I am about to make my first cabinets and I need to some clarification

[Chuck H]

But I do notice improved highs and lows with the cast frame speaker. It sounds Hi Fi to me, compared to stamped frame speakers.
So even though it weighs and costs much more, I would rather use the cast frame, and I think the difference is very noticeable.

Only speculating, but... It's possible that the cast frame provides for a straighter cone. Stamped frame speakers can suffer from small imperfections in the straightness of the frame. There was a particular run of early chinese V30's that suffered from cone cry because of crooked frames. Even small irregularities could cause a big difference in a cones ability to reproduce the full spectrum of the speakers range. Not to mention that a stamped frame may actually distort or vibrate sympathetically causing phase anamolies. Just thinking out loud.