That was the original thought for me, but I can also power the miniDSP that way so, other than the bluray player which can be moved I will only need mains leads for the power amps.
It's not universal, but if the other option is to go medieval on the mains with half a ton of iron I'll go batteries because I can.
It's not universal, but if the other option is to go medieval on the mains with half a ton of iron I'll go batteries because I can.
Current discussion is about quality of DC supplies and has also recently been about AC supply filtering....both are are intertwined subjects IME.
I have run USB isolator/5V power injection pcb using a Lead/Acid car battery as supply that should have essentially zero impedance and essentially zero noise according to accepted criterion (on board down regulated to +5V), HOWEVER I found that RLC filtering of this Lead/Acid DC supply made sonic difference compared to using other battery chemistries of not the same but more than ample current capability for the application with the same RLC filtering.......I am saying that somehow different batteries sound different despite the same filtering and DC regulation on the same USB isolator/DC injector pcb.
Dan.
I have run USB isolator/5V power injection pcb using a Lead/Acid car battery as supply that should have essentially zero impedance and essentially zero noise according to accepted criterion (on board down regulated to +5V), HOWEVER I found that RLC filtering of this Lead/Acid DC supply made sonic difference compared to using other battery chemistries of not the same but more than ample current capability for the application with the same RLC filtering.......I am saying that somehow different batteries sound different despite the same filtering and DC regulation on the same USB isolator/DC injector pcb.
Dan.
Of course. Lead batteries are using lead electrons (heavy) while lithium batteries use lithium electrons (much lighter). Lithium electrons can easily sneak through RLC filters and regulators, while the lead electrons are too heavy to get through, hence the lead batteries appear as having much less excess noise modulated properties.
This all sounds a bit glass hammer and a bucket of steam - you having a larf?
No, I have a random audiophile phrase generator that I enjoy powering up from time to time and post bits and pieces of wisdom from the output stream. Unfortunately it cannot compete with Dan, Bybee, Geoff Kait, and Stereophile reviewers generators, but I'm working at version 2.0
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BTW above measurements are valid only for Li-Ion without built-in electronic fuse
and say nothing about Li-IronPhosphate or other chemistries.
These cells are dangerous without fuses. They can easily melt wires, as it happened
to me on a follow-up measurement. 20A is easy for them.
I wondered about a rise in noise above 600 KHz, suspected the input cap and removed it,
but it was not the cap. It was the single U-shaped layout connection from the coupling cap
to the 20 op amp inputs. Skin effect.
Changing that to the mesh whose remains can be seen in the photo changed that.
Unfortunately I forgot about the missing capacitor until the next weekend.
Oh, that smell!
And the amplifier was in a nearly watertight Hammond metal box with 6 screws.
Be careful with these batteries.
and say nothing about Li-IronPhosphate or other chemistries.
These cells are dangerous without fuses. They can easily melt wires, as it happened
to me on a follow-up measurement. 20A is easy for them.
I wondered about a rise in noise above 600 KHz, suspected the input cap and removed it,
but it was not the cap. It was the single U-shaped layout connection from the coupling cap
to the 20 op amp inputs. Skin effect.
Changing that to the mesh whose remains can be seen in the photo changed that.
Unfortunately I forgot about the missing capacitor until the next weekend.
Oh, that smell!
And the amplifier was in a nearly watertight Hammond metal box with 6 screws.Be careful with these batteries.
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Batteries are usually a good solution, but hard to keep charged. AND the best audio products require too much current and voltage to be easily battery powered. However, making a good AC powered supply is a real challenge. Not because of regulation, or even noise necessarily, but subtle problems from leakage, feedback overshoot, etc.
I blew it off this year, though two of my compatriots are there having fun...
Enjoy yourself Ed!
Howie
As we have discussed about it quite often in the past, let´s just keep in mind that the socalled replication crisis exists quite a long time and that Cohen mentioned that problem of underpowered studies the first time in the 1960s while already emphasizing that he only reinvented an old idea.
So despite the need for hard end points it seems that the "hard results" are often just an illusion.
The notion that the knowledge about a device creates an overwhelming, uncontrollable bias-effect in a listening test while all other bias-effects, that are still at work under controlled (and "blind") conditions, are controllable isn't that well corrobated by experimental results.
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