@Splfanatic.. Thanx man!!!! Respect...!! (y)
And soundmagus is good, but you sure about 1% thd signal? coz if that can work, than it will help get some breath taking lows out of a sub...!!
And i agree to what you say about 308 or any other small sub, the knowledge lacks for the reason that people haven't heard these running on good amps, actual 400 RMS is NOT a joke, hook them up to a good mono D class amplifier, see what those babies do..!
But, like you said, if you wanna get real lows out of a sub, breath stopping ones, then you're gonna need 1000+ rms, solid RMS output, smooth output...!!
To be honest it takes alot of knowledge, effort and ca$h to do that...!
One needs to be aware of the dimensions and air vaccum of one's vehicle, capacity of electric equipment, appropriate amount of power supply, amplifiers, subs, same level components or speakers as per one's preference, and people do not realise this, but ofcourse Head Unit matters alot.. if its a 2 channel output, 4 channel, 4.1 channel, 5.1 channel surround, 7.1 channel surround, 1.5 v, 2.5v, 3v, 3.5v, 4v or the babies with 6v output..!
Anyhow, i wish i had money, but whoever gets these babies, will be a very happy man!