i have 2 pr series bass cabs the pr 410 hlf and the pr 410h, they sound great together, the pr 115h is a 8 ohm and will not exactly match the out put of your svt 4 pro amp if you use both at the same time, if you hooke up both cans in mono you will be running it at about 6 ohm or so, the 115 h was made to go together with the pr 410 h, then both cabs went out of production when they starting making the pr410 hlf at 4 ohm, and they left the pr 810h, wich it was basically two pr 410 h in the same enclosure that you can can run mono at 4 ohm and stereo at 8 ohm, i ran my cabs before i switch the speakers of the 410 hlf with the speakers of another 410h making the cab at 8 ohm, with a carvin r 600 with no problems at all for 2 to 3 yrs with no problems at all, untill i left it at a show in another state show ( dont ask how, haha) thats when i bought an all tube amp and had to make the cabs either 4 or 8 ohms each, i think these cabs sound better than any mesa cab in my oppinion. to bad they are out of production, they are also heavy cabs, that is one of the reason why they went out of production and where also expensive to buld, i hope that helps.