crate sound - headphone amplifier

The Crate Theatre sound is delivered through headphones, while I have been wanting to make myself a portable high fidelity headphone amplifier for some time, I needed to use parts available locally.

Enter the Duinotech 2 x 3W PAM8403 IC amplifier module, $5.00 locally...

There are many posts on the web stating that is not possible to common the output ground on the PAM8403 IC for use with 3 pole jack connectors, full H bridge output etc. I tried two options before finding a near working solution.

So, what DIDN'T work: