Raven's on my short list. Their internal crossover is selectable however its usually better to run the stereo pair full range for the best bass. Even with my 5 sub Swarm I still run mine full range. Similar 50 wpc tube amp too.
Then use the subs and their crossovers and EQ for any bass adjustments.
Then use the subs and their crossovers and EQ for any bass adjustments.