I will check the RS180-8 driver the Amiga has. But I like the 4 ohm better. I also like the ND25 better than the DX25 tweeter. It's smoother. The DX25 has a very low xover, but the RS180 does not need that.
You really need a program for that. The impedance, response and design of the box come into play in somewhat a complex way. I use PSD-Lite which is free.
It would perhaps be wise to sacrifice a bit of that dispersion at over 10k for the ability to get a steep crossover down at around 1k with rs28f-4, also their sensitivity is almost identical.
Yes. The DX25 can produce SPL down to a 1.5 kHz, but it is not recommended perhaps due to distortion and maybe resonant impedance. I did look at the RST28F-4 and it is the top contender for a 2-way design. It is not straight forward. The RS180-4 almost begs for a 3-way design with an RS52AN (ZDT3.5). But that would require some distance for driver integration. Still thinking about this.
All that aside, I took a look at what can be done with an RS180-8 vs. an RS180-4. I like the RS180-4 a lot more than the RS180-8. It has lower compliance volume and can go down to 26-29 Hz with the COTS enclosure by Parts-Express cleanly. It fits like a globe and an incredible deal.
Again. I agree with @Ardacer that the new RST28F-4 is the way to go for a 2-way design. With all the compromises, that and switching to the RS180-4 with some slight crossover modifications would likely yield a small step over the Amiga and Core 2-way. I like that better than the TRS-80. And it may integrate and play better than even the ZDT3.5. Hell, I'm actually thinking of 3-way with RST28F-4 + TD20F-4!
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