I owned Aerial 7B speakers, and drove them with a Bryston 4B SST, Bryston 14B SST, and VAC Phi 110/110. In all cases, I thought the speakers remained on the "bright" side and lacked sufficient bass to balance the top end.
While you say you like the Butler/Aerial combination, the Aerials have a pretty wild impedance curve. John Atkinson write in his measurements section of the Stereophile review:
These speakers are best driven by an amp that doubles power output as impedance is halved...so that the volume in the bass is equal to the volume in the mids and highs. Your Butler 2250 does not double power as impedance is halved.
Specifications:
Rated Power (all channels driven):
2 x 250 Watts RMS per channel @ 8 ohms
2 x 400 Watts RMS per channel @ 4 ohms
1 x 800 Watts RMS Bridged (Mono) @ 8 ohms
The result is that the amp produces somewhat louder volume in the highs than it does in the bass, which causes a tonal imbalance that emphasizes the highs.
IMO, your amp/speaker match is not optimal.
The tile and glass in your room exacerbates the problem, so as others have mentioned, some room treatment will be beneficial.
While you say you like the Butler/Aerial combination, the Aerials have a pretty wild impedance curve. John Atkinson write in his measurements section of the Stereophile review:
Its plot of impedance magnitude and phase against frequency (fig.1) revealed the 7B to be a moderately demanding load, with a nominal value in the midrange and bass closer to 4 ohms than the specified 6 ohms.
These speakers are best driven by an amp that doubles power output as impedance is halved...so that the volume in the bass is equal to the volume in the mids and highs. Your Butler 2250 does not double power as impedance is halved.
Specifications:
Rated Power (all channels driven):
2 x 250 Watts RMS per channel @ 8 ohms
2 x 400 Watts RMS per channel @ 4 ohms
1 x 800 Watts RMS Bridged (Mono) @ 8 ohms
The result is that the amp produces somewhat louder volume in the highs than it does in the bass, which causes a tonal imbalance that emphasizes the highs.
IMO, your amp/speaker match is not optimal.
The tile and glass in your room exacerbates the problem, so as others have mentioned, some room treatment will be beneficial.