WM-DD2DDII

Sony WM-DD2 feature
WML ID #20
Manufacturer
Sony
Model
WM-DD2
Nick
DDII
Series
DD
Year
1984
Made in
Japan
Initial price
279 DM
Technical details, specifications
Battery
2AA
Battery life
9 h
Colors
black red gray
Dimensions
79.7*110.*31.1 mm (273 cm³)3D size
Weight
290 gr
Window
yes
Frame
plastic
Case
metal
Carry
pouch
Expandable
no
External compartment
no
Drive
DiscDrive
Tape selector
Manual switch
Waterproof
no
Speaker
no
Frequency range
40-15000@4 Hz
FMax output
2x20 mW
Functions
DC in
yes
Record by input
no
Record by int mic
no
Hotline mode
yes
Cue
no
Balance (L/R)
no
Phone type
1
Equalizer
no
Auto volume no
Auto reverse
no
Anti rolling
yes
AMS no
Blank skip no
Logic control
no
Hold lock
no
Bass
no
Noise reduction
Dolby B NR
Radio
no
Remote control
no
Wireless headphone
no
Indicator
led
Description

DD2 had the addition of Dolby B noise reduction, and many minor improvements.

The WM-DD2 appeared to be a WM-DD but with the addition of Dolby B NR. In marketing terms this is exactly what it was, though technically the change was far from trivial. The innovation that made this change possible was the introduction of miniature Dolby ICs that could run directly from the 3V battery supply without the need for a DC-DC converter (as had had to be employed in the WM-7, for example).
Even with these devices the changes made between the WM-DD and the WM-DD2 were far reaching and only possible because the printed circuit board was made with track work on both sides.
All the user saw, however, was that important extra switch. Dolby NR and the disc drive capstan servo had transformed the compact WM-2 into a serious hi-fi device.
The next step in the evolution of the Walkman was to add quartz crystal lock and Dolby C for playback to the DD series. This appeared in the next model, the WM-DC2.Via Walkman Central (edited)

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Additional notes
W&F: 0.13% (DIN), 0.08% (WRMS)
Created
2021-07-10 18:46:34
Updated
2024-06-14 07:33:04
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