"I wonder if replacing the 2235's on the mains with the 1400Nd's would be beneficial."
For the mains that could be a good move. You will need to A/B them to see if you prefer the 1400NdFor subs use the LE14H-3 or the 1500AL if you're tired of the 2235H.
"how does the 1400nd compare with the 2234/35?"
Overall it's a better transducer. If you want to use a 14" and need VLF use the LE14H-1 or LE14H-3. If you want to recreate the type of LF response popular in Japan use the 1400Nd. In simplest terms the 1400Nd is an LE14H-1 with a more powerful magnet (and a few other goodies which can be read about via the link 10 Watt Street posted). The more powerful magnet shifts the bandwidth up so the 1400Nd won't go as low as the LE14H-1 or LE14H-3. The extremely attractive thing about the LE14H-3 is that it has a rubber surround which doesn't require replacement due to rot. The LE14H-3 is used in the latest JBL 14" sub, the PS1400. Tip: If you build your own LE14H-3 sub, build the enclosure size as G.T. suggests for the 1400Nd; ~ 3.5 cubic feet and tune it around 28 - 30 Hz. I won't elaborate further since we are talking about current product. If you insist on using the 1400Nd as a subwoofer, use a high pass filter to protect it as it unloads below Fb or you run the risk of mechanical damage to the compliance, either that or simply operate it within it's excursion range which means don't beat it up with VLF. The LE14H-1, LE14H-3, and 1400Nd all have better LF resolution than the 2234 or 2235 at the expense of efficiency and mechanical power handling capability.
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Note - the PS1400 with the LE14H-3 also has a switchable subsonic high pass filter that can be used to help protect the transducer from excessive VLF excursion. I personally don't use any HP filter on my 14" subs but I don't drive them to their excursion limit either.
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"If you use multiple woofers, you won't have a problem for normal applications."
As G.T. states, this is a very good strategy. Mutual coupling will increase the output of a pair of closely spaced transducers wired in parallel and driven by a single amp by 6 dB in the VLF region. Scalability
"Since you are going to cut off the woofer in the 80 Hz range, the real issue is a reduction in actual sensitivity between 30 Hz and 80 Hz."
This harkens back to the halcyon days of the B212.Bandwidth limiting works for VLF transducers too
If you're modeling don't forget to add in your intended high pass filter and normalize the response taking note of the efficiency hit and the pleasant increase in VLF response.
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