So taking any power differences to the LED's out of the equation all we have left is noise difference of battery v mains. But if anyone can hear the difference between 6uV and 4uV they must be superman. I have measured this my Tektronix scope which has very good low resolution.
When the shorted input Lightspeed was powered by the battery I measured a noise floor of close to 4uV (that's microvolts not millivolts) When it was powered by the mains it was then 6uV. These are exceptional figures as most things in audio are measured in mV (millivolts) which is 1000 x higher than microvolts. And so it should be this quiet as it is passive and has no noise of it's own.
But if this is perceived difference some hear (as I also hear) between battery v mains comes down to those miniscule noise differences then the book has to be re-written.
Cheers George
When the shorted input Lightspeed was powered by the battery I measured a noise floor of close to 4uV (that's microvolts not millivolts) When it was powered by the mains it was then 6uV. These are exceptional figures as most things in audio are measured in mV (millivolts) which is 1000 x higher than microvolts. And so it should be this quiet as it is passive and has no noise of it's own.
But if this is perceived difference some hear (as I also hear) between battery v mains comes down to those miniscule noise differences then the book has to be re-written.
Cheers George