I have an Ashdown MK-500, Tech21 SansAmps, with 2 410T (4 x 10) cabs. These are 8ohm. I see that Ashdown came out with 4ohm versions. It seems that the 8ohm cab set up always feels overdriven. I ran 1 4x10 with a Mesa Boogie 18" at 4ohms for a bit and it felt better. i didnt have to turn up the input as much. Im sure the 18 made a difference. Am I getting the full power with the 8 ohm cabs?? I have played an Ampeg SVT-3 Pro through a Ampeg 4 ohm 410 cab and it felt like it had more power and the cab was pushing more air. I love my MK500, but also want a round warm sound of an Ampeg SVT-3 etc. Any suggestions??