It is not really omni but it may be fun.
Starting with a linoleum Pleiades Auratone 5C type speaker enclosure and mounting 2 5in drive units back to back as in previous post.
So one drive unit on front side, one on back. But both drive units fed in phase.
Presure builds up and releases. Linoleum would expand like a ballon and radiate low frequencies rather efficiently due to a relatively large vibrating area. Perhaps similarly to mounting one drive unit but more pronounced presure variation effect.
Two 4Ω drive units in series would have 8Ω impedance.
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