I run 2 12W7's in ported boxes and I use an Orion 2500D mono amp and it works really good. if I was running 13W7's I would run 2 Orion 2500D amps, one for each sub because I could use more power for my 12W7's . It will be expensive {if you can afford 2 13W7's you can afford 2 big amps } your...