A lot of people have reported excellent results with them, but I'd be cautious, as Elizabeth suggested. Their ultra-low inductance is achieved at the expense of ultra-high capacitance, and if a Zobel network is not used that can cause some amplifiers to oscillate, and possibly fry. Although since you are using monoblock amps the relatively short cable lengths will reduce that possibility, since the total capacitance of the cable is proportional to length.
The extent to which the ultra-low inductance will make a difference (as opposed to being overkill) depends on the impedance of the speakers at high frequencies. The lower that impedance, the greater the likelihood of there being a difference (which is not to say that the difference will necessarily be for the better, subjectively). But as with most dynamic speakers (as opposed to electrostatics, for instance), I suspect that the impedance of your speakers rises considerably, rather than falls, at upper treble and ultrasonic frequencies.
The combination of ultra-low inductance and ultra-high capacitance also results in the cable having ultra-low
Characteristic Impedance, about which the Goertz website says as follows:
The characteristic impedance of the Goertz MI cables in the order of 2 to 4 ohms closely matches the impedance of loudspeakers. Almost all other speaker cables have characteristic impedance ranging from 50 to 200 ohms, a mismatch which causes distortion due to signal reflections. Impedance matching primarily improves the clarity of the highs and upper mid-range, but many users have also experienced improvements in the lower mid-range. The cause seems to be that signal reflections caused by impedance mismatch enter the feedback loop of many amplifiers and disturb their ability to reproduce faithfully even lower frequency signals.
IMO that makes no sense, at least in the context of a dynamic speaker. The reflection effects that it refers to will only occur at RF frequencies, and possibly to a small degree at ultrasonic frequencies. At those frequencies the impedance of a dynamic speaker will be much higher than the 4 or 8 ohm impedance it may have at audible frequencies, and at those frequencies the impedance of the speaker therefore will not come close to being a good match to the characteristic impedance of the cable. Very conceivably it could even be a worse match than would exist between the speaker impedance at those frequencies and the characteristic impedance of a cable having ordinary parameters.
Regards,
-- Al
