Amp -what size what specs?

[u4david]

"volts from amp = square root(watts * ohms)"
is this square root x (watts x ohms)=volts needed for amp?

[Bruce Weldy]

"volts from amp = square root(watts * ohms)"
is this square root x (watts x ohms)=volts needed for amp?

Here's the easy way. Use this calculator.

http://www.sengpielaudio.com/calculator-ohm.htm

Remember that the max voltage is in the plans for the subs. Some speakers can take the full voltage based on the wattage rating on the speaker - some can't, so follow the plans on those.

[u4david]

"volts from amp = square root(watts * ohms)"
is this square root x (watts x ohms)=volts needed for amp?

Here's the easy way. Use this calculator.

http://www.sengpielaudio.com/calculator-ohm.htm

Remember that the max voltage is in the plans for the subs. Some speakers can take the full voltage based on the wattage rating on the speaker - some can't, so follow the plans on those.

could you give me example using delta lite 2510 specs?
What is that is used to calculate it and how.
Thank you

[Radian]

Here's the easy way. Use this calculator.

http://www.sengpielaudio.com/calculator-ohm.htm

Bruce! Are you trying to kill the lad?!! That website is a visual train-wreck IMO.

Please try this website. Same thing, MUCH more user friendly IMHO:

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

For the example requested...enter the RMS power (watts) and impedance (ohms) into the very last formula on the page and click on the equal sign.

[u4david]

I do not want to be total ignor but could you use the 2510 specs so i see how you use it?
prefer using the math formula instead of a online tool.

[Bruce Weldy]

Here's the easy way. Use this calculator.

http://www.sengpielaudio.com/calculator-ohm.htm

Bruce! Are you trying to kill the lad?!! That website is a visual train-wreck IMO.

.

It's not pretty, but there is only one calculator on the page. Fill in two variables, get the one you need. Not sure your site is going to make it any easier on him..... Lots of formulas and empty slots there for a beginner. However, now he's got two choices - that ought to do the trick!

[Radian]

Dave,

Any more advice, and I'm gonna have to enroll in class and charge you tuition.

It's not pretty, but there is only one calculator on the page.

Good point Bruce...Realized that after I shot off my trap.

[u4david]

if the RMS of delta is 250 and the ohm is 8
the total i get is 44.7 V and 5.6 amp.

how this is goin to tel me the wattage required of the amp?
beside the quess of multiplying V X amps= watts?
44.7 x5.6 =250watts?

so the amp have to be least 250W no need fot overhead no nedd to reserve no need to?hell id do not know what may be involved in getting the right size of amp that is why i'm here and that is why i sound so ignorant cose i'm.

[Bruce Weldy]

I do not want to be total ignor but could you use the 2510 specs so i see how you use it?
prefer using the math formula instead of a online tool.

OOPS....I was wrong, that didn't do the trick.

"Gee mister, thanks for the free meal and the wine was great. The desert was wonderful. Since you are buying, can I order a little something to go?"

Sometimes, no matter what you do - it just ain't enough.

Look, if you want to do it with math (which by the way is exactly how the online calculators do it ), use Google to research all the theory and formulas you want. No matter how a question is answered, you just won't go try it out before saying that it's not what you want.

[u4david]

that is what i wont just braked down to understand it and by being here that is my part of research.

[u4david]

I do not want to be total ignor but could you use the 2510 specs so i see how you use it?
prefer using the math formula instead of a online tool.

OOPS....I was wrong, that didn't do the trick.

"Gee mister, thanks for the free meal and the wine was great. The desert was wonderful. Since you are buying, can I order a little something to go?"

Sometimes, no matter what you do - it just ain't enough.

Look, if you want to do it with math (which by the way is exactly how the online calculators do it ), use Google to research all the theory and formulas you want. No matter how a question is answered, you just won't go try it out before saying that it's not what you want.

if the RMS of delta is 250 and the ohm is 8
the total i get is 44.7 V and 5.6 amp.

how this is goin to tel me the wattage required of the amp?
beside the quess of multiplying V X amps= watts?(not accurate formula but widely used)
44.7 x5.6 =250watts?

so the amp have to be least 250W no need fot overhead no nedd to reserve no need to?hell id do not know what may be involved in getting the right size of amp that is why i'm here and that is why i sound so ignorant cose i'm.

[Bruce Weldy]

so the amp have to be least 250W no need fot overhead no nedd to reserve no need to?hell id do not know what may be involved in getting the right size of amp that is why i'm here and that is why i sound so ignorant cose i'm.

Ok, now we get to the real question.....

No, you don't have to have a bunch of headroom as you will typically limit your system anyway. However, most will come down on the side of having a little more power than is needed so when running at the limit of the speaker, you've got plenty of juice and don't have to worry about overheating.

For subs, I like having a little extra. For tops, you shouldn't run them close to the rating of the speaker anyway, so matching the amp wattage to the speaker wattage will be sufficient.

The only reason for the voltage calculation is when figuring out the wattage needed to comply with the paramaters that are listed in the plans.

If this is just too much to get your head around, don't sweat it - just build the speakers, then tell us what you built and what speaker is in 'em and how many you got -- we'll make you a list of appropriate amps. There is no reason to buy amplifiers before you build the boxes anyway. Cart before the horse.....

[u4david]

i wont to understand it.i will look the speaker specs i get the RMS from there and ohms from there.

and the formula to get total volts and to get total amps is?(if someone can answer this in dummy version I appreciate it)
and then i get the totals of that and multiply them together to get watts needed to run it.

[Bruce Weldy]

i wont to understand it.i will look the speaker specs i get the RMS from there and ohms from there.

and the formula to get total volts and to get total amps is?(if someone can answer this in dummy version I appreciate it)
and then i get the totals of that and multiply them together to get watts needed to run it.

You are going in circles. If you start with a speaker and convert it into volts, then turn right around and convert the voltage back into watts - IT'S THE SAME AS WHEN YOU STARTED!!!!

The only reason that you need to do this calculation is if you know how many volts you are limited to (from the plans). Then you take the voltage and the ohms to calculate how much wattage your amp needs to drive the speaker. You are starting with wattage, converting it volts, then converting it back to wattage. Why?

If you don't know what the voltage is limited to, then just buy an amp that will support the wattage of the speakers.

I don't know how to say it any plainer.

[u4david]

so RMS IS the amplifier requirement!
No program,no peak is the RMS that my amp have to have.
Ok got it.

And yes going in circles seems to be my talent