check this infinity amp for me

[.::DuD3::. 10+ year member]

i can get some killer deals on infinity amps at bestbuy (just started working there) but their ratings are a little confusing.

REF611A

761W peak output @ 2 ohms

456W RMS (continuous) x 1 @ 4 ohms

657W RMS (continuous) x 1 @ 2 ohms

how can 761 be the max output if 657 is the rms rated power? are they just trying to mislead or what? iirc rms is half the total rating power.

Click to read more...

 

[Davie06tC 10+ year member]

well what is the model of the amp.

 

[Darren5531 10+ year member]

well infinity amps should be cea certified. Excuse me if I'm wrong but you should be able to go to the website enter the model number and then you will have the wattage. Don't know if that helps any but o well.

 

[.::DuD3::. 10+ year member]

REF611A, anyone know the true ratings?

 

[MisterGrubbs 5,000+ posts]

761 would be peak power, as in it aint really gonna happen lol

They're pretty reliable with their ratings, I would count on 657 w RMS

611a Monoblock or what?

*Edit* He beat me to the model - - - anyways, they are CEA rated and at 14.4 it will give you 650w rms, they're pretty solid little amps I wouldnt mind running them

 

[noob with an RS 10+ year member]

iirc rms is half the total rating power.

you belong at best buy. dont quit your dayjob. literally.

 

[.::DuD3::. 10+ year member]

yeah heres the website. doesn't make sense.

 

[.::DuD3::. 10+ year member]

you belong at best buy. dont quit your dayjob. literally.

its either 1/2 or 1/3, cant remember the exact number. but thats beyond the point because this can't be the true rms rating.

 

[.::DuD3::. 10+ year member]

you belong at best buy. dont quit your dayjob. literally.

Peak vs RMS: You know that peak power is 2*RMS power. If a speaker is actually capable of handling 150 watts of peak power it would only be rated to handle 75 watts RMS. If a speaker is rated to handle 150 watts 'music power', it may mean that the speaker will take only very short bursts of power approaching 150 watts RMS. Even if there are two speakers from different manufacturers which have the same power ratings, one of the manufacturers may be more conservative in their ratings than the other manufacturer. The more conservatively rated speaker would be more likely to handle its rated power. Bottom line, beware of power ratings on speakers. Knowing that some manufacturers are less than honest in their power ratings, will likely help you to make better decisions when buying speakers.

bcae1 > you //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 

[.::DuD3::. 10+ year member]

any other thoughts?

 

[diablowwy 10+ year member]

bcae1 > you //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

well....you should never buy an amp according to it's peak out put. The reason that some amp's peak is twice it's rms and others are only 100 more is because of the way they get the peak output. The peak is usually measured by running a huge current through the amp and getting the highest output before it blows up.... others use a less extreme method... but either way the signal is clipped and not good at all for your speakers or the amp. that's why you don't see highend audio companies list their peak output, it is a marketting gimmik more than anything and pretty much useless most of the time.

i'm pretty sure that the rms rating on that thing is accurate, infinity makes decent stuff...

 

[Immacomputer 10+ year member]

bcae1 > you //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

No. That is not correct at all. RMS is the Root Mean Squared, not "Half the peak power" as bcae says. Is it common that speakers are rated like this? Yes, it's very common. Amps, however, are very different in how they deliver power over different frequencies.

 

[.::DuD3::. 10+ year member]

No. That is not correct at all. RMS is the Root Mean Squared, not "Half the peak power" as bcae says. Is it common that speakers are rated like this? Yes, it's very common. Amps, however, are very different in how they deliver power over different frequencies.

well i know the rms is a physics term, theres a whole complete equation for it, but in the car audio world, its commonly referred to as 1/2 peak power correct? and back to the original question, why is the rms value so close to the peak value? it doesn't seem that efficient if those values are so close together.

 

[diablowwy 10+ year member]

well i know the rms is a physics term, theres a whole complete equation for it, but in the car audio world, its commonly referred to as 1/2 peak power correct? and back to the original question, why is the rms value so close to the peak value? it doesn't seem that efficient if those values are so close together.

if you must ask, you should be asking why the peak is so close to the rms....

as as i said before, peak output is close to useless....the only situation where they would be useful is to get an idea of what kind of power they can give on extremely short burps.

Also, like i said before, the reason that rms to peak ratio is different between amps is because of the different ways that the "peak output" is measured.

and i have never heard anyone referr to rms as 1/2 peak power before you...then again...i don't play around with Sh*tty companies that mainly advertises useless peak figures....