Suggestions for augmenting my Omega SAM-HOs?

I'm looking for ideas on building one or two subwoofers to complement my Omegas (Super Alnico High Output Monitors). I had one, then two, Parts Express SUB-1200s that I gave away to a friend after not being satisfied with their sluggish sound. I will be listening to 100% music, no HT, in my room, which is 18x24 with 8' ceilings that rise to 12' in the center.

I bought plans from John Inlow for a 12" driver tapped horn, but I'm thinking that's not going to be what I really want. I'm not looking for DEEEP bass necessarily, rather a musical, quick, extension of what I already enjoy with my monitors. I've even considered the bucket sub distributed bass route. Not ruling out building the tapped horns in the future, but I feel as if they're not what I really want right now. I'm guessing two subwoofers @ 30-100 Hz is where I'd like help.

Any ideas?
 
I think I will experiment. Since I'm concerned about the sub keeping up with my main fast drivers, I'll try scaling down Inlow's TH, perhaps with a paper cone 8-incher. I doubt I can simply multiply everything by 2/3, so I'll wrassle with Hornresp.
 
Hi,
Try a MOREL UW 1258 in a 60 Liter sealed enclosure with the monitors and a good 50>W power amp (each driver).
Link
 

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