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Topic Review (Newest First)

03-14-2010 04:08 PM

Fallen

Re: Amplifier Output Voltage Calculator

Make sure it's not set to measure amps.
To measure amps a very low resistance resistor is used in series with the lead, and the voltage drop is measured across it to determine the current. If you measure the current with no load, it'll be a dead short across the amp. That would put it into protect pretty quick.

03-12-2010 08:48 AM

Dom_J

Re: Amplifier Output Voltage Calculator

Quote:

Originally Posted by crunkjuice1

No problem D all I wanted to know was if I did the math right. p1000-1bd amp @ 1 ohm (1000 watts) comes out to 31.62278 on one of those calculators I just want to know if its best to set it at 31.6 or just go to 32 amps/volts? I am sorry that even though I have dropped cash on a bunch of stuff already I don't have it to buy a O scope so at least by doing the DMM trick at least I would be getting into something of a "safe zone"

Gotchu, from what I was reading it looks like you should try to get it as dead on as possible, I'd try to get it to 31 then use the bass boost and deck settings to get you right on that extra .6....

I just gotta figure out why my amp is going into protection mode when I hit it with the volt meter.

03-11-2010 11:39 PM

crunkjuice1

Re: Amplifier Output Voltage Calculator

03-11-2010 04:10 PM

Dom_J

Re: Amplifier Output Voltage Calculator

I hear you, I'm feeling like a noob reading the ancient knowledge to some myself

...thanks on that, gotta check out that link.

Any time I'm a little stumbled on sub wiring and I wanna double check myself I use this.

Subwoofer Wiring Diagrams

If you got the dvc 4-ohm Type R's they should wire down to 1-ohm no problem. I used to run the exact same set-up as you, just sold it actually. It hit pretty hard

BTW, I have fluke meter and I tried to go out and do this stuff earlier...the meter kept sending the amp into protection mode??? I'm probably missing something...

03-11-2010 03:25 PM

crunkjuice1

Re: Amplifier Output Voltage Calculator

Dom J I found this in here hope it helps you I still need help on my end, What is acient knowledge to some is new to me but the good thing is that we can all learn in time and hopefully not be stuck up.

https://www.realmofexcursion.com/downloads.htm

03-11-2010 12:19 PM

Dom_J

Re: Amplifier Output Voltage Calculator

Well since its up...can anyone please direct me to a spot to get a decent 60hz test tone??

03-11-2010 04:52 AM

Fallen

Re: Amplifier Output Voltage Calculator

Quote:

Originally Posted by crunkjuice1

Hello everyone this is my first post and yes I am a noob

I have a fosgate p1000-1bd amp and two type r 12 500 rms each wired to 2 ohm each. so amp gain needs to be set to 31 volts? From what I read the running wiring like this presents a 1 ohm load to amp. I just want to know if I used the right formula, Thank you all for your patience and knowledge.

Way to bring an old thread back from the dead. It's ok, you're new to the forum.
Might want to post in the introductions section next time.

03-10-2010 09:20 PM

crunkjuice1

Re: Amplifier Output Voltage Calculator

Hello everyone this is my first post and yes I am a noob

04-29-2009 07:42 PM

travo

can someone re-cant my calculations?

For mine I got for 4500watts at 1ohm I need 67volts AC?

Is this right?

Also I thought you use like a 50hz test tone.

12-01-2008 06:02 PM

Fallen

Just the last one. They are all the same, I was just showing how you get voltage from power and resistance.

12-01-2008 04:44 PM

loudaccent

i dont need all 5 of thoes math problems up there dont i only need one?

12-01-2008 04:33 PM

Fallen

Yea thats what you gotta do. Be careful, 174V can kill you..

12-01-2008 04:30 PM

loudaccent

i completely under stand about that knob on the amp.. the math is confusing wen ever i had to set the gain on my 6000,, i just put the watts in and i belive the ohms or somthing and i got 174 so i put the dmm in the speaker out puts turn the gain will i hit 174,, it was just easer but i guess i got to do it the old way lol

12-01-2008 04:25 PM

Fallen

P=IV
I=V/R
P=(V*V)/R
P/R=V*V
SQRT(P/R)=V

I hope that helps.

Oh that won't tell you what to set the gain nob to. YOu need a DMM and to adjust the nob until the amp reads V.

The numbers on the nob are more or less meaningless

12-01-2008 04:20 PM

loudaccent

does any one have the calculator that you put in the watts and ohms,, and it tells you the number that you have to set your gain to

12-01-2008 04:04 PM

eagle12s

Quote:

Originally Posted by Xprime4

Using an 1606d with 800wrms worth of subs at 1ohm, i get 28.3volt.So i set it with the 50hz test tone. But when tryed listening my bassy rap song, the amplifier output never reach over 15 volt with strong bass. So since i don't listen to sine wave all day, could i set my daily bassy music at 28.3? Would it fried the subwoofer?

you need to use Gain Overlap to compensate for the strength of a sine wave. basically, use a -10db @40hz and set the voltage as if you were using a 0db tone for a calculated "boost".

11-24-2008 03:16 PM

audiobomb6400

Easy Algebra
square root your wattage then multiply by you ohm load
:]

11-24-2008 11:23 AM

StoneColdJesus

http://www.the12volt.com/ohm/page2.asp

6th down is identical to the original calculator linked in post one.

11-24-2008 09:53 AM

jagblazer01

found a new calculator
http://members.tripod.com/~masterslic/olcalculator.html

11-13-2008 06:21 PM

lilwillywilly

Quote:

Originally Posted by Used2Know

voltage = sqrt(power x impedance)

So, if im doing this right, and my amp puts out 150W @ 4ohm,
then i should come up with 24.49???

150x4= 600, sqrt of 600 is 24.49 correct?

Man i loved that calculator, made **** so much easier.

10-17-2008 02:32 PM

korey_hofer

sweet I couldn't remember what the hell it was for an equation

10-17-2008 02:23 PM

Used2Know

voltage = sqrt(power x impedance)

10-17-2008 02:05 PM

korey_hofer

yep gay anyone know of another I don't want to buy an o-scope right now

10-17-2008 02:03 PM

Xprime4

yeah the link is dead

it's a usefull tool , i used it to set my component to 300watt each ... only one degree on the gain make it goes from 250 to 400... so it got to be sharp!
i've never burn any speaker

10-02-2008 09:38 PM

T-Roy31

Quote:

Originally Posted by Orgazmo

what conecters on the leads for the dmm?

you dont just aligator clip them on the amps rca's, right?

would you just cut of a set of rca's and split off about 2 inches
of insulation and then alligator clip onto the bare wires?

that sort of thing?

Stick the pos and neg dmm leads in the corresponding speaker outputs on the amp. Proceed to set the dials on the amp (or w/e you wanna call it) until you match up the output voltage you're supposed to see. (Make sure the h/u is set to normal listening level, which should be about 3/4 of the way up)

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