The upper-left and upper-right panels illustrate the gains of the Gammatone filterbank in Room1 for the direct and reverb parts, respectively. The lower-left panel displays the ATF of the compensated direct sound contributed as the reverb part, and the lower-right panel shows the ATF of the total reproduced reverb signal. According to the lower-right panel, in the low frequencies only a marginal increase in decibels is added to the P1 and P2 cases as the reverberant sound. For the P3 case, approximately 5 dB, and for the P4 case, approximately 10 dB are added, indicating a greater potential for incorporating reverberation in these two cases.