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Again you don't get it. Read the whole thread. 1) I never stated that they should build the box I did I used my box as an example. 2) The OP referenced 30Hz, you just built a 34Hz box which is far different. You also decided to bypass my example where I was using a .65cuft box which will have an even longer port. 3) The comment I was referring to was the "put it in a .8cuft GROSS box and tune to 30Hz. Please design that since you seem to be defending it. 4) Your little box design WILL have port noise with less than 250w, not something I am interested nor would the OP be if he is true to his request. 5) You didn't brace, nor double baffle unless you aren't counting that in your "internal" measurements.

The parametric goes down to 200Hz on the 8053 and the HP you can do at 200/250/315/400/500 which should "cover" you well enough to pull this off. Ideal, no but when you have one driver taking the brunt of the music you can easily accept that compromise. http://www.eclipse-web.com/us/manuals/manual_pdf/CD8053%281-1441A%29.pdf Page 94

It really depends on what you are trying to accomplish. If you're purely going for SPL, you have to be careful with how you use vibration damper. The simple fact is that vibration dampers turn vibrations, that can become sound, into heat, that can't. For SPL, you want the vehicle to contain pressure. Picture a balloon and a beer bottle. You can create a lot more internal pressure forcing air into the beer bottle than the balloon. The balloon will expand to accommodate the air. Both will explode at some point, but the beer bottle will resist a lot more pressure before it does. Now cover the balloon with Band-Aids. It'll resist a little more pressure than before, but still no where near the beer bottle. You want an SPL vehicle to be a beer bottle. You get there by bracing the panels that would otherwise distort in response to the pressure you are exposing them to. It really doesn't matter how thick the foil on a CLD is - it is going to be a poor stiffener for steel. It's also going to be converting vibration to heat. You can have it both ways, sort of. If you want to contain pressure but also want to eliminate resonance at lower volumes - when you care what the music sounds like, brace the panels in a way that divides each into several smaller panels. This is going to limit the amplitude of the resonance and each sub-panel will have a higher resonant frequency than the undivided panel did. A bit of CLD on each sub-panel will control that efficiently. Since the amplitude is limited by the bracing, less energy will be converted into an unmeasurable heat.

The OP asked for more of a SQ setup, "I selected a SA-8 as a Demo sub for my community. It happens that the majority have small cars, children, & want to save some trunk space shopping. also they listened to a wide genre not just rap. overall they want to hear nice sounding bass (quality more than output)... Can someone advised me ideas and experince using an SA-8 for SQ applications". So M5 posting about the quality of music they want is completely relevant, while your spl comments aren't, in this case.

Certainly they aren't the end-all objective measurement that completely defines a loudspeaker, no one has said they are. But they do absolutely allow you to ascertain certain aspects of the performance of a loudspeaker, much more useful than simply determining enclosure size. Really, the purpose of T/S parameters isn't at all to allow you to design an enclosure, as you suggested. They provide an objective description of the low frequency response characteristics of the driver (as well as some high frequency information), which in turn allows us to accurately predict how the driver will respond in a given enclosure in terms of frequency response, phase response, transient response, etc (among other things). Sure, people can use them to design an enclosure. But that's because of how useful T/S parameters are. They allow us to predict this information. But the actual intent of T/S parameters is to objectively describe the low frequency behavior/response of the loudspeaker, which has the good fortune of allowing us to make accurate predictions. Which are then useful for other things, such as enclosure design (for one example) Certainly someone should design their system for their own enjoyment, whatever that may be. No one can argue against that point. But don't think it's not possible to criticize a loudspeaker without hearing one if sufficient objective data is available. As Sean has pointed out; a loudspeaker can't do anything that defies the laws of physics. The pertinent aspects of it's performance can be obtained from proper objective measurements. Why is it that this entire discussion is being taken as "stepping on toes"? No one in this thread has made one discouraging remark against the drivers performance, yet many of the Blues supporters seem to be getting defensive over it. The only comments I've made directly about the speakers are 1) the drivers are expensive (self-evident from their listed prices), and 2) none of the information provided tells us anything about their actual performance (self-evident from the [lack of] information provided). Who's toes is that stepping on?

Boob trick ! Oooooh Yeaaaaah she has some....!!! Insane bass by the way !!!:fing34:

nice

28hz !? :trippy: :trippy:

First, get the sand out of your vagina. Second, all you've accomplished thus far is to demonstrate your ignorance and complete lack of understanding of the usefulness of objective measurements and the problems associated with subjective opinions. I'm sorry you don't understand this, but that's not my fault so there's no sense in getting pissy about it with me. How do you think most speakers on the market are designed? By one guy sitting around tossing together parts until he stumbles upon something that sounds subjectively "good" to himself? No, there is extensive computer simulations and direct objective measurements made before they are brought to market. But all those dumb objective measurements are useless, so why bother, right? The work of a couple guys you may have heard of, named Thiele and Small, form the basic set of parameters used to describe every loudspeaker produced and are used extensively to determine performance related to enclosure type and volume, among other things, without having to go through and build infinite alignments and testing each one individually. But objective measurements are useless, right? How lost we would be if it wasn't for objective measurements. And how lost you are because you don't understand this. And, actually, you are the one who just came here. So I suppose if you don't like it, you can go crawl back under your rock Show me where I stated an opinion of them. Find one sentence where I stated an opinion of their performance, other than saying they'd better perform well given their price tag. Beyond that, all I said is that I'd be far more interested in seeing some objective measurements rather than listening to he-said she-said subjective statements about how great they are as those opinions are of no actual value regardless of who they came from, and that the "proof" presented so far of how great they are isn't really any "proof" at all. Now, don't you feel stupid for getting all worked up and acting like an idiot over something I never said?