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

Pioneer SX-1050

FM Front End And FM IF Section
The quality of these two sections is decisive for sensitivity, enabling you to get stations whose signals are weak or weakended by distance or obstacles and for selectivity which rejects undesirable stations. This is why Pioneer uses field-effect transistors (FET and MOS-FET) for the first section and variable capacitors with a minimum of 3 gangs and up to 5 gangs. Multipath switch ensures accurate antenna mouting for optimum reception.
 Multiplex (MPX) Circuit
Its function is to separate the right and left channels from the stereo FM signal. This is a very complex operation and often influenced by temperature and air humidity. The phase lock loop integrated circuits (PLL) automatically control the stability of this separation.
Refined Design and Operation Features
The presentation of the Pioneer receivers SX-1050 is of a remarkable quality. Pioneer styling is also legendary, touch the button of a Pioneer and compare to others. Such production precision is almost incredible. Finally, it's the power and the variety of possibilities which will enable you to choose.

FM Muting
A built-in muting circuit effetively eliminates irritating pop and interstation noises during tuning and detuning on all Pioneer receivers.
 AM (Long and Medium Wave) Reception
AM reception is often a neglected point on many receivers, and the poor quality of the sound drivers you back to FM eben when you want to listen to an interesting program on AM. Not on a Pioneer, thanks to the use of LSI (Large Scale Integrated Circuits), ceramic filters,  and two or three gang capacitors.

Hign Class Equalizer And Control Preamplifier
The quality signal produced by the FM section must be as carefully treated as the signals from the turntable, the tape recorder, or the cassette deck.
For records the direct coupled 3 or 4 stage preamplifier equalizers give an RIAA correction always within ±0.3 dB, and input tolerances of 150 mV  to 500 mV assuring good rstitution of the high and low frequencies and a god dynamics range.
The control preamp using field effect transistors and integrated circuits (CR type) allows very delicate control. The SX-1050 have double effect and twin tone control system.

Power Supply and Protection Of Power Amplifier
The power of the Pioneer receivers is a real power, always indicated from 20 to 20,000 Hz with the corresponding maximum distortion. Direct coupled PNP, NPN circuits  and Darlington transistorized circuits, assure this succes. So that this power can be supplied, Pioneer chose oversize transformers and electrolytic capacitors to provide all the energy necessary for the lowest frequencies.

Specifications  SX-1050
Audio Section
Continuous power:
2 x 170 W  (both channel driven at 20 Hz - 20 kHz, 4Ω)
2 x 120 W  (both channel driven at 20 Hz - 20 KHz, 8Ω)
THD at rated output power  (DIN), 8Ω:  <0,1%
Power bandwidth (DIN) both channel driven 8Ω:  5 Hz - 40 kHz
Frequency response at AUX input (DIN):  10 Hz - 50 kHz (+0 dB, -1 dB)
Input sensitivity impedance:
Phono:  2,5 mV/50 kΩ
Microphone:  6,5 mV/50 kΩ
Tape monitor, Tuner, Aux:  150 mV/100 kΩ
Bass control (100 Hz):  ±10 dB
Treble control (10 kHz):  ±10 dB
FM Section (87,5 to 108 Hz)
Sensitivity (DIN):
Mono  (26 dB S/N ratio):  1,6 μV
Stereo (46 dB/S/N ratio):  35μV
Capture ratio: 1 dB
Selectivity (±400 kHz):  80 dB
S/N ratio (IHF):  78 dB
THD (stereo) 1kHz (DIN):  <0,25%
Frequency response (DIN):  30 Hz - 15 kHz (+0,2 dB, -2 dB)
Stereo separation 1 kHz (DIN):  45 dB
Subcarrier suppression:  73 dB
AM Section (525 - 1605 kHz)
Sensitivity (IHF):  15 μV/m
Selectivity:  40 dB
Dimensions (W x H x D):  526 x 173 x 454 mm
Weight:  23,4 kg

Nessun commento:

Posta un commento