WMTMW - Double D'Appolito Config

Hello everyone. I need some help finding a project I have run across before but can't seem to track down now. It was a three way MWTWM in what I call a double D'Appolito configuration.

The MTM was positioned horizontal between the two Woofers. If I recall, there was either 10" or 12" woofers and the MTM was exactly the width of the woofer, just horizontal.

Any suggestions where I can find such a project? Has anyone build one or heard one?
 

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