I recently got a Fargen Blackbird 30 (BFDR-alike) head in a trade. I'm trying to decide if I want to leave the head as is and have an extension cab built or have a combo cab built to put the chassis in. Either way the cab will be approx. 19" X 19" X 10" and will have an oval opened back. The cab builder uses either Ponderosa pine or Baltic birch plywood. He says for an amp under 50 watts to go with the pine. Pine is more resonant and lighter, better for blues, roots rock, country - in other words not high gain amps. However pine is soft and I believe is easier to damage. Baltic birch plywood is stiff, hard, heavier, strong not as resonant and used more often with higher gain amp speaker cabs. I want the strength and durability of Baltic birch plywood because I don't want a soft pine cab that will dent very easily. However I wonder how much I'd be sacrificing in sound with the plywood.