Enhanced, high-conductivity version of the original.

After comparing the Endeavour-X to the Audioquest Indigo Blue, I came away with the feeling that the Endeavour-X was a little bass shy. I had also been asked about bi-wiring and this encouraged me to re-evaluate the original design.

Endeavour-X has a conductivity equivalent to 15 AWG wire. In theory that is more than enough for any cable under 5 m (15') long, but it is lower than most audiophile speaker cables. Perhaps this was the reason behind the Endeavour-X's thin bottom end.

Endeavour-X2 has twice the conductivity of Endeavour-X, equivalent to 12 AWG. Capacitance is doubled, but inductance is halved. It is bi-wire friendly.


Use the same Cat 5 plenum-rated data cable as before, but order twice as much. 8 m of cable required per 1 m pair.


Normal or bi-wire termination. Bananas or spades recommended.


click to enlarge diagram

Four cables are twisted together in a spiral. To build this it is recommended you make a cable loom. I made mine out of the lid of a plastic ice cream container, a twist tie, and two chopsticks held in a cross by rubber bands...

The fundamental sonic character is very similar to the Endeavour-X, as expected. Also as expected, the bass response is better. Most significant though is the improvements in presence - imaging was the strong point of the original Endeavour, but now the music begins to step out of the line between the speakers and take on a sense of depth.

Electrical data for Endeavour-X2 :

Measured inductance, uH/m Measured capacitance, pF/m Calculated resistance, ohms/m
0.23 134 0.010

By doubling the number of cables, the resistance is expected to halve. At the same time the inductance also halves, and the capacitance doubles. Electrically the cable behaves like two parallel lengths of Endeavour-X. The measurements compare favourably with some of the best high-end speaker cable out there.