doubt´s lol

[Papermaker85 5,000+ posts]

hi there i have a couple of doubt´s
1- i have a amp that is 4, 2, 1 ohm stable, what´s the default resistence without any sub conected?

ex: if i want to measure de voltage to calculate the aproimated power a cant doit with subs conected cuz i will blow them kkk so i like to know that so i can calculate

that would be the output impedance of the amp.. should be .05 or so. voltage squared/impedance gives you power output. say 60 volts. 60x60=3600/2=1800. you want to measure ac voltage and amperage with a load connected to get power.

2- my hu has 2v pre out´s, is it worth to upgrade to a 4v pre out´s hu?

benefits? bether/clean signal, that i know, but with a strong/higher voltage signal i will need less gain on the amps to get the same power that i have now??

if the amp can match the input level it won't make much of a difference..

 

[Papermaker85 5,000+ posts]

amplifiers play whatever load is connected to it, usually from their lowest rated impedance (usually 1, 2, or 4 ohms) up to (in theory) infinity
you only need to worry about an amplifier that is stable for the load you're connecting to it.

2v pre outs are just fine, many people run 2v pre outs and have great sound

read this:

https://www.amplifiedparts.com/tech-corner/speaker-impedance-power-handling-and-wiring

an infinite load means no resistance aka no current flow aka no power.. just saying

 

[-------]

WOW... 162.7?.. goodness gracious!.. @ what hz.... 32?

dont know, dont ask, cuz at first i was thinking "hoo is BS story just to make belive that i buy a good amp" but after instal it see that the amp make way more power that is supouse...

 

[-------]

nah it was open and mess with at the pawn shop you bought it from and unfortunately at max gain clipping to **** it only makes 900 watts.

what part of 900 watt AT 4 OHMs dont u get? its suppose to be 250 not 900....

 

[-------]

Besides clipping, there are two more reasons why he's possibly seeing 59.xvAC
He's wired at a nominal 4ohm load.

He THINKS that resistance and impedance are the same value.. Obviously they are not.

According to the spec, the AC rail will never change with impedance.. Let's assume this isn't true with real high impedance.

Wired at 4ohm, he's probably rising around 10-14ohms on a tone.

Given that amount, the AC rail has no where near the resistance to fight with the current load, hence the rail will go way up.

Another thing is their is there is something inside causing a voltage leak and the user is just measuring it.

Clamp the DC side and see how much power it's pulling.. Bet it's about 20A or so instead of rhe assumed ~90A.

OP, i bet your DC voltage stays pretty solid at 14.4v, right?

If so, just more circumstantial proof the amplifier is not putting out what you think it is.

new battery, big 4 done and it dropes till 13.2v

 

[shizzzon 10+ year member]

Hmm.. interesting. Only way to know is to actually clamp it.

There are far too many variable unknowns and impossible to calculate on paper without clamping it.

 

[hispls 5,000+ posts]

i just want to know what kind of power it is making

Then you will need access to an oscilloscope and a current clamp. You have determined a number to brag about to your buddies but your methods do NOT give any accurate data on how much power that amp makes.

 

[hispls 5,000+ posts]

dont know, dont ask, cuz at first i was thinking "hoo is BS story just to make belive that i buy a good amp" but after instal it see that the amp make way more power that is supouse...

Crossfire is a good amp and you certainly got a good performer but your "test" is not accurate and you are absolutely NOT getting 900W unclipped sine wave into 4 ohms.

 

[wew lad 5,000+ posts]

an infinite load means no resistance aka no current flow aka no power.. just saying

No one cares. If you'd read you'd see I said up to infinity. Stop trying to inject useless knowledge to show you're "smart"

 

[staan]

so video it at 1 ohm crank that gain all the way up and lets see that 240 volts bullshiffer

 

[shredder2]

u want to the smar *** guy ok..... it makes 900 AT 4OHMS not 250 like its rated.... its rated 1k at 1 ohm but i dont even think about pushing the gain up at 1 ohm cuz probably is putting out way more than 1 k thats wy i make the questions of running no sub to test... but if it makes 900 at 4 ohms i ask, who much can i makes ate 2 or 1 ohm

Go-on and believe what you will... but if you set gains to try to duplicate that result you claim you're getting you'll be sorry

 

[Papermaker85 5,000+ posts]

Go-on and believe what you will... but if you set gains to try to duplicate that result you claim you're getting you'll be sorry

Kmsl

 

[Papermaker85 5,000+ posts]

No one cares. If you'd read you'd see I said up to infinity. Stop trying to inject useless knowledge to show you're "smart"

You mad bro?

 

[Papermaker85 5,000+ posts]

Completely disregards the pic and sees female in the back

 

[Louisiana_CRX 5,000+ posts]

Completely disregards the pic and sees female in the back

A couple of them