If I were you, I'd do dual Kuda 18" boxes from DIY Sound Group, they are only $244 per box, then I'd put the HST-18 in both, and power them with either the XLS 2502, or the NX3000D in bridged 4ohms. This will, easily, beat the PB-16U and the JTR 2400, and cost you a LOT less. Plus, it will have a nice finished look, as they make great enclosures.
Another great option would be GSG Audio Mini Marty's, with the same drivers and amps.
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Last edited by blake18; 02-19-2020 at 11:26 PM.