Lively, fast & open sounding integrated under 3k?

Not to me they become invisible like the speakers have left the room, and the music just washes over you in a 3D sound stage, that you swear you can get up and walk into.
And I've built many, some very big ones over the last 30 years, even a self contained 120w-8ohm pure class-A water cooled one that could double down to 2ohm, that was two man lift, the size of a coffee table. 

Parasound stuff and the Halo have an incredibly clean midrange, they just do not have the high frequency extension that other amps do.

Parasound:
Frequency Response
2 Hz - 120 kHz, +0/-2 dB
20 Hz - 20 kHz, +0/-0.25 dB

Stereophile
was down by 3dB just below 100kHz!!

The sound was anything but mellow with the Spendors’ tweeters firing at ear level, but joined the Spendor’s crispness to the Hint 6’s wholeness and refinement. It almost felt as if I were leaning into the Trondheim Soloists’ performance of Tchaikovsky’s Serenade for Strings in C

Parasound never pushed the Quads’ ribbons into dangerous territory. Instead, music sounded brilliant and tangible, with a pulsating energy that made the strings of the Trondheim Soloists absolutely breathtaking. The sound was exhilarating. The Quads revealed the upper air of the Fitzgerald LP, with horns, hi-hat

Parasound was no exception. This combo was magical. The leading edges of voices, tenor saxophones, and drums reached out to caress my ears. A joyous sense of upper-treble air made all music exhilarating, transparent