It was first tried with 1.5V (in fact 1.3V) and sounds brilliant with a very extended bandwidth.
The so beautiful Don't you Forget About Me - Simple Minds 80's song was on the portable Sony CD player.
The Sennheiser HD580 have just had their ear pads replaced by genuine parts and sound like new.
The HD580 were first connected directly to the Sony CD player. The sound was very nice.
Then through Pleiadss 2N3053 at 1.3V. Bandwidth ear-brain perception was extended. There was some euphonic harming perhaps enhancement. The sound was loud.
Then 2 AA 1.2V batteries were connected in series. The sound was louder and perhaps clearer. But in the end the 1.2V was prefered. At 2.6V it was starting getting too loud. Bias was not readjusted. It may have to be done to optimize for 2.6V operation.
With such conditions the 1.2V sound was relaxed, easy and big.
It has to be considered that as DC current increases since it passes through the headphones (no capacitor) the reasonant frequency of the headphones may change because of a change in tension.
As some grain was observed, so an older CD from Columbia was played too. Ray Conniff. It sounded brilliant.
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