17 volts

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abruptcc

Member - Posts: 8

Joined: November 29, 2005

Location: United States

Posted: April 18, 2007 at 5:33 PM / IP Logged

the amp i just purchased that has a 17 volt power rating on it. how do i run 17 volts to the amp?

haemphyst

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Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: April 18, 2007 at 5:47 PM / IP Logged

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.

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."

austincustoms

Copper - Posts: 232

Joined: November 15, 2005

Location: United States

Posted: April 21, 2007 at 11:23 AM / IP Logged

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.

haemphyst

Platinum - Posts: 5,054

Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: April 21, 2007 at 6:34 PM / IP Logged

Wow... Inefficiency at it's BEST 17 volts -- posted image.

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."

sedate

Silver - Posts: 1,173

Joined: July 03, 2004

Location: Colorado, United States

Posted: April 22, 2007 at 3:09 PM / IP Logged

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

aznboi3644

Gold - Posts: 2,600

This member consistently provides reliable information

Joined: May 01, 2006

Location: United States

Posted: April 22, 2007 at 10:40 PM / IP Logged

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.

Volts x Amps = Watts

agreed...OHM'S LAW simply

austincustoms

Copper - Posts: 232

Joined: November 15, 2005

Location: United States

Posted: April 23, 2007 at 4:57 PM / IP Logged

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.

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: April 24, 2007 at 11:17 AM / IP Logged

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

sedate

Silver - Posts: 1,173

Joined: July 03, 2004

Location: Colorado, United States

Posted: April 24, 2007 at 11:38 AM / IP Logged

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

aznboi3644

Gold - Posts: 2,600

Joined: May 01, 2006

Location: United States

Posted: April 24, 2007 at 3:57 PM / IP Logged

ohms law can be manipulated to many different variations

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