Problem with the system

[KMoney28]

Hahahaha I think all you guys just like arguing with each other. Every thread turns into an argument between the same 5 people or so, and then everyone loses site of why the thread was originally posted. Instead, it turns into a forum where everyone gets overly defensive of why their opinion is right, which in-turn ends up frustrating the original thread poster, because their problem remains. Anyways, turns out one of my subs is blown so the amp was going into protect mode so it wouldn't blow the amp itself....

[sr20de4evr]

Originally Posted by Navy I.C.

i know there are some real electricians out there, and i'm willing to bet they're laughing harder than I am...

I'm an electrical engineer, and you're right I am laughing pretty hard, because this argument is retarded. Not using a DMM at all won't threaten your life, so how would using a $20 one threaten it? And what extra features on a $200 one would eliminate this deadly threat that a $20 one can't?

You can grab both battery terminals and not feel a damn thing, you could grab any of the wires in your entire car and the most you'll ever feel is a small buzz. We're dealing with 12V systems, not 10,000V systems, nothing you can do short of cutting the battery open and drinking the battery acid will do anything serious to you.

As for the question at hand, it sucks that your sub is blown, but it's good that you found the cause at least.

[Haibane]

Well... adam... looks like I am doing the same major as you... this is my first year as an E Engineer Major. So I am having fun doing this stuff. I agree, not much you can do to really screw yourself up with the car electronics, but you can screw your car up.

[CBFryman]

>> I hope its just a loose wire(don't think it's a blown fuse cuz i bought an extra big one) but I'm not totally sure. I'm gonna have a friend look at it Monday hopefully.<<

YOU DID WHAT???? REPLACED THE FUSE WITH AN EXTRA BIG ONE...more than likely if you replaced the fuse on your amp with one greater than that which your amp originally called for you just fried your amp beyond repair...alowing more ampere's to flow allows more wattage which kills your amps circutry....why oh why do people do this kind of stuff......

[CBFryman]

I'm an electrical engineer, and you're right I am laughing pretty hard, because this argument is retarded. Not using a DMM at all won't threaten your life, so how would using a $20 one threaten it? And what extra features on a $200 one would eliminate this deadly threat that a $20 one can't?

You can grab both battery terminals and not feel a damn thing, you could grab any of the wires in your entire car and the most you'll ever feel is a small buzz. We're dealing with 12V systems, not 10,000V systems, nothing you can do short of cutting the battery open and drinking the battery acid will do anything serious to you.

As for the question at hand, it sucks that your sub is blown, but it's good that you found the cause at least.

__________________

...you may not be hurt from the actual voltage itself...sine even with your hands wet from hand to hand across your heart is anywhere from 20,000-40,000ohms...and with dry 4-5 times that...but if you are wearing jewlery of any kind and there happens to be a short that is across your metal jewlery...well lets just say you are going to have hella bad 3rd degree burns and probably have to have the ring, watch, or w/e cut from your body because your flech will have burnt to the metal...

[Navy I.C.]

am I the only one who know that the amount of mho's your body present to a ckt is dependent upon various factors, (your body's salinity, your body fat %, etc.), and not just if your hands are wet. I mean how much (I) does it take for your natural pacemaker to make your heart beat? And how much (I) does it take to stop it?

[sr20de4evr]

Originally Posted by CBFryman

YOU DID WHAT???? REPLACED THE FUSE WITH AN EXTRA BIG ONE...more than likely if you replaced the fuse on your amp with one greater than that which your amp originally called for you just fried your amp beyond repair...alowing more ampere's to flow allows more wattage which kills your amps circutry....why oh why do people do this kind of stuff......

The fuse isn't a regulator, it's a safety device. Replacing a fuse with one that's larger won't have any negative side effects unless the amp is already screwed up. And if that's the case, a larger fuse will just allow more damage to happen before it blows, but the amp would have to screw up in the first place before anything would happen.

[sr20de4evr]

Originally Posted by CBFryman

...you may not be hurt from the actual voltage itself...sine even with your hands wet from hand to hand across your heart is anywhere from 20,000-40,000ohms...and with dry 4-5 times that...but if you are wearing jewlery of any kind and there happens to be a short that is across your metal jewlery...well lets just say you are going to have hella bad 3rd degree burns and probably have to have the ring, watch, or w/e cut from your body because your flech will have burnt to the metal...

that's true

[sr20de4evr]

Originally Posted by Navy I.C.

am I the only one who know that the amount of mho's your body present to a ckt is dependent upon various factors, (your body's salinity, your body fat %, etc.), and not just if your hands are wet. I mean how much (I) does it take for your natural pacemaker to make your heart beat? And how much (I) does it take to stop it?

yes it does depend on many things, but the resistance will never drop enough to where you can be harmed by 12V

and a pacemaker isn't attached to your hand now is it?

[alphalanos]

ahhahaahha

[Navy I.C.]

fuses are already rated higher than the (I) of the ckt, if they were not, then the ckt would constantly be underpowered or blowing...

mho's measure how easily electricity conducts through liquid (including body fluid). I spend 16 hours a day working with electricity. Well actually I spend about 8 hours working and 8 hours going through safety checks...

A $200 multimeter is better at measurements with exact tolerances...and, it also happens that it can read voltages just like the cheaper ones. I know we're only talking about car audio applications, and I'm not losing sight of that, but I just beleive better is better. The reason we buy them is because when you got a million dollar inertial navigator guiding you through an underwater mine field and the equipment reads meters and centimeters in volts and milivolts, all of a sudden that +/- tolerance is even more important.

[sr20de4evr]

yes I know what mhos are, it's just the reciprocal of ohms, pretty simple concept. Like I said the resistance from hand to hand will never drop enough (or the conductivity will never rise enough) to do any damage when working with 12V systems.

Yes a $200 multimeter is more accurate, but that goes straight back to what I said before. Knowing that the battery voltage is at 12.53 instead of the 12.51 that your $20 multimeter said isn't going to save your life in any way, and thinking that the DC resistance of your sub is 3.254 when it's really 3.257 isn't going to endanger you at all.


edit: I'll try this a different way. Instead of me defending how a cheap multimeter can't endanger you, lets reverse the roles. Please give me one example, just one, where having a .01% error on the measurement instead of .05% will save you from harm? Remember we're talking about car stereo systems here, not the guidance control system for a nuclear warhead.

[Navy I.C.]

I'm starting to feel like I'm not going to win this...

[TFFantasy44]

gah all this because I told him to get a $20 instead of a $200 one so he could spend the extra $180 towards a new amp. I still think your amp is blown, but I would say take the cover off and see if you can see if its blown.

[Navy I.C.]

all this because I'm trying to win my point, regardless of the topic, some people are just competitive...