Audio research m300

I love the sound that my ksa pumps out. I feel like I need more of it, but am reluctant to try for a newer fpb ,300, 400, or 600 as they don't get as good of reviews as my ksa. 

They have speaker terminals on the back for 8,4,2,&1 ohm loads. Thank you for the reply. 

My WADIA does have gain level settings. I did have a audio research ls 15 that I sold recently. I called thiel to pick their brains on the power amp that they used to power the thiel' back in the day. They told me that they used a Krell fpb 600 . I'm reluctant to purchase one of those beasts with out ever hearing one. My ksa has a nice tube sound with the good solid bass. 

i will give them a look. Thanks, Mark.