This paper discusses the effect of regenerator positioning on the intensity of the thermoacoustic effect in a looped-tube traveling wave thermoacoustic engine (TAE). Traveling wave thermoacoustic engines work on the principle of the acoustic wave moving through the loop of the engine, across the regenerator, with the pressure and velocity curves in phase, amplifying the acoustic effect. Increasing the intensity of the effect, while keeping the energy input the same increases the efficiency of the TAE, and can be further applied in a thermoacoustic refrigeration system to increase the COP. The intensity of the effect in relation to the positioning of the regenerator, also called a stack in standing wave devices, is proven here to have an optimum positioning inside of the straight part of the loop. The increase in intensity under constant heat input proves an increase in efficiency. (C) 2015 Elsevier Ltd. All rights reserved.