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DD ddHiFi DJ44S M1 Ground Pin Adapter for Sony NW-WM1A and NW-WM1Z

4.4mm plug

Product SKU: DJ44S M1 Black


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Product Details

(Specifications and appearance of this product are subject to change without notice)
↓ Details provided by DD ddHiFi

All-in-one design with exclusivity

DJ44S M1 is designed exclusively for SONY NW-WM1A and NW-WM1Z.

Retaining the signature tuning

The DJ44S use the OCC copper cable for connectivity and lead-free gold for soldering*.

*MUNDORF Sn 88.6%, Cu 1.8%, Ag: 9.5%, Au 0.1%.

Why is SONY DAPs' 4.4mm jack not connected to the ground?

The conventional balanced headphone cable has only four connection points, namely R+, R-, L+ and L-. However, it does not feature the use of the Ground point on the 4.4 mm plug. On the other hand, if the 4.4mm headphone jack was grounded, there might be impacting feedback when plugging and unplugging. Perhaps, for this reason, the SONY DAPs' 4.4mm jack is not connected to the ground.

Why does the sound quality improve after being grounded?

There is a precondition that the 4.4 mm headphone cable used must be shielded and properly grounded. The chassis of Sony players, particularly the NW-WM1Z and NW-WM1ZM2, is made of oxygen-free copper gold-plated material with high purity and strong electrical conductivity that can provide a good grounding for the cables with shielding. When a 4.4 mm headphone with shielding is plugged into, the shielding layer of the cable is then grounded to the player's chassis. As a result, it can better prevent the influence of external electrostatic or electromagnetic induction.

Integrated grounding design promotes reliability and safety

The chassis of the SONY players are connected to the ground of the 3.5mm jack. The ground pin of the DJ44S is much shorter than the 3.5mm headphone plug, which ensures normal grounding and prevents damage to the jack due to unbalanced force*.

*Unbalanced force means the pressure point can be overly biased toward one side when inserting or pulling the adapter at an inclined angle. Since the 3.5 mm headphone jack uses a plastic chassis, this is very likely to damage the jack.


DJ44S M1 Black Gold
Shell 6063 Aluminium Alloy (black) 6063 Aluminium Alloy (gold)
Internal Cable 25.5 AWG 6N OCC 25.5 AWG 6N OCC
Ground Pin Copper plated with 24K gold Copper plated with 24K gold (thicker)
4.4 Socket ddHifi Pentaconn
Soldering Tin Sn 96.5%, Cu 0.5%, Ag 3.0% Sn 88.6%, Cu 1.8%, Ag 9.5%, Au 0.1%
Weight (excl. the plug) 34g 35g
Dimensions 69.5 x 17 x 20 (mm) 69.5 x 17 x 20 (mm)

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