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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





Pioneer PL-112D

 Precision Belt-Drive with 4-pole Synchronous Motor
Stable rotation of the 30 cm die-cast aluminum alloy platter is maintained by the carefully engineered 4-pole synchronous motor and belt drive system. The smooth running of the motor is unaffected by fluctuations in line voltage and load, while even the slightest vibrations from the motor are absorbed by the polyurethane belt. High performance is exemplified by the 0,07% (WRMS) wow and flutter, and 63 dB (DIN-B) signal to noise ratio.
 High Sensitivity S-Shaped Tonearm
The tonearm gimbal incorporates high precision angular contacct bearings, whose low vibration and friction ensure high sensitivity together with long term reliability. Antiskating and lateral balance controls are included for optimum performance with high compliance cartridges and light tracking forces, and the direct readout of the tracking force is especially convenient when replacing the cartridge.
 Numerous Additional Features
A host of additional features enhance the convenience and performance of the PL-112D. Among these are a lightweight, high rigidity aluminum headshell, low capacitance output cord, free-stop dust cover hinges that allow easy installation and removal, and an oil-damped tonearm elevation mechanism toprotect valuable records and stylus. The interior of the cabinet is lined with aluminum foil to scren out external electrical noise which is often picked up from other household appliances, while motor and external vibrations are also isolated by the vibration-absorbing spring suspension design.

Sophisticated Cabinet Styling
The baseplate is made from mineral soild, a new high density material which combines excellent acoustic absorption properties to prevent resonance with high strength and attractive finish. In addition the elegant wood grain finish of the cabinet ideally matches the high quality engineering of the PL-112D.
Specifications
Motor and Turntable
Motor:  4-pole synchronous motor
Drive System:  belt-drive
Speeds:  33-1/3 and 45 rpm
Wow and Flutter:  0,07% (WRMS) or less
Signal-to-Noise Ratio:  63 dB (DIN-B) or more
Turntable Platter:  Aluminum alloy die-cast
Diameter:  300 mm (12”)
Moment of Inertia:  135 kg-cm² (including rubber mat)
Tonearm
Type:  Static-balance type S-shaped pipe-arm
Effective Arm Lenght:  221 mm (8-11/16”)
Tracking Error:  +3° to -1°
Overhang:  15,5 mm (5/8”)
Usable Cartridge Weight:  4 g to 10 g
Additional Features:
Anti-skating force control;
Plug-in type headshell;
Oil-damped arm elevator;
Free-adjustable hinges;
Lateral balancer.
Power Requirements: 120 V to 240 V, 50/60 Hz
Power Consumption: 10 watts
Dimensions (w x H x D): 440 x 159 x 362 mm (17-5/16” x 6-1/4” x 14-1/4”)
Weight: 6 kg (13 lb 2 oz) net