[terry j]

oh dear, I don't think you helped me at all ha ha!! I assume the pictured sub is sealed, and if so my limited understanding at the moment says that the only variable that affects the Q then is enclosure volume. Now you said you changed the Q by other means...think my brain is about to explode..help!

A little off topic perhaps, but on this question of FR by either eq or LT, and now Q as well, say I had two different sealed subs, with exactly the same measured FR at the listening position, achieved either by eq or LT (to be answered more fully from above). Now, the only difference between the two happens to be the Q. Make one 0.5, and the other say 0.707. Back in the old days before our ridiculously easy job of getting a flat response, one method of achieving different FR's was of course choosing different Q values, eg one went lower but different roll offf etc etc.

Now, both have exactly the same FR, will they sound different?? Even tho the FR is the same, ie the quantity of the sound, does the Q still affect the quality??