Getting overtone in a pair of bookshelf speaker.

Try moving them out 3-4 feet from rear wall and a foot or two from sides with each tweeter firing 2-3 feet to the side of your main listening position, not directly at you. Make sure tweeters are near ear level and speakers are firmly supported on stands. Avoid early reflections from walls and whatever the speakers might be sitting on. Not a problem generally with proper speaker stands.

Jim, the guys are dead right on this one.

give'em 4...500 hours of break-in or whatever. if they don't sound good out of the box it will not improve. break-in only helps to ones sounding good to sound softer with less of edginess that is usually present in the speaker. tonal balance issue implies to poor crossover design.
for cheap speakers in general is the best to go active. M-Audio audiophile active bookshelves have the tonal balance adjustable the way you like.

Wow, got a lot of flak on this one. It is not the end of the world; I will just sell them if I dislike them or made a mistake.

To Mapman: will follow your prescription and see what happens. I am not sure about the usefulness of aiming the tweeters 2-3 ft to the side, but I will that a shot.

To Rrog, I owned a pair of GM Europas about 8 years ago. Very nice speaker, but was a bit bass shy; They also are expensive used and heavy to ship.( there is a pair on AG now or was) As far as Von Schweikert VR-1, there was a pair on AG about a month ago, but could not come to agreement on price with buyer.I am still not convinced that this is the best bookshelf value out there. BTW, I bought the Marimbas from an internet dealer who may have not have an official return policy, and he does not have another speaker in his inventory that interested me in my price range

MoFI, the Marimbas have about 7 hours on them, so I am far from Nirvana. 400-500 hours seems alot as recommended by Marak

I do appreciate everybody's commments and advice, but there are many speakers out there to consider as an alternative to my main speakers. Totem's Dreamcatcher; Rainmaker, and even the short floorstanders like the Arro and Stff models are viable choices.

The Epos 5i and 12i though discontinued seemed to be favored by Bob Reina of Stereophile. I believe I auditioned the original M-12 about 7 years ago, and was impressed by "how right they sounded" I don't have the opportunity of auditioning that many speakers in Honolulu because the 2 only high end dealers display 2K and above speakers because every turn must count to stay in business.

As MOFI noted there are many choices out there; manybe I should have spent a bit more money and bought the freakin VR-1. Nevertheless, I am having fun.

"To Mapman: will follow your prescription and see what happens. I am not sure about the usefulness of aiming the tweeters 2-3 ft to the side, but I will that a shot. "

The main thing is to at least try having them not fire directly at you, but to either side of "the sweet spot" where you listen, possibly with speakers far apart and out from rear wall and closer to side walls. That will affect the high end and upper mids maybe for the better. Then play with teh placement away from the walls so no early reflections and to get the soundstage and imaging tuned in. Asymmetrical placement may even be OK. Listen for "holography" in the sound with this kind of placement, sound seemingly disassociated with the actual location of the speakers. You will be relying on reflected sound heavily rather than direct sound in a more typical nearfield listening type setup. Its all good (when it works)!

This are some things I have found useful in similar situations with small monitors in smaller rooms. Its easy and cheap to tweak speaker placement and I would always attempt to get a handle on that before jumping ship on any particular pair of speakers. There are many other tweaks that might be worth a try also once the speaker placement issue is addressed.