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





Marantz PM-8 amplifier


Stereo Control Console
Features Preamplifier Section:
Transient Intermodulation Distortion (TIM) design and controll versatility. Like the SM-7 and SC-7, features design parts specifically created to combat transient intermodulation distortion.
Low Noise and Low Distortion phono Equalizer
The Input is a cascade defferential formed of low-nooise FET's, followed by a complete push-pull amp and Darlington-connected SEPP output. The entire phono equalizer circuit in PM-8 is DC for low distortion, low-TIM performance and better transient response.
Pre-preamp for MC cartridges, the built-in pre-amp is DC using low noise Fets at the input. S/N ratio is extremely good thanks to low-impedance negative feedback circuitry.

Features Power Section
Powerful low-TIM performance. Marantz use DC configurationthrought and improved every circuit part for combat Transient Intermodulation Distortion, TIM
Marantz use high speed power transistors created to our specifications and still more important, and improved open-loop response to enable us to use a lower amount of negative feedback thereby reducing the more ordinary forms of distortion.
Low Noise and High Output configuration. The input of the Pm-8 is formed of a differential Dual FET with matched thermal characteristics. Next is a duall FET differential  amp. An emitter/follower buffer and a 3 stage darlington-connected output, ending in a parallel push-pull circuit. This latter circuit is formed of an array of EBTs (Emitter - Ballast - Transistor) with superb performance characteristics, both in high power output and high speed switching.
Separate power Supplies, Left ann Right channels receive power from separate supplies. The predriver and power output sections each have their own transformer. To further assure a constant energy supply a quartet of massive 15,000 µF capacitors are used.

Specifications:
Power Output (rating per channel)
320 W at 4 Ω DIN
270 W at 4 Ω RMS
200 W at 8 Ω DIN
190 W at 8 Ω RMS
Total Harmonic Distortion (RMS, 8 Ω):  0,03%
Intermodulation Distortion:  0,03%
Dampingg Factor:  100
Main In Sensitivity/Impedance:  1,5 V/30  k Ω
Frequency Response:  DC 100 Hz-kHz
Signal-to-Noise Ratio Main In:  125 dB
MM Cartridge Input
Frequency Response (RIAA):  ±0,2 dB
Signal-to-Noise Ratio:  90 dB
Input Impedance:  1/100/27/47 k Ω
Input Capacity:  200 pf
Input Sensitivity:  2 mV
Equivalent Noise at Input:  0,24 µV
Dynamic Range:  125 dB
Moving Coil Cartridge Input
Input Sensitivity/Impedance:  200 µV/ 10/47/100/220 Ω
Aux. Input Sensitivity/Impedance:   150 mV/40 k Ω
Frequency Response:  5 Hz -100 kHz
Signal-to-Noise Ratio:  105 dB
Output Voltage:
Tape Out ;  415 mV
Preamp Out :  1,5 V
Output Impedance
Tape Out :  250 Ω
Preamp Output :  100 Ω
 dimensions (W x H x D):  416 x 146 x 437 mm
Weight:  26 kg
Finish : Walnut Cabinet


1 commento:

  1. im looking for some good speakers for my home recording studio. i've been looking at the PARADIGM 7se MkII, but i need a speaker that can produce the correct bass frequencies when recording bass guitar, the behringer truth speakers that i'm using cant do it. right now i'm using a kenwood KA-3500 for an amp, but i want to eventually get something with a little more power. what are your prices and location, kijiji says ottawa. my email anthonyabaird@yahoo.ca

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