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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
Post removed 
lambeau
26 posts
 
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.
martykl
3,578 posts
 
Lambeau,

Not just in theory, but - all other things being equal - in fact. There is one caveat: That group delay is a good measure of "sluggish" (I concede that this is a reasonably big "if").

For an interesting test of this question, find the subwoofer test results for the big triple ported SVS subs on Avtalk.com. This model is sold with removable plugs to fill the ports and allow user "tuning" of the subwoofer. The identical sub is tested with all ports open, then with one port plugged, then with 2 ports plugged, and finally with all 3 ports plugged (effectively sealed). Look at the "distortion @ SPL" results to check the higher SPL part of your question and the "group delay" results for the "sluggish" part.

Marty
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