QED support

Audio 40 - Q. Why are the conductors so small in your QED Audio 40 range?

Answer:

QED Audio 40 cables are designed primarily to have low capacitance, we have found that these sound the best for various technical reasons. The larger the conductors the more difficult it is to keep the capacitance low so, we have used the finest ones that we can, while remembering that the cable has to carry a certain amount of current.

For a line level interconnect the input impedance of the amplifier it is connected to is relatively high. This means that very little current is drawn by the input and therefore the cable carries very little current. Typically, the current drawn by an input is just 0.2 mA which means a 1m Audio 40 cable would drop just 44 uV (a 0.002 % loss). Because the impedance of the input is linear, this has no effect on the fidelity of the audio signal conveyed. High impedance inputs are susceptible to noise however, which is why we concentrate most of our engineering on protecting the signal voltage from outside influence; using a foil and large cross-section braided shield which is part of the return path for signal currents. This shield has a very large cross-section and it is what helps reduce the loop resistance of the cable design.