actually capacitance per say is not a problem so long is it along with the inductance and resistance of the coaxial cable results in the correct impedance 75 ohms for AES EBU It is the impedance that matters not the capacitance Failing to match the impedance which would happen if you cut the capacitance without a corresponding increase in the inductance will result in poor performance Get the impedance right and the only limiting factor will be losses in the dielectric and increasing resistance due to skin effect as the frequency goes up Even cheap TV aerial coax has a performance vastly superior to plastic optical connects