I don't know how he pronounces it either, but both your way and another way, which ends in a 'k' sound are common. (see below)
I use the first one, and I was equivocating it to a 'cognac' sound.
DiSEqC (/ˈdaɪsɛk, daɪˈsɛksi/; short for Digital Satellite Equipment Control) is a special communication protocol for use between a satellite receiver and a device such as a multi-dish switch or a small[1] dish antenna rotor. DiSEqC was developed by European satellite provider Eutelsat, which now acts as the standards agency for the protocol
