17 volts
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=93100
Printed Date: July 13, 2025 at 9:32 AM
Topic: 17 volts
Posted By: abruptcc
Subject: 17 volts
Date Posted: April 18, 2007 at 5:33 PM
the amp i just purchased that has a 17 volt power rating on it. how do i run 17 volts to the amp?
Replies:
Posted By: haemphyst
Date Posted: April 18, 2007 at 5:47 PM
With a dedicated, as in COMPLETELY SEPARATE, 17 volt electrical system. There is a reason you don't have a 17 volt system in your car right now, and that reason is: BECAUSE EVERYTHING ELSE IS SUPPOSED TO RUN ON 12 VOLTS. Ty upping your voltage on your stock system, and you're gonna fry everything else in the car. Your amp will run perfectly fine on it, but you are not driving anywhere to listen to it.
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: austincustoms
Date Posted: April 21, 2007 at 11:23 AM
You could try a power converter, but I don't know where you would find one like that. If you did take that route though, keep amperage draw in mind. I could be wrong here, but I believe for every volt you increase, it will draw 2x the amps. Say for instance it draws 20 amps at 12 volts, it would draw 640 amps at 17 volts. Like I said, I could be completely wrong here, but that's something to keep in mind.
Posted By: haemphyst
Date Posted: April 21, 2007 at 6:34 PM
Wow... Inefficiency at it's BEST 
No, you still have to know the output power requirements... the transfer laws remain the same. Just pretend that the converter is really nothing more than an amplifier ('cause that's all it is... with rectified outputs, instead of AC outputs.) ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: sedate
Date Posted: April 22, 2007 at 3:09 PM
austincustoms wrote:
Like I said, I could be completely wrong here
Whaa?! You ARE completely wrong here. Okay you have the math wrong, and the basic science wrong. As you increase voltage, you DECREASE current draw. 20 amps at 12 volts = 240 watts 640 amps at 17 volts = 10880 watts There are obviously NOT the same numbers. austincustoms wrote:
I believe for every volt you increase, it will draw 2x the amps.
What? Electrical devices really only draw the power they need, if you run more voltage to amplifier, it will just draw less amps.. or less current. The POWER that is used.. here measured in watts, remains the same. Volts x Amps = Watts ------------- "I'm finished!" - Daniel Plainview
Posted By: aznboi3644
Date Posted: April 22, 2007 at 10:40 PM
sedate wrote:
austincustoms wrote:
Like I said, I could be completely wrong here
Whaa?! You ARE completely wrong here.
Okay you have the math wrong, and the basic science wrong.
As you increase voltage, you DECREASE current draw.
20 amps at 12 volts = 240 watts
640 amps at 17 volts = 10880 watts
There are obviously NOT the same numbers.
austincustoms wrote:
I believe for every volt you increase, it will draw 2x the amps.
What? Electrical devices really only draw the power they need, if you run more voltage to amplifier, it will just draw less amps.. or less current. The POWER that is used.. here measured in watts, remains the same.
Volts x Amps = Watts
agreed...OHM'S LAW simply
Posted By: austincustoms
Date Posted: April 23, 2007 at 4:57 PM
Yeah, after I posted that, I realized I was thinking of another formula. But If you're using a converter, that would still consume energy in addition to the power the amp draws. All in all, highly in efficient for the work this would require.
Posted By: KPierson
Date Posted: April 24, 2007 at 11:17 AM
aznboi3644 wrote:
sedate wrote:
[quote=austincustoms] Volts x Amps = Watts
agreed...OHM'S LAW simply
Haha, Ohms law states that V=IR It has nothing to do with power. You also have to remember that ohm's law can't be directly on the input side of an amplifer anyway unless you know the exact efficiency of the amplifier. ------------- Kevin Pierson
Posted By: sedate
Date Posted: April 24, 2007 at 11:38 AM
KPierson wrote:
It has nothing to do with power.
? The relationship between them is all about power. https://www.the12volt.com/ohm/ohmslaw.asp Anyway, back to our OP. I've seen some really cheesy Korean and Chinese amps sold at those goofy car audio shows that are rated at 17 volts. They get weirdo ratings like that out of them by packing them in dry ice and running 17 volts to them... of course the resulting rating won't have a THD number attached... so then they charge $49 for a 1000watt amplifer half the size of a carton of smokes... the public comes into this stuff like they do those goofy computer shows.... trying to get some kinda deal that is wayyy to good to be true.. ------------- "I'm finished!" - Daniel Plainview
Posted By: aznboi3644
Date Posted: April 24, 2007 at 3:57 PM
ohms law can be manipulated to many different variations
Posted By: the12volt
Date Posted: April 24, 2007 at 4:31 PM
aznboi3644 wrote:
ohms law can be manipulated to many different variations
Ohm's Law is not Ohm's Manipulation. Ohm's Law cannot be manipulated. It is what it is. If you meant that there are many different/various equations with Ohm's Law, then you are correct ;) ...oO(couldn't resist) -------------  the12volt • Support the12volt.com
Posted By: aznboi3644
Date Posted: April 24, 2007 at 6:51 PM
the12volt wrote:
aznboi3644 wrote:
ohms law can be manipulated to many different variations
Ohm's Law is not Ohm's Manipulation. Ohm's Law cannot be manipulated. It is what it is. If you meant that there are many different/various equations with Ohm's Law, then you are correct ;) ...oO(couldn't resist)
oh well thanks for clearing that up...I wasn't sure cuz during my physics class about a couple months ago we were going over circuits and other crap and ohms law...basically my teacher went off on the variations...lol I was exhausted by the end of class
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