subwoofer question


hi everyone, i have a chance to buy 2 m&k mx-150thx(mark I) subs for $900 shipped.
first off is this a good deal or am i over paying.
next, because these subs are old (10-15 years), can they compete with the new subs which use better technology.
i only use my system for home theater.
my room is 14x12.
will these subs be great for my room or should i get one really great "USED" sub like a jl fathom, or velodyne dd series, svs, etc.

thanks so much
nineballg

In the price range that you are looking at, I would go with a small driver sub that doesn't necessarily go really low. I think you will end up rolling it off at 30 hz anyway to take the room out of the equation. I would much much rather have a to little bass than to much bass.
Post removed 
Bob,

I prefer to treat the use of the word "faster" as merely a semantic issue, albeit a widespread one. An underdamped woofer settles less quickly ("slower")and produces a bass character that people (I think) call "slow". I suspect that people intuitively use the word because they correctly relate the quality in question - whatever you choose to call it - with inertia/momentum problems. The false, though understandable, leap is to the causal connection between increased mass and increased momentum/inertia. So, I accept the idea of "fast" bass, I just don't equate it to small drivers.

I might personally choose a different word in describing the phenomenon, but it seems that "fast" bass is usually (although I'm sure not always) understood to mean tight bass. So why fight it?

Marty
Post removed 
So in theory

A ported sub will give higher spl levels and lower frequency response but may appear sluggish.

A sealed sub may appear quicker but have lower spl levels and not as low frequency response.