Todd,
Sorry my wording was ambiguous, but no, I don't own any Super Big Reds ( though I had weeky access to a pair back in the 80's ).
Yes, 1500hz is a reasonable crossover point.
I see the seller also has a TDM 244 ? unit for sale.
- That's a reasonable electronic crossover for this duty ( it's a variable 2-way with 24db LR slopes x 4 > if it's the same type I used to own ).
- It would be worth snagging if the price is right ( as would any number of those QSC or Crest > even the Altec amp ).