Equipment does not match

Thanks for the response Dick, i listen to Jazz and slow rock and a bit of country. I think the problem is the Audio research preamp is 125w while the speakers are 200W hence i am not able to power it up beyond a certain point. I use flac files on the cambridge audio to listen to music i don't have a CD player
thanks for your help!!

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

i am still learning about this stuff, so the specs of the equipment might help;
B25s Description: Three-way, reflex-loaded, floorstanding loudspeaker. Drive-units: 30mmx40mm Air Motion Transformer tweeter, 5.25" (130mm) Kevlar-cone midrange unit, 9.1" by 6.5" (232mm by 165mm) air-dried paper-cone woofer. Crossover frequencies: 180Hz (third-order Butterworth), 2.7kHz (second-order). Frequency response: 35Hz–45kHz, ±3dB. Nominal impedance: 4 ohms. Sensitivity: 88dB/2.83V/m. Recommended amplification: 200W. Maximum SPL output per pair: not given.

Pre amp SP17 / 17L Specifications:
FREQUENCY RESPONSE:
Line: +0-1dB, 0.6Hz to 80kHz at rated output. -3dB points below 0.3Hz and above 120KHz.
Phono: +/-0.3dB of RIAA, 10 Hz to 20KHz
DISTORTION: Less than .005% at 2V RMS output.
GAIN: Main output line: 11.1dB Processor: 0dB.
Phono: 58dB at 1 KHz.
Record output, line: 0dB. Phono: 47dB.
INPUT IMPEDANCE: 60K ohms line, 47K ohms Phono, (0.7 to 7mV High output cartridge recommended). Inputs (6): phono, CD, tuner, video, aux, processor. Model SP17L has no phono input.
OUTPUT IMPEDANCE: 210 ohms Single Ended main; 20K ohms minimum load and 1000 pF maximum capacitance. Outputs (3): 2 main, 1 record (Single Ended RCA connectors). Record output 60K ohms minimum load and 100pf maximum capacitance.
OUTPUT POLARITY: Non inverting.
MAXIMUM INPUT
Line: 9V RMS.
Phono: 40mV RMS 1KHz, 100mV RMS 10KHz.
RATED OUTPUTS: 2V RMS into 100K load. (Maximum output 15V RMS at 1% THD at 1kHz.)
POWER SUPPLIES: Electronically regulated low and high voltage supplies. Automatic 25 sec. warm-up/brown-out mute. Line regulation better than .01%.
NOISE:
Line: 12uV RMS IHF weighted at main output with volume low (104dB below 2V RMS output).
Phono: 0.3uV RMS IHF weighted equivalent input noise, shorted input (76dB below 2mVRMS 1KHz input).
TUBE COMPLEMENT: (2)-6H30 dual triodes.
POWER REQUIREMENTS:100-135VAC 60Hz (200-270VAC 50/60Hz) 39 watts.
Power amp
The RB-1080 rests close to the pinnacle of Rotel's two channel power amplifier designs. Power output of 200 watts per channel (20 Hz to 20 kHz @ 0.03% THD into 8 ohms) is extraordinary. The Rotel-made toroidal transformer feeds separate power supplies for each channel, each with its own rectifiers, voltage regulators, and capacitor banks. Damping factor, at 1,000, shows this amplifier's unparalleled ability to lock onto the most difficult speakers to precisely control diaphragm motion and give you the best sound quality. Switchable balanced (XLR) and unbalanced (RCA) inputs provide flexible system interface. Front panel heat sinks add a strikingly dramatic look and serve a functional purpose by enhancing heat dissipation even in cramped environments. And a separate input and output for 12 volt "trigger" signals makes this amplifier well suited for fully integrated systems with total remote control capability.

Thank you all for the very positive feedback, appreciate all your comments. i have already spent quite a bit on my audio kit so wanted to learn about options to improve sound without going in for more expensive kit.
I will try the following
1. move the speakers further away from the wall
2. get a couple of rugs placed in front of the speakers
3. acoustic panels
4. the final option is to upgrade my power amp (Rotel RB 1080)which seems to be the weakest link.

oscoeiii/Almarg/Dick

Thanks i will move the speakers around over the weekend and let you guys know.
With regards to Dicks question what sound did i envision, i have a pair of B&W XT8s that i use as a backup so with the same setup i get a good crisp sound , when i purchased the B25s i expected the results to be infinitely better (more natural sound with a good deep base and clear treble)
However as many of you have pointed out i have not optimized the placement of the B25s so hopefully with some experimentation should get there.
The 8ohms rotel power amp paired with the 4ohms B25s still bothers me but will get to that in the next stage thanks all!!

Thanks Dick will let you know how the experimentation with the placement of speakers goes!!

Hello all been away for a while busy with work just got a Job 225 paired with my audio research sp17 and Burmester B25 speakers sounds really good