15" woofer selection

Hi all
I want to upgrade my old 15" woofer in my 140 liters 2 way diy loudspeakers.
I'd like to have a good bass but I need to crossover at 3500 Hz.
I saw those speakers:
Dayton Audio DC3808
Monacor SPH-390TC (subwoofer)
MCM Audio 55-2974
MCM Audio 55-2963
Anybody knows this woofers?
Thank you

Simone
 
OK, lets assume you really need to cross over at 3K. Only off the shelf 15" woofer I know and frequenty use is the Eminence KL15CX-8. Truely flat on axis up to 4Khz. Designed to be that way. Way better than the curve Eminence posts for it. But it is pricey. If I had to do it, this is what I would use!
 
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"Shadow of The Colossus" build thread

Fane FC-153F01 is one of the highest going 15". it has copper shorting ring and costs under 200€

Is there 1" dome above or why it needs 3-3.5k xo?