Bi-amping B&W Nautilus 802's?

your krell does not have enough power to drive these babies i aslo have a pair of 802N's i am driving them with the Levinson 335 (250 watts/ch 8 ohms)...sound is out of this world...but to tell u the truth i believe the levinson 336 (350 watts) would be better...bi-amping is good but not with the Krell 300i... the 802N's need lots of good clean power period to sound their best

My humble suggestion is to use a solid state amp. to drive the woofers and a low powered good quality tube amp. or tube monoblocks to drive the midrange and the tweeter. The solid state amp. does not need to be Krell and certainly not an integrated amp. You can use a good quality solid state amp. like Bryston or Parasound which can be obtained in the used market for $1000 or so. Invest your money in a good tube preamp and tube monoblocks. In this configuration, you will get the slam and tight bass of the solid state amp. and the sweetness and finesse of tubes on your midrange. Ideally, you should equalize the bass with an equalizer such as a Rane unit ( $700) and take measurements using a spectrum analyzer to ensure linearity of the frequency spectrum. The rane unit has knobs to adjust the overall bass level as well for optimal results. The sound that you get is better than with a 100 Mark Levinsons put together. I use this configuration with excellent results in driving my B&W 801s.

KAV-300i is not enough power for the N802's. If you want to Bi-amp you have to worry about matching the amp's sensitivity and gain. What i would do is to get a single powerful amp or maybe a pair of the same amp for Bi-amping if you wish. I heard the N802 with Krell FBP600c and it sounded stunning! These power hungry speakers just need a lot of juice to drive them.

Bi-amping is the way to go. The easiest way is if your preamp has two sets of pre-outs, and use one amp for each speaker. I would stay away from tube amps altogether for that speaker, but that is my prejudiced opinion. People that like tubes like distortion. Remember to keep the length of all interconnects the same to the amps to keep the gain the same. Also remember that one great amp will out perform two lesser amps used for bi-amping. If you want to get complicated, you could do something along the lines that Jrawwas above suggests, but he's making it sound a little too easy. And why add more to the chain than is necessary? If budget is no problem, I'd just get the most powerful Krell or Levinson I could and bi-wire. Good luck, and happy listening!