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That is going to be person specific. I work around converting lines all day so what hurts your ears might not have any effect on mine.

Geez bloke, If your that mistrusting and that impatient you probably should have steered clear of a group buy, so as to keep your own over reactive nerves at rest. This is definitely not the first group buy Denim and/or SSA have run so i'm pretty sure he knows what he is doing. He can only pass on what dates he has been given by ZED which unfortunately isn't much since they are flat out. You have to realise it's not just your email Stephen has to answer but yours and the 200 others asking the same question, and every one he gets mean the longer it will be till you get your amp.

No question Sundown wins. Real parts versus cutting corners. AQ is overhyped.

The bridge that recently failed in MN did not go into resonance. You are referring to the Tacoma Narrows which failed in the 40's. That failed not at its first resonance but a higher resonance excited by high air flow. Nothing will go "out of control" unless you force it to, but you should use your subsonic to prevent overexcursion or really know what you are doing and understand your source, levels, and listen for stress. Impedance rise is generally caused by a box response and not a driver in free air.

My first question is, why do you think a speaker would be damaged by playing at it's Fs? The woofer doesn't self-destruct at Fs. Think of a weight at the end of a spring, with the spring being suspended vertically and the weight attached at the bottom of the spring. If you grab the weight, pull it down and then release it, the spring will rebound and continue oscillating up and down at a specific rate. In speaker terms, the mass of the soft parts would be the weight and the suspension would be the spring. At some specific frequency, the weight of the moving mass will be in balance with the compliance of the suspension and there will be a natural oscillation of the "weight on the spring" (the moving mass on the suspension). This is the Fs, and can be identified by a peak in the driver's impedance.

Buy one of each! Build a box for both using the suggested enclosure guidelines. Test each one to find the one you like best, keep it and sell the other one. Seriously, you cannot go wrong with either subwoofer. http://www.soundsolutionsaudio.com/store/products/SSA-Icon-12D2-%252b-Sundown-SAZ%252d1000D-Combo.html FTW!

The percentage of people making acoustical mods to their vehicles who end up doing SPL competitions is minuscule. Among those who do, a good number use their vehicle as a daily driver and are willing to make some concessions so that the daily experience is not excruciating. In any case, the OP has decided he wants a barrier to use in his car so the recommendations I made in this thread are based on the assumption that a grown man can be counted on to know what he wants. Blanket statements about sound deadening materials resulting in a net gain or loss of SPL need to be looked at very skeptically. I've seen a roughly equal distribution between "I applied product X and gained a dB or 2" and "I applied product X and lost a dB or 2". That's because every panel and every vehicle is different. Two things happen to influence the outcome when you apply a vibration damper to a panel - some sound energy is going to be converted to heat and the panel is going to be made somewhat less susceptible to distortion. Whichever mechanism dominates is going to influence the end result and I think determining the outcome ahead of time is well beyond most of our capabilities. I'm inclined to agree that any vibration damper that claims to enhance SPL is iffy at best. Take a look at the graph Dynamat uses to support this claim sometime when you need a laugh. It's absolutely wrong to think you can get more energy out of a system than you put into it. If the panel resonates at a useful frequency you will be better of than if it didn't - all else being equal but you still have to put more energy in than you get out as resonance. As has been pointed out above, the only modification that makes sense for pure SPL goals is reinforcement without vibration damping. Damping "wastes" energy as does panel deformation.

SNR (signal-to-noise ratio) is one of those relatively unimportant specifications. Any amp worth owning will have a sufficient enough SNR to not cause an audible difference. Though it is worth mentioning that not all SNR is the same. It's only "meaningful" for comparison if you know the parameters of the measurement. So two amp's SNR are not inherently comparable at a face value. They may not have "rated" SNR at equivalent power output, which would severely skew the comparison based on "rated" numbers. But regardless...as I said before, any amp worth owning will have sufficient SNR as to not cause an audible difference. So don't worry about it and focus instead on the things that do matter when selecting an amplifier. To be perfectly honest, I couldn't even tell you what the SNR is of my current amps, or any of my previous amps, as I don't even glance at that specification.

MLV doesn't lower resonance. You again are speaking without knowing about what you are talking about. Please stop e-gurgitating it is really frustrating to read your posts sometimes. You do a great service in helping people with box designs, but your ideas and knowledge base is regularly jacked and those noobs read it is as golden when it is far from. Really please stop.

Well today I was out at the show Anthony (secondskin) put together wich was a great awsome show. Anyhow we will get into that later. So i micd the hatch today now mind you I am feeding these subs very little power however i still managed a 140.1 all sealed up at 28 and yes 28 hrz. It stayed flat from 22 probably lower I didnt try and upward into the 30s I didnt burp any higher. Thats a pretty low peak and great score off 650 700watts and two tens ehh... new box comming later just wait comments welcome

your math is as bad as your reading. there are 48 1/4" pieces in 12", not 4. lol rofl... wow im goin to bed... ill just order from don...

No, although some solenoids have even higher values than that as they can run extreme tolerances and much better cooling. No, we use them for acoustics and noise control applications in very extreme industrial environments. About the most extreme application we have done was for a company that did some cut backs in the sonic fatigue dept and they no longer could run their 10k Gallon tank and the air valve system to test. So we came up with something smaller to test scaled parts for them.

AHAHAHA... love that. Google does all of my engineering No reason not to have a 22" version of it. I have the "6 spoke" 22" designed, but think for sake of tooling cost (considering the 22" in this style basket will never be as big a seller as the 18 or 15) we will simply go with the original design I had for that series. Something I havent quite seen before, but we should have a cast version to play with in the next two weeks. We will decide from there if it will be worth the tooling cost. Actually, no there is no secondary suspension to avoid coil rock in the pure SPL subs. So... I simply embraced it and did something else about it. Something that for SPL is all benefit. Problem with some things we do is that I dont want to give away the farm... or at least feel that if someone wants to figure out what is done, at least buy one...lol. We have spent lots of time testing and trying different things and have to figure if its worth mentioning exactly what is done and others picking up on it to use as well, vs not mentioning things and let them slowly pick up on it and then use it. We could have made significantly more motor force on the SMD than we have, but it simply isnt needed in a daily driver. We are currently testing the limits on just how much motor force is useful for SPL applications as well. We have some exceedingly high Gauss densities in SG2 and SG3 that arent seeing realistic gains any longer in SPL. It seems we are fairly well up into the point of diminishing returns with respect to motor force. Mentioning Gauss volumes really doesnt have any benefit to the consumer as its not a normal value, and Im sure a great many manufacturers dont use it either. We are currently testing with BL^2/Re figures of over 2800 which are almost a good order of magnitude better than most big daily subs. And that is by no means the limit of things either. No vent on the poles for the SPL versions. Although the SMD could have a 2" vent and still not loose force, it just takes too long to bore out a 2" hole in a 4" core that is almost 8" long. We cant find 4"X2" tube in the correct material in the US. Otherwise we would use that and save the material and weight. Drilling a 1.5" hole (biggest bit I have to run that deep on the 32" swing lathe) then using a boring bar to clean it out to 2" is just a waste of machine time. Customer just gets to lift an extra 3lbs of steel

It seems I have received quite a few emails since yesterday regarding the size of the motor and why things need to be so big... This motor uses magnets smaller than the current Mayhem motor (Which are 8.66") yet has more motor force than the original design for the motor utilizing a double stack of 11.25" magnets. We can make can make it out of neo (as was the motor design for an industrial client that was the first to use this topology from us). But, dealers have shown that larger sells and that is the specific market we are working with. SupergaussIII really shrinks things up and depending on how well this version is received by AA customers as well as one of our OE clients that is utilizing it for an SPL only sub, we may bring that to market as well. For our original client running SGI after their agreement was up and we moved them into SGII and SGIII they didnt feel the need to pay for an exclusivity contract as they realized their niche market simply wasnt going to copy the application (primarily because their competitors have no access to the products and installation in the first place).