Due to the arrival of my WM1AM2 I'm selling my heavily upgraded Sony NW-WM1a with clear case , modified by NPAudio. The unit is in very good condition with a couple of small scratches at the bottom .
To my own disbelief I no longer have the original box but I'll make sure it's well protected for shipping .
Only IEM I'm looking for in a trade + cash : Penon 10th AE
Please contact me for shipping cost to your destination or further information .

Details of the modifications are as follows:
Double thickness copper shielding / grounding over the amplifier section. (Stock WM1A/Z is plastic)
3.5mm Single Ended cables upgraded with Neotech Flat 7N OCC copper cable.
Neotech Flat 7N OCC copper to a new Pentaconn 4.4mm
20 AWG 7N OCC Solid Copper (ground return)
Both 3.5mm and 4.4mm outputs powered directly from the inductors
Relay removal, bypass and *board precision cut to allow for larger caps
Single Ended caps upgraded to Audio Note Standard
*Larger balanced out Audio Notes bicapped with Kemet KO caps.
Twin Supercharged! An additional SuperCap installed
The very best Audio Note Kaisei and Audio Note Standard caps (16 Caps replaced + 4 Kemet KO) The main power cap is 10 times the physical size of the stock cap, *balanced out caps are 12 times larger and the others 3 to 4 times.
SS47 Solder (Contains 4.7% Silver)
Custom Laser cut copper full back plate for better shielding and grounding.
Internal - Relocation of Bluetooth Antenna
4000 mah Battery (over double the stock 1860mah Battery)
As you’ll probably be aware, various different sound signatures are available via the internet from MrWalkman and other dedicated audiophiles. Currently I have the MrWalkman Warm sound signature loaded which gives great body and excellent detail retrieval. From a smoke free home.