Denon Direct Drive Catalog

Page 2

The Philosophy behind DENONs Turntable Designs

To function as an essential part of a true high fidelity reproduction system. a turntable must maintain sufficiently
stable rotational performance in spite of load changes taking place during the course of play.

To accomplish this. DENONs turntables use as the drive motor. the core of the rotation system. a highly sophisticated
AC servo motor.

This servo motor is virtually free from "cogging" and thus delivers a high signal-to-noise ratio in addition to its highly
precise rotation.

The performance oi any servo motor depends greatly upon the speed and precision of its detection system. DENON's
highly responsive servo motor is actually a magnetic record detecting system in which a magnetic head (much like
that found on tape decks) is used to detect 1000 pulse signals which have been precisely recorded on the inner cir-
cumference of the turntable platter. The combination of this system with DENON's Quartz Speed Control offers ex-
tremely low wow and flutter even in the presence of warped records and large variable loads.

To determine the ever decreasing amounts of wow and flutter. DENON developed a unique Pulse Wheel Measurement
technique. With this method. even small residual amounts of wow and flutter can be measured. so that further im-
provement of the performance of DENON DP Series turntables can be accomplished. All DENON turntable mats have
been improved to prevent the disc from vibrating. Recent developments in recording technology. namely those in
direct cutting and pressing, have made the appearance of high quality recording widespread.

DENON. alter thoroughly researching the problem of tracing performance. has developed the electronic dynamic
servo tracer tonearm design. working together with an extremely stiff and light straight tonearm. dramatic improve-
ments in saund quality.

DENON is proud to introduce its unique "non-resonance concept" design.

DENONs Innovations in High Performance Turntable Design
DENON's Dynamic Servo Tracer Turntable

Generally speaking. the occurrence of low frequency resonance in
tonearm assemblies is inevitable. The point of this resonance is
usually determined in conventional systems. as a function of both
the compliance of the cartridge and the effective mass ol the
tonearm.

These bad effects from low frequency resonance are minimized by
the adoption of electronic tonearm damping in both the horizontal
and vertical, planes.

The Dynamic Servo Tracer Tonearm has been adopted to fully ex-
ploit the advantages of lightweight tonearm for improved iracung
periormance and dramatic decrease in intermodulation distortion.
resulting in sharp. clear sound reproduction.

DENON's Magnetic Record Detection System

DENON's magnetic recording detection system employs a magnetic head to detect 1.000 pulse
signals which have been precisely recorded on the inner circumference of the turntable platter
(inside its rim). It is at this point that changes in rotational speed of the turntable are easiest to
check, unlike conventional FG servo systems which employ a frequency generator (FG) directly
connected to a motor for detection.

Its accuracy is more than 10 times higher than that ol other systems. accounting for its excellent
responsiveness and speed. Coupled with DENON's quartz lock (phase control based on quartz
oscillation). the absolute highest level of rotational accuracy is achieved.

Fully-Automatic Completely Non-contact Electronically Controlled Tonearm L" 2 . ,, I
DENON firmly believes that fully-automatic operation should offer increased ease-ol-use without \ " g'
sacrificing intrinsic performance. Strictly adhering to the principle of non-contact design. s 7/
DENON engineers developed a fully-automatic electronically controlled tonearm. This non- G _.
contact electronically controlled servo tonearm is driven by a MC (moving coil) tape angular con- .7. v, "

. l

trol motor. 1 ." l '

Auto-lift Mechanism with Non-contact End-of-Play Sensor

DENON's auto-lift mechanism uses a non-contact optical detection system to sense the end of l
the record. This applies no load on the tonearm and thus has no influence on tonal quality. (The
tonearm moves freely by hand.)