1500 watts at 1 ohm = what voltage

[fatboyracing 10+ year member]

??

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[fatboyracing 10+ year member]

is it 38.72

 

[ShiningBuick 10+ year member]

Yes.. but you'll need to figure in impedance rise and junk.. I don't know how to do that :>

 

[fatboyracing 10+ year member]

not sure what that means

I am going to run a sub at 1 ohm and the amp is rated at 1500 watts at 1 ohm so I need to see 38.72 volts right

 

[Lakota 5,000+ posts]

Just turn the gain to where the music sounds clean. Screw the dmm gain method.

I see that you're from Evansville. Go hang out with the DC's Car Audio guys. They're all really cool.

 

[n2audio 5,000+ posts]

not sure what that means
I am going to run a sub at 1 ohm and the amp is rated at 1500 watts at 1 ohm so I need to see 38.72 volts right

Yeah, that's what you're looking for.

I like the dmm method personally. It's quick and easy and assures you won't clip the amp.

You CAN get pretty close by ear, but based on a LOT of systems I've heard, most people don't.

 

[Lakota 5,000+ posts]

In my opinion the method isn't very accurate, but I guess it's a start for someone who has just started.

 

[dman4486 5,000+ posts]

In my opinion the method isn't very accurate, but I guess it's a start for someone who has just started.

if the tech can calculate imp rise for the system(system specific) @ whatever frequency the gain is to be set, then it is very accurate.

problem is rise changes....and what is 1500wrms at 30hz may not be 1500 at 40 or 50hz.

 

[alvitae 10+ year member]

This is a good chart to save for that.

 

[dman4486 5,000+ posts]

This is a good chart to save for that.

unreadable. it is easier to just do the math.

 

[ultimate157 5,000+ posts]

Yes.. but you'll need to figure in impedance rise and junk.. I don't know how to do that :>

You never try to factor impedance rise in choosing or setting up an amplifier. You are asking for trouble if you do. Calculating impedance rise also depends on so many variables that it will NEVER be the same.

Yeah, that's what you're looking for.
I like the dmm method personally. It's quick and easy and assures you won't clip the amp.

You CAN get pretty close by ear, but based on a LOT of systems I've heard, most people don't.

Not always true. If you have a weak input signal (HU volume not turned to optimum position) and try to reach your target voltage, it will be a nice square wave.

 

[Lakota 5,000+ posts]

I don't understand why people don't just set their gains by ear? If you're worried about blowing up your sub then you probably shouldn't have a system.

I'd much rather do it by ear or use an oscilloscope, although I use a Termlab to set mine.