The difference in volume between an 8Ω driver and a otherwise identical 4Ω version will be barely noticeable. With the 8Ω driver you will be able to add a second 8Ω box down the road. With most amps 4Ω will be all she wrote.
This is very true and something I wish I had done. We play at a small brewpub most Friday nights and I bought an Eden EX-112 specifically to be used there. I bought it in 4 ohm since I figured I would only ever have the one. After I got it, I liked it so much I had to order another one. Now I have two 4 ohm 112's.
Here's a shot of the one cab with my class D amp at the brewpub. I bought an Eden TN226 class D to drive the one EX-112. I put it up on a chair just to get it closer to my ears and give me storage space underneath. Amp weighs all of 4.7-lbs.:
Since my lighter weight amps won't handle a 2 ohm load, I have to use my big amp (WT500/800) to use both of them at once. It's a dual power block amp and I plug one into each of the two power channels. Both sides of the amp will handle a 4 ohm load and put out 400-watts into 4 ohms. So I can use them safely and it can get plenty loud.
If I had purchased them as 8 ohm cabs, I could drive both 112's with my class D amp or even my 400-watt back up amp (Eden Nemesis RS400). Instead of using my class D amp or my 19-lb. RS400, I have to use my 36-lb WT500/800 in its rack.
My 112's have a small footprint because they use a whizzer cone (cone within a cone) instead of a tweeter horn and my big amp hangs over the edge of them even when I stack them on their sides. Looks weird but sounds great!
And here's a shot of my T-shaped stack of two 112's using my big amp at a gig. In spite of the weird shape, this stack sounds absolutely great and is more than enough for most venues! I still pull out my DNS-410 for the larger of the medium-sized venues, large venues, outdoor venues, and festivals.
Current street price on the EX112's is $269. However, they are discontinued so once they sell out, they're gone.
