Low voltage, why its dangerous

[RookieMekanik 10+ year member]

Asking here as well, what people think its dangerous ?

What happens exactly IN the amplifier while the voltage drops low 10's ?

I mean im looking for the technical answer here, not just heat and smoke talk //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Cheers

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[CobraStang98 10+ year member]

Nothing happens if u have a Sound Digital amp... They can go all the way down to 7.5 volts without going into protect.

 

But if u have other "regular" amps, when they get really low voltage they will heat up and you'll see sum smoke if they don't go into protect first. That's the answer u wanted right?? lol

 

[RookieMekanik 10+ year member]

Thanx for the reply CobraStang98 //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

But what exactly heats up and goes to smoke ?

I mean im looking here for the process whats happening in the amp ... As pwm (usually TL494 or analog ?) chips supposed to work perfect between 7-40 volts ...

 

[PaulD 10+ year member]

ok, what REALLY happens is a simple result of ohms law type stuff at work. P = V X I, which says that Power (in watts) is equal to the Voltage times the Current (I). So if the power consumption of the device (the power amp in this case) stays the same and the voltage drops then the current MUST increase by a like amount. Example .... If an amp is pulling 120 watts RMS and the battery volts is 12, then the current must be 10 amps (120 = 12 X 10). If the battery voltage drops to 10 volts then the current will have bump up to 12 amps (120 = 10 X 12). Curent flow is what causes a heat build up, so now do that same calculation with a 2000 watt amp and the voltage going from 14 V to 10 V or less and you will start to see the problem. The two sections that will heat up the quickest in an amp are the power supply FET's and output transistors.

 

[roarzorz 10+ year member]

To explain it for the simple minded, when you starve an amp of voltage it has to work harder to attempt to produce the same wattage. Working harder = getting hot. Getting too hot = letting out the magic smoke.

 

[WOT]

Ive blown the mosfets out of my visonik twice now from throwing it down into the low 10 volts, but I leanred and upgraded electrical

 

[Xprime4 10+ year member]

So if one was low volting his amp (say the alt is dead or only running on a almost dead batt) while playing music at low level, nothing would happen?

Volt drop are bad only because they heat up the inside components with higher amperage requirement?

So letting an the voltage drop under 10v while just playing music car off wouldn't be bad, if you aren't full tilting??? if the amp stays cold, everything is under control?

is my logical right?

 

[audioarsonal 10+ year member]

It is not suggested to run any amp under 11v for anything more then a burp.And that is very short burst with alot of cooling in between.

 

[WOT]

Shit still gets very hot even on low volume with voltage that low