KRK or Yamaha Studio Monitors?

I'm not an engineer, but I have a studio production background and have hung with some great engineers over the years.

You are wise to go with Bi-amplified speakers. Remember, the speakers will always be at full volume so things like Power surges, or ground loop noise will always be amplified as if the speakers were at full volume even when your computer volume is turned down.

Don't pay much attention to the tech specs since the listed specs vary from manufacture and are highly dependent on OHM's, RMS signal ratio, even humidity.

The KRK's are reputed to be very nice, but a bit harsh for those that don't have a "Reference Monitor" ear. They are probably more technically accurate, but could be more difficult on your ears due to their very high transience.

The Yamaha's are easier on the ears (smoother sounding), but slightly less transient, so you may not hear tiny little pops and crackles as easily.

I really like my Event Project Studio 6's. These speakers produce a good balance for the money in my opinion.

If you are doing anything with surround or DVD mixing, get a subwoofer. Even the best near field Ref monitors can't really get a good low frequency that simulates a Home Theater system.

Also remember that near-field monitors will not throw accurate bass more than about 6-7 feet. Place them "near" your seat at about 70 degree angles from your listening vantage point. From the back of your edit suite, they will not sound the same as from the editing chair. If this is problem, consider mid-field or far-field monitors.

Hope this helps.