sub/amp question

[00project]

i purchased a rockford fosgate P3001 mono amp that states on the outside of the box:
150x1 at 4 ohms, 300x1 at 2 ohms.
However, inside the box theres a certificate stating 245watts at 4 ohms, 420w at 2 ohms.

3 questions:
1. where does this difference come from?? which number is more accurate?
2. will this power a 350w rms sub sufficiently?? (infinity kappa perfect 10.1)
3. i have heard that you should always OVERpower subs, but have also been told that if you underpower, having an amp that can supply 70% of the sub's power is sufficient. which is true?

thanx!!:)

[13inches]

The birth certificate is correct. Amps are regularly underrated by the manufacturers for competition purposes.

[enko]

You didn't mention the ohm rating of the sub, but it looks like the AMP is not powerful enough.

Your amp should have more power then your sub. A ****** amp works harder for a bigger sub, which causes distortion, which sucks.

[Sylvestre]

i purchased a rockford fosgate P3001 mono amp that states on the outside of the box:
150x1 at 4 ohms, 300x1 at 2 ohms.
However, inside the box theres a certificate stating 245watts at 4 ohms, 420w at 2 ohms.

2 questions:
1. where does this difference come from?? which number is more accurate?
2. will this power a 350w rms sub sufficiently?? (infinity kappa perfect 10.1)
3. i have heard that you should always OVERpower subs, but have also been told that if you underpower, having an amp that can supply 70% of the sub's power is sufficient. which is true?

thanx!!:)


your sub is 350 yet you bought an amp that (on the box)maxes out at 300 (assuming it's 2ohm)? Why?
Sorry but whoever said 70% is enough is wrong. Get a 350 or higher amp, plain and simple.
*IF* it's 2ohm, you should be okay.

[00project]

it is a 4 ohm sub. thanx for the input so far

[Pipes]

Just to clarify some misleading information, underpowering a speaker can NOT damage it. What can damage the speaker is turning up the gain and/or volume so far as to drive the signal into clipping. Since you'll tend to want to turn up the volume more with a less powerful amp, that is where the false idea of 'underpowering a speaker can damage it' comes from. Even a little bit of clipping isnt going hurt the sub especially since the power handling of the sub is rated higher than the power output of the amp.

IMHO, if your setup is installed properly, (which is just as, if not more important than the actual equipment you're using), and as long as you're not going to be ******** with the volume and push the sub until it's just farting out noise, i think it'll work just fine for you.

[googoo]

"underpowering a speaker can NOT damage it."

Yes, you can wreck a speaker by underpowering it, esp when people push the amp into clipping .

Remember that the amp and the receiver can clip, but having the sub amp clip is much worse than the headunit, esp if the subwoofer and amp are well matched.

Brent

[00project]

so as long as i dont blast the thing it'll be fine??

im not an audiophile, nor do i need my neighbors to hear me....just looking for a little bass. I was thinking about downgrading to a lower end sub but if this is a decent setup, i'll go with it.

[Pipes]

ya man it's a decent setup. That sub you have is good quality, built like a tank, and you're not going to hurt it even if you do blast it. And if anyone else tries to tell you underpowering a speaker will damage it, feel free to laugh at them while you ask them why your speakers dont self destruct every time you turn the volume down (which is the same as giving it less power).

A somewhat technical explanation here http://www.bcae1.com/2ltlpwr.htm
That whole website is a definite bookmark if you're interested at all in car audio.
But hey, people are gonna believe whatever they wanna believe. But since YOU are spending the time and money on YOUR audio equipment, go for the facts instead of the myths.

[grant]

"underpowering a speaker can NOT damage it."

Yes, you can wreck a speaker by underpowering it, esp when people push the amp into clipping .
The problem there isn't "underpowering a speaker", the problem is "not enough power to make it loud enough for what the person wants to hear."

It doesn't matter if the speaker is rated 350w or 3,500w, if your amp gives you enough power for how loud you want it it will be fine.

[00project]

thanx for the responses.
i have a cheapo 50w sony sub as part of a home entertainment 5.1 and it does the job even when i listen to music, so i imagine 245w will be enough to keep me happy for years to come.:)