The X1 grandslamm is also a very easy load , it hardly drops in the bass ,with a lowest point at 20 khz of 3.2
In the event, the Wilson presents a relatively easy load to an amplifier (fig.6). It's not quite classifiable as an "8 ohm" loudspeaker, which is defined as having a minimum magnitude of 6.4 ohms, though it comes close. For example, in music's main power band (120Hz-10kHz), the loading does not fall below 6 ohms, and averages 7.3 ohms. The magnitude does drop from 5 ohms at 15kHz to 3.2 ohms at 20kHz, which will give rise to some "dulling" of the treble balance both with SE-type amplifiers and with others featuring a higher-than-usual output impedance (1-3 ohms, say). Conversely, the X-1's commendably uniform mid-band impedance means that it will remain neutrally balanced with many tube power amplifiers.
Fig.6 Wilson X-1/Grand SLAMM, Stereophile
In the event, the Wilson presents a relatively easy load to an amplifier (fig.6). It's not quite classifiable as an "8 ohm" loudspeaker, which is defined as having a minimum magnitude of 6.4 ohms, though it comes close. For example, in music's main power band (120Hz-10kHz), the loading does not fall below 6 ohms, and averages 7.3 ohms. The magnitude does drop from 5 ohms at 15kHz to 3.2 ohms at 20kHz, which will give rise to some "dulling" of the treble balance both with SE-type amplifiers and with others featuring a higher-than-usual output impedance (1-3 ohms, say). Conversely, the X-1's commendably uniform mid-band impedance means that it will remain neutrally balanced with many tube power amplifiers.
Fig.6 Wilson X-1/Grand SLAMM, Stereophile