some questions about my "new" bass cab

[Isaac]

No, I think you're wrong. The 412S is not ported, and I'm sure that the 610S and 612S are not. Not sure about the 415S.

The 410S is open back, as is the 2x12 cabinet that came with one of the Scepter clones. Not sealed, but not ported, either.

[EdBass]

No, I think you're wrong. The 412S is not ported, and I'm sure that the 610S and 612S are not. Not sure about the 415S.

The 410S is open back, as is the 2x12 cabinet that came with one of the Scepter clones. Not sealed, but not ported, either.

They warned me this could happen if I got off my meds. I even have a Scepter 4X12, nary a vent in sight!
But..I'm about 99% sure that I saw an angled baffle Sunn 6X10 and it had a 1"-1.5" horizontal port running across the bottom. I've never owned one, but I generally look pretty close at old Sunn cabs when I run across them.

[Isaac]

Might depend on the vintage. While I'm sure that the 610S is not ported, that doesn't mean the the 610L isn't. It's a later vintage, and I'm not as familiar with it.

[fatlizzard]

I had a 6-10 cab that I bought new with my model T in the early seventies and it was not ported!