I haven't found the need for a Zobel network,even at 18 to 20 watts per channel the impedance curve seems pretty stable to me.
Possibly due to the non inductance resisters,internal cabling and upgrade caps presenting a better over all presentation.
They do seem to have a peek between 1khz. and 2khz. as dose most drivers in the extended to to full range variety but it doesn't seem to change with increasing volume.
Or maybe Rocky 500 notices it more in his particular room as he rocks up the volume knob.Hard to say but it dose make for awesome guitar riffs.The Lores are not ruler flat near the upper ranges,I knew this from the first audition,the ZU Essence is far flatter than the Lores but they have a huge peek in the very top end from 15K on up with bass remaining tight but not as prominent as the Lores.
The Lores are a fantastic speaker but they don't graph like the Bonneville salt flats.