Looked at some data on the 4435 & it seems very impressive.
When you say - "The pair of 2234Hs (2235H without mass ring) in parallel with one as the a helper woofer", do you mean using a similar crossover to that employed in the 4435?
I see that this crosses one over below 100Hz & then the other runs from above 100Hz. This set up would probably be beyond my capabilities to construct a passive crossover that would do this.
What if I ran 2 x 2234's in parrallel & ran them both full range up to the crossover point of 500Hz? The simplicity of this may outweigh the complexity of the additional components used by the 100Hz passive crossover? Just thinking out loud.
On the other hand, A single 2234 is probably all I need in terms of output & this would still be nearly 95db sensitivity, only about 2db down from the GPA 416 option, but gives me greater bass extension & a much smaller cabinet.
If I go with the 2234, they are going to be impossible to source here in Australia, so what's the best place to look for them in the States. I have a search saved in EBay & I know you have Craiglist & Canuck Audio Mart.....any other suggestions for sourcing these.
Many thanks,
John