The new mags are better then the originals. I currently own one. Plays loud, low and clean. Id bet the avalanche does the same, but...they are droping xbl, so you would need to buy one now before they are out. They are cheaper but I believe in the Mag. I dont think you would be disappointed with either.
Here is what someone posted on another forum I visit. This guy knows what he is talking about and is very picky about audio. He makes a lot of sense, and is not afraid to let his opinion be told...
"What's special about it, exactly, besides the price tag? They look like yet no Faraday ring noise-maker priced idiotically. Note that they don't even bother to list inductance, perhaps because the marketers behind this firm don't know what it is. Oddly for a sub in that price class, they also omit xmax and Vd, from which one could calculate xmax oneself. Perhaps those omissions are simply because their product would not withstand comparison to much cheaper stuff like the Dayton Titanic line...
Then again, I must confess I view Stereo Integrity as clowns. They lost any interest I might have ever had in their firm with that absurd speaker listed under "home theater", which is a rip-off of a decade-old design cobbled together by Zalytron to move some old Peerless (India) stock. In addition to not understanding the role of inductance (either in and of itself or in terms of modulation) they seem to not have a single person on their staff who can hear above 6kHz, judging by the performance of that widely-spaced four tweeter line. And if they can't hear the effects of 4"+ c-t-c tweeter spacing in an array, what makes anyone think they can hear what makes a woofer sound good or not?
I don't work in car audio, or audio at all. Not for a manufacturer, not for a shop, not for an installer, etc. Nor have I ever, unless you count getting a "sneak preview" of things from a few manufacturers - none since 1999 - and offering them my opinions. However, I have an abiding disgust for incompetence, and incompetence is demonstrated in spades by the design of that so-called line array.
I don't have any problem with expensive stuff, as long as there are compelling reasons for the higher price. In this woofer, Stereo Integrity does not offer a single reason to suspect that the spending the ~$350-$400 premium over a Peerless XLS, Dayton Titanic, or that very interesting looking (though to me it would be more interesting if they did 15" or larger versions...) Dayton Reference sub will be anything but flushing money down the drain.
By comparison, other premium-priced woofers (e.g. Adire Tumult/Brahma series, Aura, JBL W1xGTi series) do offer something that's clearly worth a premium, though to be honest I'd never use any of those superwoofers in a car. (I AM actively seeking either two W15GTi's or two Aura 1808/Seismic 8196's for my home audio system, which needs the long clean stroke more than a car does.)"