Originally Posted By: fredk
...If you look at a frequency response graph for a sealed vs ported design using the same driver and without and equalization/dsp you will immediately see the difference between the two designs. The seales driver will roll off more gently as frequency drops. The ported design will 'fall off a cliff' below port tuning.

From there, the driver design and the goals of the designer dictate which direction to go.

As a general rule, with a sealed sub, you trade off size for efficiency/power. This is the main reason sealed subs remain popular. Not everyone wants a large box in their livingroom.


Whoa... FINALLY!!! That's what I'm talking about. \:D I believe I can form a pretty solid foundation of education about sealed vs ported design characteristics based on that explanation alone! Why has it taken me so long for to find that tid bit of information? I'm not saying everyone's been hiding it away from me or anything of that nature, I've just never been able to find that sort of description anywhere!

Thanks for that. Ok so now on to my next real weakness in audio knowledge... It was said that the twin woofers in the EP800 are hooked up in 'parallel'... So does that mean that they each receive the roughly 800 watts put out by the amp? That's another thing that I've never truely understood, the laws of division and multiplication when it comes to electricity.

Say for instance an amp puts out 1000 watts and you hook one 8 ohm woofer up to it, now its driving that woofer at 1000 watts. So when you hook up another 8 ohm woofer up in 'parallel', they both get 1000 watts, at a 4 ohm load? Is that right? So in other words the two woofers in the EP800 are actually being driven harder than the one woofer in the EP600... Yes? I had been thinking that with the amp being an 800 watt amp, and there being two woofers to drive, that they both only got 400 watts a piece.

Hmmm... I may just grasp these concepts after all, provided I'm right in both of those assumptions. If not, then perhaps I'm a hopeless case! \:\(

My Stuff :

M80's
QS8's
VP150
EP800
Denon 4802
Emotiva XPA-3
Samsung BD-P3600
Sharp 65 Inch Aquos LCD