the tweeter from being overloaded at frequencies below 2,500 Hz. System resonance is at 55 Hz

The overall frequency response of the complete speaker system is 40 to 20,000 Hz ±5 dB measured in our anechoic chamber. The frequency response will of course be affected by the room in which the speakers are to be used, consequently their location in the room becomes important. There is no hard and fast rule governing the location of speakers in a room, so the ultimate can only be achieved by experiment. The maximum power handling capacity of the model 5670 is 50 watts

 

Specifications

Frequency Response:  40 - 20,000 Hz

Crossover Frequency:  2,500 Hz

Drivers

LF :  10" woofer

HF :  1" tweeter

Max. Power Handling:  50 watts

Impedance:  8 Ω

Controls:  treble switch -3,0 dB / 0 dB / +3 dB


 

Noresco 2370 receiver

The 2370 is the first of a whole new generation of state-of-the-art. Receivers from Noresco. This receiver we believe to be the answer, too the audio enthusiast's tireless search for an "everything" Stereo and Quad Receiver.

The heart of this receiver uses an NF Direct Coupled low-distortion circuitry design in the equalizer amps. The result of this Negative Feedback (NF) principle is vastly superior performance through the entire frequency range to match RIAA playback characteristics. The Power Amplifier achieves its low-distortion properties through the use of low-noise silicon transistors in Semi-complimentary SEPP output circuitry.

Ahead of this clean powerful amp design, is the all-in 4-channel program circuitry. The 2370 is master of all 4-Channel systems. Discrete with built-in CD-4 demodulator, and SQ Matrix decoder. The Matrix circuit will also provide a startling enhancement of 2 channel stereo program material. The circuit recoveres ambience "information" and out-of-phase sound components lost on normal stereo playback and rechannels them to the rear channel amplifiers to yield a life-like "surround sound".

To provide the optimum performance characteristics from Discrete CD-4 discs there is a CD-4 Carrier Level Control and separate controls for left and right "wall" CD-4 separation. A test record with complete instructions is included with each unit. On the mode selector switch is another rather unique function for households with divers musical tastes. It's a 2 x stereo function, providing independent stereo program performance. For example, a pair of speakers in th eliving room could be tuned to a favourite FM stereo broadcast, while 8 track or stereo discs are playing in the recreation room.

The FM Tuner Section is geared for superlative performance, FET Front End and Ceramic Filter IF stage contribute to excellent sensitivity (2,5 µV). Coupled with this excellent selectivity is a new wider. Linear FM dial scale. Tuning is a cinch. Further aids are big, clean, tuning meters for signal strength and centre-of-channel FM stereo. A new, smooth flywhell action and larger tuning knob must be operated to fully appreciate how easy and precise tuning can now be.

The features detailed fully on the reverse, provide all the facility in a receiver you could want. Tape-to-tape dubbing, Tape/Source Monitoring, Loudness Contour Control, headphone jack positions for 2 Stereo program sources, or 4 Channel Headphones, Front and Rear Remotr Speaker switches, Split Front/Rear Treble and Bass Controls, plus independent Channel Balance Controls. This makes possible proper compensation for speaker positioning and varying acoustics in the listening area. Operating modes are discretely illuminated below the dial scale.

Truly, the 2370 is a multi-program, multi-talented performer to provide dependable service and satisfaction for many years to come. A pround addition to the Noresco line and just the beginning of great things to come in the Concept 2000 series.

 


Specifications

FM Tuner Section

Frequency Range:  88 - 108 MHz

Sensitivity:  2,5 µV ( 30 dB Signal-to-Noise ratio)

Selectivity (IHF):  >35 dB

Total Harmonic Distortion:  <1%

Signal-to-Noise Ratio:  >65 dB

Capture Ratio:  3 dB

IF Rejection:  >70 dB

Spurious Response Rejection:  >70 dB

Image Rejection:  >55 dB

AM Suppression:  >54 dB

Stereo Separation at 1khz:  >35 dB

Subcarrier Suppression:  >70 dB

Antenna Input:  300 Ω  (balanced) 75 Ω  (unbalanced)

AM Tuner Section

Frequency Range:  535 to 1625 kHz

Sensitivity:  20 µV (20 dB S/N, AM Ant. Term.)

Selctivity:  >25 dB (±10 kHz)

Image Rejection:  >50 dB

IF Rejection:  >45 dB

Audio Section

Power Output RMS at 8 Ω  (all Channel Drivenat 1 kHz, max. T.H.D. <1%):  2 x 24 W (4 x 12 W)

Power Output RMS at 8 Ω  (all Channel Drivenat):  2 x 22 W (4 x 11 W)

Frequency Response;  10 - 50,000 Hz (-3 dB)

Over Stated Frequency Range (at max. T.H.D. <1%):  50 - 20 ,000 Hz

Damping Factor:  30

Tone Controls Range:

Bass:  ±12 dB at 50 Hz

Terble:  ±12 dB at 10 kHz

Output Impedance:  8 Ω

Recording Output:  800 mV

Loudness Contour:  +7 dB

Hum And Noise (IHF):  75 dB

Input Sensitivity/Impedance:

Aux:  180 mV/30 k Ω

Tape:  180 mV/30 k Ω

Mag Phono :  1 - 10 mV/80 k Ω 

Semiconductors:  7 FET; 3 Ics: 76 Transitors; 37 Diodes; 4 Stabistors; 2 Dual Rectifiers; 1 Varactor

Dimensions (W x H x D):  21-1/2" x 5-1/2" x 14-1/4"

Weight:  22 lbs