Equipment does not match

It could be equipment, but it's probably not. Could you please describe your room (dimensions, type of surfaces, rugs, etc.) and how you've positioned your loudspeakers and listening area.

Dereck, Did you mean the Rotel is 125W? The SP17 is a preamp and doesn't power the speakers per se. However, my research indicates that the RB 1080 produces 200W @ 8 ohms. In one review, the measurements indicated that the Burmester could be a tough speaker to drive. The AMT tweeter in the B25 is very revealing and many amplifiers can become hard sounding when driving difficult loads - the AMT will convey this in a heartbeat. There's also the possibility that what's bothering you is jitter from the source component.

There are many possibilities here. As mentioned above, we still need some info about your listening environment and what is is that you're unsatisfied with in your system (I know it can be hard to put into words sometimes).

I'm not disparaging the Rotel amp - it's a nice, solid component but I don't think it's in the same league as the SP17 and certainly not the B25s. More refined downstream components will reveal flaws in upstream components in most systems. Dick

I've heard modern AMT type tweeters recently in Goldenear Aon3 speakers off Rotel class gear compared to other speakers/tweeters a/b. The GOldenears were the most "polite" in teh high frequencies actually. Some will find that nice but some used to more oonventional tweeters like soft domes for example might miss some of the "bite" that other tweeters may be more prone to. Dynaudio Esotar tweeters are a good example I think.

Mapman, I wasn't referring to exaggerated high frequencies but the ability to transparently reproduce what is passed to them. Ive never heard them but, from everything I've read, the B25s are pretty transparent. Dick

Thank you all for the comments
the input impedance of the Rotel is 8 ohms while the B25s Nominal impedance is 4 ohms. Could this be an issue??
The room dimensions are 15.5 feet by 12 feet however i have a open passage at the entrance, my speaker facing the 15.5 feet length of the room next to the open passage. I have a marble floor and no rugs. Speakers are placed abt 5-7 inches away from the wall but the left speaker is just next to the open passage at the entrance.
Dick mentioned jitter i do have my home theater set-up in the same cabinet one side houses my B&W MT 30s with the base unit behind the right speaker in the corner, and the other side of the cabinet houses my AR/Rotel/Camb Audio