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





Technics SA-404 receiver

With all the receivers to choose from,how do you make the right choice? By comparing power, performance and price. It's the only meaningful way to tell how much receiver you're getting for your money.
So compare.
As you can see, Technics gives you a lot. A lot of power and a lot of performance at a avery good price. That's because our receivers have the technology you need. Like hefty transformers and big power capacitors to punch out deep bass notes with authority. Like a dynamic headroom of 1,4 dB which means 38% extra power (above RMS) on sudden musical transients.
Our phono sections are just a s impressive. All have a very high Signal-to-Noise Ratio, which means that even quiet musical passages come through clearly.
Yet each can handle the high voltages generated by today's best records.
And when it comes to FM, all Technics rceivers include MOS FET's for high sensitivity and low noise. "Flat Group Delay" IF stages for clean signal processing. And phase-locked-loop circuitry for accurate stereo imagimg.
With the SA-404 and SA-505, you also get 10 LED peak-power indicators. And Acoustic Control that gives you more control over both the bass and treble frequencies than is possible with conventional tone controls.
Specifications
Amplifier Section
Rated Power Output (minimum sine wave RMS):  50 W per channel into 8 Ω (20 Hz - 20 kHz both ch. Driven, 0,04% T.H.D.)
1 kHz Continuous Power Output (both ch. Driven 0,04% T.H.D.):
55 W per channel into 8 Ω
60 W per channel into 4 Ω
Dynamic Headroom:  1,4 dB 98 Ω)
Total Harmonic Distortion
Rated Power at 20 Hz - 20 kHz :  0,04% (8 Ω)
Half Power at 20 Hz - 20 kHz :  0,02% (8 Ω)
Hale power at 1 kHz :  0,009% (8 Ω)
SMPTE Intermodulation Distortion:  0,04% (8 Ω)
Frequency Response:
Phono :  RIAA standard curve +0,3 dB
Tuner, Aux, Tape :  7 Hz - 45 kHz -1 dB (20 Hz - 20 kHz ±0,2 dB)
Input Sensitivity:
Phono :  0,4 mV (2,5 mV, IHF'66)
Tape 1, 2 :  20 mV (150 mV, IHF'66)
Signal-to-Noise Ratio (IHF, A)
Phono :  73 dB (80 dB, IHF'66)
Tuner, Aux, Tape :  78 dB (95 dB, IHF'66)
Maximumm Input Voltage:
Phono :  120 mV (150 mV, 1 kHz)
Input Impedance
Phono :  47 k Ω
Tape 1, 2 :  27 k Ω
Tone Controls
Bass :  ±10 dB at 50 Hz
Treble ;  ±10 dB at 20 kHz
Acoustic Controls (at tone "0" position):
Low Boost :  100 Hz, +6 dB
High Boost :  10 kHz, +6 dB
Low Filter:  100 Hz, -6 dB/oct
High Filter :  7 kHz, -6 dB/oct
Loudness Control (volume at -30 dB):  50 Hz, +9 dB
Output Voltage
Rec Out :  150 mV
Low Frequency Damping Factor:  34 at 8 Ω; 17 at 4 Ω
Load Impedance
Main or Remote:  4- 16 Ω
Main and Remote :  8 - 16 Ω
FM Tuner Section
Frequency Range:  88 - 108 MHz
Sensitivity:  10,8 dBf (1,9 µV, IHF'58)
50 dB Quieting Sensitivity
Mono :  13,7 dBf (2,7 µV, IHF-58)
Stereo :  37,2 dBf (39,7 µV, IHF'58)
Total Harmonic Distortion
100 Hz :  0,15% (mono ); 0,3% (stereo)
1 kHz :  0,15% (mono): 0,3% (stereo)
6 kHz ;  0,3% (mono); 0,4% (stereo)
Signal-to-Noise ratio
Mono :  75 dB
Stereo :  70 dB
Frequency Response:  20 Hz - 15 kHz +1 dB, -2 dB
Alternate Channel Selectivity:  70 dB
Capture Ratio:  1,2 dB
Image Rejection (98 MHz):  60 dB
IF Rejection (98 MHz):  75 dB
Spurious Response Rejection (98 MHz):  82 dB
AM Suppression:  55 dB
Stereo Separation:
At 1 kHz :  45 dB
At 10 kHz :  35 dB
Carrier leak:
At 19 kHz :  -40 dB
At 38 kHz ;  -50 dB
Antenna Terminals :  300 Ω (balanced), 75 Ω (unbalanced)
AM Tuner Section
Frequency Range:  525 - 1605 kHz
Sensitvity:  30 µV, 300 µV/m
Selectivity:  30 dB
Image Rejection (1000 kHz):  50 dB
IF Rejection (1000 kHz):  40 dB
General
Power Supply/Consumption:  AC 120 V, 60 Hz  / 300 W, 345 VA
Dimensions (W x H x D):  480 x 160 x 293 mm (18-29/32" x 6-5/16" x 11-17/32")
Weight:  8,4 kg (18,5 lbs)

Nessun commento:

Posta un commento