A 14" speaker...I don't think I've even heard of a 14" speaker before? 12"...yes....15"...yes...but a 14"?
There are 13,5" - speakers I have seen in old cabs from Solton / Craaft, a german brand. It was a 2 x 13,5" - cab.
We discussed a new speaker of this size, but I can't remember the name of the brand. It was woofer that some members of my german bassmen - community wanted to check out because of its size, power and TS - parameter. Two of them should be able to outrun a modern 215", if mounted in a good enclosure.
For myself, I started in profi business with two huge towers, each a 215" (TL 606) and a replica of the Music Man 212 - cabs., fired up with a GK 800 RB each. Heavy rig, heavy times, it had to "fight" together with two gitarrists, each of them with two Marshall Full Stacks.
Later I mixed a SWR Redhead with a custon built, sealed 410". The 410" gave the rig the mids I was missing from my SWR Redhead.
As the Redhead went up in smoke during a tour, I purchased a Marshall MB 4410 - Combo. I had to get a new amp fast, it was the only available in the whole town. This massive 410" - Combo got paired with the sealed 410" during that tour, than with a SWR 212" Workingman I purchased for cheap. It soundet that brilliant, I recommendet a long time the Marshall MB 450 h for beginners and players with small budget. A complete underrated amp.