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Well I actually don't have any money at all, let alone the money to break good subs...However, I have plenty of small 6 inch "woofers" as well as 3W amps that demonstrate these things very well (aka, computer speakers)
I too have heard all 3 forms of distortions and I'd have to agree with formica...nothing to worry about at all. Btw, do you have a link to that ABX website handy? If it's not handy, then I can do my own homework and find it myself.
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That better not be a blose 6 inch woofer