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





Onkyo Integra T-9090 II

 Onkyo Integra T-9090 II Computer-Controlled FM Tuner

The Integra Series Sound
Onkyos Integra series of hi-fi components is dedicated to a simple yet elusive goal; the accurate recreation of the full sonic impact of a live performance with all its immediacy and excitement.
The T-9090II epitomizes this dedication. A worthy addition to integra line, this FM-only tuner sets a new world standard in FM reception and operating convenience. Nothing less would be enough; nothing less would be Integra.

Computer-Controlled Five-Mode APR (Automatic Precision Reception) System
The five-mode APR system in the T-9090II monitors the quality of the FM broadcast being received and automatically sets a total of five reception modes (antenna [A/B], RF mode [DX/local], IF bandwidth [wide/narrow/S-narrow], hi-blend [on/off] and mode [stereo/mono]. APR provides optimum FM quality with computer controlled accuracy and convenience. All modes can be changed either manually or by remote control if necessary. You can even preset them in memory.
 High Sensitivity and Selectivity
The T9090IIs reception of weak FM stations, whether over the air or cable, is outstanding; 50 dB quieting sensitivity is a remarkable 0,8 µV. Selectivity has also been substantially improved over the previous version, for clear reception of weak stations even if powerful local channels broadcast on adjacent frequencies. The selectivity specification of 80 dB, adjacent channel, ±300 kHz sets a new standard in FM tuner performance.

SFR (Sonic Noise Filtering Reception) Anti-Microphonic Circuit
Though known for their low distortion. Synthesizer tuners are extremely sensitive to mechanical vibrations. If sound pressure from the speakers causes the chassis to vibrate, these vibrations can in turn be translated into distortion-causing electrical voltages. If these spurious elements find their way into the music signal; the tuner will sound distorted and unmusical. This phenomenon is known as the microphonic effect. Onkyo’s SFR system uses electrical means to fight microphonic interference at its source; the synthesizer section. This innovative technology greatly contributes to the astonishing sonic purity and naturalness of the T-9090II.
 Top Quality Construction
Onkyos unwillingness to compromise on quality is no where more evident than in the solid construction of the T-9090II. This tuner is built to last, from the copper front end shielded case, pure copper bus ground lines (five in all) to the shielded casings for the digital and power supply blocks. In addition, the chassis of the T-9090II is specially designed to prevent microphony, incorporating a damping steel base panel to keep mechanical vibrations to a minimum.

Other Features:
Automatic or manual antenna selection (A or B)
Cable FM compatibility with 25 kHz tuning steps and cable FM fine tuning mode
Multi-function digital display
Designed for sonic excellence with strictly selected electrical components
20-stations memory
Preset memory scan previews all preset stations by tuning in each one for five seconds
Adjustable output level
31-key remote control included
Auto scan memorization puts strong frequencies in memory automatically
Power supply filter
Timer program preset tuning
Wood grain side panels included
Specifications
Tuning Range:  87,5 – 108,0 MHz
Tuning Steps:
Manual mode : 25 kHz step
Auto mode :  50 kHz steps
Usable Sensitivity:
Mono :  0,8 µV (S/N 26 dB, 40 kHz DE.) DIN
Stereo :  20,0 µV (S/N 46 dB, 40 kHz Dev.)DIN
50 dB Quieting Sensitivity:
Mono :  15,8 dBf (1,7 µV)
Stereo :  37,2 dBf (20 µV)
Capture Ratio:  1,0 dB
Image Rejection Ratio:  100 dB
IF Rejection Ratio:  100 dB
Signal-to-Noise Ratio:
Mono :  95 dB (IHF)
Stereo :  85 dB (IHF)
Selectivity:  80 dB (+-300 khz IF: super narrow)
AM Suppression Ratio:  60 dB
Total Harmonic Dostortion:
Mono :  0,009% (IF wide)
Stereo :  0,02% (IF wide)
Frequency Response:  30 – 15,000 Hz (+0,5 dB -1,0 dB)
Stereo Separation:
55 dB at 1 kHz  (IF wide)
33 dB at 70 10,000 Hz (IF wide)
Output Voltage:  0 – 1,5 V
Dimensions ( W x H x D):  465 x 103 x 387 mm (18-5/16” x 4-1/16” x 15-1/4”)
Weight:  8,5 kg (18,7 lbs)


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