In this case, for discussion sake, 1 Lii audio F15 vs 4 Betsy drivers per side, open baffle.

Currently trying to decide between the two.

What do you think?

I have done 4 per side, but not Betsy drivers. Never done 1 driver per side. I have only done 2way OB set-ups, full range driver(s) and helper woofer(s). I want to try a crossoverless system. Cant decide between 4 Betsys or a Lii F15. I can see pros and cons for each.

What's the impedance of the 4 drivers in parallel? That would be my concern if you have a low powered amp.

I did consider the possible comb filtering. On the other hand the problem with a single 15 is possible beaming, with such a large cone. Also, smaller cones are stiffer cones, all else equal. Dividing the power between 4 voice coils is not a bad thing either. So.....hmmm

I used, not four Betsy, but three Visaton in OB, touching on the baffle, close as I could get them.
Biggest trouble was the combing, as already mentioned.
At first you had not mentioned your amp or set up.  

My attempt worked OK in some ways and with great sound, except if I moved my head a few degrees.
The upper mids and highs would dance around if I even breathed.
I was trying to get more spread from a partial linear array.

Kind of like EdwardT cited, the sweet spot was smaller than my head and hard to find.

I went back to using woofers that petered out about where the Visaton came into its range AND just the one eight inch driver.


What are you trying to accomplish?