Surround Speaker Question

I would disagree with that statement... If you go back to the days of Pro-Logic, yes, surrounds were limited to a point where you could use very different speakers than your L/C/R's. Today, the high resolution formats and the amount of information used in the surrounds, you'll head the different right away. Use timbre matched surrounds to your fronts (best would of course to have all identical speakers, but that's not always practical)

Thank you all very much. I am using a Krell HTS preamp, Sherbourn Power, Faroudja DVD/CD, and Martin Logan Source speakers for main

As usual, there are going to be some that read to much into it. The OP wants a suggestion on surrounds without giving any info on the rest of his speakers.
Myself, I feel any good dynamic speaker that will convey background info will do in a normal HT setup.
If he was so critical, he would already know to buy the same brand and model as his fronts.

I must add that the BEST surround speaker would be the same speaker as the fronts.
But I gather that the op is looking for an alternative speaker that will work well.

I think th best surrounds are from the same manufacturer as your fronts. That way they are similarly voiced .