Velodyne makes excellent subs.
As a rule, mixing dissimilar subs is not a good idea.
They are bound to have different FR curves and therefore will reinforce certain frequencies more than others.
Don't pay much attention as to the method the sub uses to achieve its mission. (Sealed, ported, etc.)
Be sure to get some sort of warranty on the used sub, if you can. Subs live a tough life, in these DVD days.
As a rule, mixing dissimilar subs is not a good idea.
They are bound to have different FR curves and therefore will reinforce certain frequencies more than others.
Don't pay much attention as to the method the sub uses to achieve its mission. (Sealed, ported, etc.)
Be sure to get some sort of warranty on the used sub, if you can. Subs live a tough life, in these DVD days.