Thanks for the responses. It turn out that the tweeters are not working properly.
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Nice little pair of speakers, unless you're using them to fill a large room, or with inadequate amplification, or your own personal preference is for fabric/silk or ribbon tweeters, or they're being asked to provide a levels of resolution and/or low frequency response and/or midrange smoothness beyond their capabilities, or your aim is to listen to large scale orchestral works, or you're not a fan of 600 series voicing.
Had a pair years ago they were pretty good and got good reviews at the time.
I replaced the larger B&W DM560's with these and was more than happy they were clean, grainless, lively, and transparent I would probably still have them today if my friends Junkie girlfriend had not decided to take them for a walk Downtown.
They are rated 4ohm which might present a problem. My Pioneer A400 had no issues driving them