Could someone please tell me the difference between the two designs? and what benefits these would give me if i built them.
I will be building some this weekend (week)
The low knee is around 70 hz. It's already about 5 db down at 50 hz. Add a 60 hz highpass filter and it will be 5 db down at 60 hz.
Add 3 more (stack of 4) and it will be 12 db louder and it will go about 2 hz lower.
Like I said, useless for any type of modern music. Very loud but it's not a subwoofer. I'd call it a midbass horn.
The 1850 horn was ment to be used in stacks of four. The 186 horn sounds "warmer" and is more suited to be used with less cabinets. High pass at 50 Hz for a single 1850 horn, 40 - 45 Hz for a stack of four (24 dB/octave or more), around 45 Hz for a single 186 horn.
For dubstep you probably would miss that lower "umph", for most house music it will be sufficient.
With four 1850 horns and correct drivers, you'll have a "long throw" indoor and outdoor setup.
How many layers (laminates) does that ply have?