Ashdown rig setup-4ohm or 8ohm??

[alexofc69]

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??

 

[seanm]

Two 8 ohm cabs give you 4 ohms. You are getting full power from the amp.

In fact, you cannot run two 4 ohm cabs since that would be 2 ohms, less than the amp can safely run. If you ran two 4 ohm cabs, well you were lucky.

How do you set the EQ for the amp?