The program Speaker Workshop uses a sound card of a personal computer as the generator of white noise and the analyzer of a spectrum, allows to receive Z-characteristics at designing (virtual model of acoustic system) and to compare them with real in the real acoustic system.The measurements complex consist from: a personal computer, a measuring microphone with preamplifier, the device of switching for measurement of parameters, the buffer cascade of a linear input of a sound card reduces, the amplifier of capacity for acoustic systems.