how bad is .5 ohm

[rumple4skin 10+ year member]

untell im done ****ing with it anyway

then i am going to take it to a osiloscope and if im at .5 ohm load the amp dosnt have a "raited wattage"

so its much trickeyer

 

[2002XLT 5,000+ posts]

You never said that it was an amp rated at 100w...
Now I see what you are saying.. But how do you ever know what your amp can do exactly? Or do before a clipped signal.

Here is the forumla and a example.
Voltage of the output = sqrt(RMS Power X impedance of the speaker)

Example

Say the amp provides 100WRMS into a 4 ohm speaker:

Voltage = sqrt(100W X 4 ohms)

Voltage = sqrt(400W*ohms)

Voltage = 20V

//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

 

[miker 5,000+ posts]

//content.invisioncic.com/y282845/emoticons/cool.gif.3bcaf8f141236c00f8044d07150e34f7.gif

//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif:laugh://content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

 

[2002XLT 5,000+ posts]

I agree with Miker. You can't do a formula for the DMM unless you know the exact wattage of your amp. Even tho it says 1100 @ 2 ohm, you can't put 1100 into the DMM voltage calculator because the 1100 might be overrated. Seems like without bench testing the amp you can't know exactly, even with the DMM...

So birthsheets dont count? Or if you do a simple look on google you could probably find a pretty close number to go by, or ask on here. Like i stated in another post, my massive is rated at 3000 but is actually closer to 2600, so 2600 is the number i would go by, maybe even a little lower. Its a lot better then just assuming that your correct when you turn the "dial" up.

 

[2002XLT 5,000+ posts]

So guessing the actual watts your amp puts out is still much more accurate than guessing the gain knob percentage?
Just being a devil's advocate. It still just seems like a guess either way, but with a birth sheet I would feel more comfortable with that guess, yes...

Generally speaking your guess of an underrated amp would be much safer then saying "oh, well i think 70% looks right." Dontchathink? I see where your coming from though, but usually that info is available if you look hard enough.

 

[PSturmer 10+ year member]

I agree with Miker. You can't do a formula for the DMM unless you know the exact wattage of your amp. Even tho it says 1100 @ 2 ohm, you can't put 1100 into the DMM voltage calculator because the 1100 might be overrated. Seems like without bench testing the amp you can't know exactly, even with the DMM...

i only use dmm's to sync multiple amps together. the rest can be done by ear.

 

[miker 5,000+ posts]

i only use dmm's to sync multiple amps together. the rest can be done by ear.

arghh.. I rely want to know how to do it by ear.. lol

Like what do you listen for?

 

[rumple4skin 10+ year member]

rofl

just hook the **** thing up with the gains off and pray your ok tell you get to the audio store

 

[rumple4skin 10+ year member]

and fyi mike i used that rockford site i linked up there earlyer to tell you the efectiveness of your amp given your rms output of the amp or berth sheet. you must take into account the big three upgrade tho, if you do not have th big three upgraded grounds you cant put higher then 4 gauge wire into the spec or you will mess up your efectivness. however with the big three it is up to the wire. most cars come factory with 6-8 gauge grounds so tecnicly up to 6 gauge, anyway find out what the rms watts really are or atleast alot closer thatway, then you factor that number into the dmm volt formula and you have your actual output.

anymore qustions or concerns on the matter feel free to ask

 

[2002XLT 5,000+ posts]

arghh.. I rely want to know how to do it by ear.. lol
Like what do you listen for?

distortion.

 

[miker 5,000+ posts]

distortion.

nvm

 

[miker 5,000+ posts]

and fyi mike i used that rockford site i linked up there earlyer to tell you the efectiveness of your amp given your rms output of the amp or berth sheet. you must take into account the big three upgrade tho, if you do not have th big three upgraded grounds you cant put higher then 4 gauge wire into the spec or you will mess up your efectivness. however with the big three it is up to the wire. most cars come factory with 6-8 gauge grounds so tecnicly up to 6 gauge, anyway find out what the rms watts really are or atleast alot closer thatway, then you factor that number into the dmm volt formula and you have your actual output.
anymore qustions or concerns on the matter feel free to ask

Well.. My car is stock everything.. Here is a pic comparing the stock wire to some 4g wire... BUT as you see in one of the pics, there is a really small wire that runs with the large wire.. What is this wire?

 

[Haunz 10+ year member]

This thread is off the charts