6000 Extension Speakers

My new 6000 has many great features over my EA-5 Organ. One thing it soes not have....the same sound quality. I have added more speakers to the EA-5, but without them the sounds are more realistic than what I get from the 6000. They are the same sampled sounds so it must be the delivery system in the 6000.
I would like to use external speakers that would improve the sound. I will be playing at home most of the time so amplification is not a factor.
Are there speakers available that can be adequately driven with the built in amplifiers? Recommendations please.

[This message has been edited by Fran Durham (edited 12-30-1999).]

I took Scott Yee's advice and invested in Roland KC300 speakers for my KN5000. It was an excellent decision. They are very easy to set up and the sound is absolutely clean. I used to have an EA5 and I doubt that you will ever get the sound quality with a keyboard that you get with the EA5 or the GA series organs, regardless of what external speakers you use.