How much RMS over stated is too much?

[CrossFired 10+ year member]

I got a JL 300/4, that is 75 RMS, I would like to match with some JL Speakers, they rate theirs at 60 RMS, But I might go with a few other choices, question is how much RMS can you go over the stated and be fine?

Who can say? ever brand is different. The setup you've got sound perfect.

I always try to do systems with 20% more power than needed.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[overkill phil 10+ year member]

you should be safe with around 1300 watts above rated rms

Ru stupid? look what u wrote sart guy

 

[bigbangtheory 5,000+ posts]

There are a lot of factors really. The people recommending you can give a lot of power are active, which means they have the processing and in turn can eat up more power while still sounding good. Passive crossovers are a little more pickey. I say don't go over 50rms on passive crossovers and that is being generous. I say really no more than 20, but depends how long you listen to it loud and how your amp is setup.

I have only 50rms to my new Pioneer TSD-720C's and they sound wonderful. I don't understand why people have to run so high over the RMS to sound loud and good whild doing so. Buddy has an active setup in his car and it is loud, but not much more than mine and he has 200rms to each side on some Focal componets, which were like 5x more than my set, lol!

Just depends I guess.

Better to be safe than sorry, so I will end with that. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[CrossFired 10+ year member]

There are a lot of factors really. The people recommending you can give a lot of power are active, which means they have the processing and in turn can eat up more power while still sounding good. Passive crossovers are a little more pickey. I say don't go over 50rms on passive crossovers and that is being generous. I say really no more than 20, but depends how long you listen to it loud and how your amp is setup.
I have only 50rms to my new Pioneer TSD-720C's and they sound wonderful. I don't understand why people have to run so high over the RMS to sound loud and good whild doing so. Buddy has an active setup in his car and it is loud, but not much more than mine and he has 200rms to each side on some Focal componets, which were like 5x more than my set, lol!

Just depends I guess.

Better to be safe than sorry, so I will end with that. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

You've got it reversed! Active setup's need less power(more amps).

A passive crossover sucks lots of power. It's true that you can use more power with active, but an active system will sound better than passive (if crossed right)with the same or less power.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[FoxPro5 5,000+ posts]

Simple answer: RMS is not average power.

You need to understand how amp manufactures and speaker manufacturers rate their equipment. When you really look at it, it's not about the ratings, it's about how you use the power you have. You can absolutely destroy a speaker with 75 watts even if it's rated for 150 watts. Conversely, you can also get excellent performance out of a speaker rated for 75 watts with 150 watts of power.

At best speakers are 5% efficient. Your class A/B is about 50% efficient. There's also power compression, baffle step response, off axis listing effects, speaker sensitivity, etc. That's a lot of factors that must be included.

Buy as much power as you can afford. If it's 1000 watts RMS, go for it. Use your volume knob intelligently.

 

[dragnix 5,000+ posts]

You've got it reversed! Active setup's need less power(more amps).
A passive crossover sucks lots of power. It's true that you can use more power with active, but an active system will sound better than passive (if crossed right)with the same or less power.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

i was going to post the same thing, damn you for beating me //content.invisioncic.com/y282845/emoticons/mad.gif.c18f003ab0ef8a0d9c27ca78d77a6392.gif

 

[tcguy85 10+ year member]

Simple answer: RMS is not average power.
You need to understand how amp manufactures and speaker manufacturers rate their equipment. When you really look at it, it's not about the ratings, it's about how you use the power you have. You can absolutely destroy a speaker with 75 watts even if it's rated for 150 watts. Conversely, you can also get excellent performance out of a speaker rated for 75 watts with 150 watts of power.

At best speakers are 5% efficient. Your class A/B is about 50% efficient. There's also power compression, baffle step response, off axis listing effects, speaker sensitivity, etc. That's a lot of factors that must be included.

Buy as much power as you can afford. If it's 1000 watts RMS, go for it. Use your volume knob intelligently.

smart man right here!