rms vs aes

"clipping strongly increases the AVERAGE Power level and heat dissipation across the voice coil"

myser wrote: yep am Buddhist ...Chinese proverb say - " he who goes to bed with itchy bum awaken with smelly finger  "

He who goes to bed with stiff problem wakes up with solution on hand

Ok? Why?

"completely" Is not a very convincing argument:-) actually it's very bad!-(
If you say that I'm completely wrong, and not just partly wrong, then I'm sure you're WRONG!

The internet is filled with arguments that I present the very logic result of clipping:

Wikipedia: "This extra power can cause damage to loudspeaker components"

Others: " this is clipping. During this time, the current from the amplifier is heating up the speakers voice coil. Since no additional cone movement is occurring, you essentially have a small stove element. Yep, the one where you make your macaroni and cheese. This voice coil continues to heat up until the glues and varnishes that hold the wires in place fail, or the connection to the cone or spider overheat and fail. And there you have it, a blown speaker."

From Peter Papp:
"The clipping seriously increase the THD, typically by several tens of %... sounds pretty bad.
The clipping strongly increases the AVERAGE Power level and heat dissipation across the voice coil
The clipping could create extra harmonics which located may outside (lower / higher or booth) of the actual speaker and this way may hurt the mechanical structures.
At the moment of clipping the amplifier completely looses control of speaker movements!"

nativelayer wrote: Diving into the nominal power discussion: B + C driver is advertised on one site 200W Nominal Power and another 400W Continous Power. My amp plan had been to power two of these with 400W (x2 Nominal power rating) each side - should I be thinking more along the lines of 800W (x 2 Continous power rating? How much juice would be reasonably safe (theoretically leaving aside box dynamics)? I have looked around regarding this and got confused with all the conflicting answers....Newbie after all :)

2x "nominal" (or 1x program power) is a good value to aim for when it comes to matching drivers to amps.

And there is no such thing as "reasonably safe". Never rely on "amp max power" for driver protection - NEVER! That's what your LMS/limiters are for..

I've always been told that clipping will result in a square like waveform because the wavetops are cutoff, like turbosound & more show in their guides.

Taking a look at cone movement from squarewave looks horrible! The amp will try to force the cone to move from one limit to the other in no time, ripping it hard, then it will keep it in this posistion during the clip wave leaving heat like dc in the coil before pulling it back hard & over again.
Is this wrong?

The reason I dig into this thread is actually that the digam7000 has 1910w@4ohm / ch measured EIAJ, what is an eaij test? Something about tests here:
http://www.doctorproaudio.com/doctor/temas/powerhandling.htm

You might be wondering what I'm up to, having 24 pcs fane 18-1500 bph takes some power to drive!
I have 4 pcs digam7000, but it's not really enough, So I'm buying two lab gruppen fp13000, This can drive 8 pcs 18-1500 @ 13000w, some people suggested that I use one amp for all 12 subs per side, but this is 6 per channel! I wouldn't do that, normally I never do 2 ohms, only did that with digam & lab.

It's a matter of power, I was planning to run each side with one digam with 4 subs & one lab with 8 subs, this is 1910w for the four & 6500 for the eight, not exactly equal, I was thinking to give the 4 bph on top of the stacks less power, as they are likely to have more excursion not coupling ground or boxes on top.

Does this make sense? 4 pcs lab 13000 would be better, but they're damn costly!

Edited by tv00 - 01 December 2013 at 4:37pm

No, the extra power content from harmonics when clipping is trivial.

With program material with high dynamics, the increase in average power during non-clipped passages is what burns out the tweeters.

In general, woofers die from mechanical problems before they die from too much long term average power. It is essential to evaluate the box design and cone excursion on a given design before deciding how much power to hit the cabinet with.