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What are the effects of powering a 14 volt system with 12 volts?

I have some older, but nice yamaha computer speakers. there is an external transformer, and it says the out put is 14v dc, 800 mA. I am wanting to skip the transformer, and us a 12 volt sealed led acid battery battery to power them, placing it after the transformer. I would prefer to use the 12v battery as a 12v 5 ah battery is around 25-35 dollars, and a 14.4v 2ah battery is around 70 dollars.

Would this do any damage to the amplifier circuit within ? What effects would this have on the sound quality of the speakers? Would I be able to be switch from 12v dc, skipping the transformer, and plugged into the wall using the tranformer if i wired it to be able to do so, and would that have any long term effects on the speaker?

bwrussell5 years ago
You may lose a little volume but it shouldn't do any damage.
lemonie5 years ago
My Creative system runs on 12V.
I hacked the power-lead to run it from a car last year; both cars had ciggie-lighters that didn't work but I tested it and it runs fine. The normal power-supply says 13.5V, but what's 0.5V within margins of error / rounding?

L
I expect that your amplified speakers will run comfortably from a 12V lead-acid battery, for as long as the battery lasts.  To estimate that number you divide the capacity of the battery in ampere*hours by the actual amount of current that's being drawn.

I am guessing there might be slight improvement in sound quality when using a battery, due to the lack of mains noise, or switching noise, coming from the power converter.   I.e. if there was a buzzing noise before, due to the power supply, that same noise will not be present when using a battery.

I am having trouble parsing  that last sentence:

Would I be able to be switch from 12v dc, skipping the transformer, and plugged into the wall using the tranformer if i wired it to be able to do so, and would that have any long term effects on the speaker?

But it sounds like you are saying you want to use the battery some of the time, and use the whatchacalit... AC adapter, power supply, to power it at other times.

Again I think that would be agreeable to the amplifier. I expect it would be "happy" to get power from either of those sources.