i want an 18" to compliment my SWR workingman's 15. its just a thought, i dont know i change my mind a lot. im getting a 6 string and when i tune down to D my 15 kind of bottoms out. im concerned that my 15 wont handle B. i have a GK 400rb head now. my thought was get a carvin DCM600 power amp and run it mono briged into an 18, with the GK still driving the 15. i was thinking a carvin 18 PA sub, cos i dont like theyre bass cabs. i love the PA cabs tho. 8 ohm, 800 watts (?) i was also thinking about an SWR big ben cab. i like there stuff. 8 ohm, 400 watts i think that the DCM600 delivers 400 watts into 8 ohms briged.