Some speaker cables produce lower/higher volume?

The electrical properties of a cable can also affect the performance; of an amp i.e. capacitance and inductance.

E.g naim amplifiers really like low capitance speaker cables and actually sound worse when used with higher capacitance cables. Naim also recommends a minimum and maximum length of cable to be used. Naim own speaker cables are among the lowest capacitance cables out there.

Also the inductance may also have a detrimental effect, but to a lessor degree.

High capacitance cables can also act as a filter that also affects the sound and possibly an apparent volume change.