I can’t recall the model of McIntosh amp I demoed on, but know it was a two-channel. However, I found a Stereophile review of these McIntosh solid state mojo blocks. See: https://www.stereophile.com/content/mcintosh-mc501-monoblock-power-amplifier-measurements-0
The output impedance was no higher than 0.20 ohms from 20 Hz to 20 kHz, resulting in a frequency response variation of +/- 0.1 dB, regardless of which tap was used. So I really don’t think that it would have made a meaningful difference with the Focals assuming the amp I listened on was similar.
The output impedance was no higher than 0.20 ohms from 20 Hz to 20 kHz, resulting in a frequency response variation of +/- 0.1 dB, regardless of which tap was used. So I really don’t think that it would have made a meaningful difference with the Focals assuming the amp I listened on was similar.