quote:

Originally posted by richg101 3000! thats the highest i have heared of!

Exactly. This is because the K2 (and Crown's CTs2000 and CTs3000) use a BCA (balanced current amplifier) output stage rather than the typical class AB output stage... It's a very different sort of design that has significant benefits when it comes to driving low-impedance loads. As dampening factor is directly related to output impedance (internal impedance of the output stage, not the speaker), the low output impedance of the BCA stage significantly increases dampening factor.

The other benefit of BCA is lower power dissipation, so higher efficiency, less power drawn from the outlet, and lower heat output.

That said, I forgot the CTs2000 is also a BCA amp, and it will deliver 1000w/channel @ 8 ohms, so it's another good option for the EL36's, although quite a bit more pricey than a used K2... but is still in production.

http://www.crownaudio.com/amp_htm/cts.htm

Excuse me for asking, but why does the speaker gets blown from being underpowered?

I too have two Earthquakes, and when I first got them I bought a QSC PLX3402 Amp and a Samson Crossover. Man, that crossover made a huge difference as it only delivers the low frequencies to the amp. QSC No longer makes the PLX3402, instead it got replaced by the PLX3602 which delivers more clean power. Oh, and did I mention the amp is only like 20lbs and 2U Racks? Oh yeah!!! THAT's VERY LIGHT & SMALL for an amp that powerful.

BTW... I've NEVER been able to clip this amp!!! It's rock solid! The most solid AMP I've ever owned.

Last edited by DjWoody on Aug-29-2007 at 02:15

A crossover is mandatory to get decent sound out of subs

One thing to look for in a crossover is a subsonic filter, sometimes called a low cut filter, or high pass filter, which prevents the very low frequencies from reaching the amp.. 40hz is usually a good spot for this. If you have a 40hz low cut filter, crossover point around 120-130hz, you'll end up sending only 40-120hz to the sub. This is ideal.

Frequencies under 40hz don't have much response from the sub and can really bog down both the amp and the speaker itself.

I like the DBX 223 myself; it's a solid unit with a built in low cut filter at 40hz, XLR connections and it sounds good. It's also fairly affordable.

http://www.dbxpro.com/223/223.php

antronx... it's not that too little power itself blows speakers.. it's that when one runs a weak amp on a big speaker, they end up cranking up the amp to it's limits, and often end up running the amp into clipping. Clipping will take out a speaker quite quickly.

You can run a clean 20 watt signal into a big speaker all day... no problem. The problem comes when the waveform going into the speaker is clipped and distorted. I run a little 75w/channel amp into speakers rated 500w program power all day here at home, but I never crank it.. probably push 40 watts to them at the very most, which ends up quite loud in this little room. works out great... of course, it's alot more fun when I take these speakers out and hook them up to my big amp

quote:

Originally posted by MERiDiAN5i2 antronx... it's not that too little power itself blows speakers.. it's that when one runs a weak amp on a big speaker, they end up cranking up the amp to it's limits, and often end up running the amp into clipping. Clipping will take out a speaker quite quickly. You can run a clean 20 watt signal into a big speaker all day... no problem. The problem comes when the waveform going into the speaker is clipped and distorted. I run a little 75w/channel amp into speakers rated 500w program power all day here at home, but I never crank it.. probably push 40 watts to them at the very most, which ends up quite loud in this little room. works out great... of course, it's alot more fun when I take these speakers out and hook them up to my big amp

While that is true, there also is an issue with running too little power to drive the subs. I can't really explain it, I'll see if I can find the curves the guy from EAW used to explain it to me when I was setting up my club. There is some sort of reverse action caused by the size of the driver magnet vs. the power coming in from the amp that will cause the speaker to blow if it is underpowered.

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Interesting, have yet to read/hear of such a thing, but ya learn something new everyday!

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Originally posted by antronx Excuse me for asking, but why does the speaker gets blown from being underpowered?

using an underpowered amplifier usually means you will end up pushing the amp too far and end up distorting what is going into the loudspeaker. this is called clipping. it is where the amp's output is not a smooth sine wave, but a square/sine (the peaks and troughs of the sinewave get cut short as the amp reaches its peak operating range. the clipping point you can cause mechanical damage to the loudspeaker workings as well as causing voice coil deformation/burnout..

the scratching sound you get after over doing it on a loudspeaker is the sound of the voicecoil no longer running smoothly within the motor structure, but instead rubbing against stuff like the top plate/magnet structure..

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quote:

Originally posted by richg101 using an underpowered amplifier usually means you will end up pushing the amp too far and end up distorting what is going into the loudspeaker. this is called clipping. it is where the amp's output is not a smooth sine wave, but a square/sine (the peaks and troughs of the sinewave get cut short as the amp reaches its peak operating range. the clipping point you can cause mechanical damage to the loudspeaker workings as well as causing voice coil deformation/burnout.. the scratching sound you get after over doing it on a loudspeaker is the sound of the voicecoil no longer running smoothly within the motor structure, but instead rubbing against stuff like the top plate/magnet structure..

Interesting Now i want to do my homework on speakers and sound

Don't get hung up on the dampening factor. The number is largly used for marketing and has little effect on the amplifiers control of the speaker. Read the attached article if you are interested in learing about dampening factor.

http://www.prosoundweb.com/studyhal...jump.php?pdf=df

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Originally posted by SCUM Interesting Now i want to do my homework on speakers and sound

A good place to learn about audio basics. Its a lot to read but you can learn alot.

http://www.prosoundweb.com/studyhall/ab_index.php

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Originally posted by Allen Mueller A good place to learn about audio basics. Its a lot to read but you can learn alot. http://www.prosoundweb.com/studyhall/ab_index.php

Thanks
very helpful