## 3 Results
### Subjective Results
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Parameters**} & \multicolumn{1}{c}{_EDT_} & \multicolumn{1}{c}{_T_**30**} & \multicolumn{1}{c}{_C_**80**} & \multicolumn{1}{c}{_D_**50**} & \multicolumn{1}{c}{_Ts_} & \multicolumn{1}{c}{_IACC_E} & \multicolumn{1}{c}{_IACC_L} & \multicolumn{1}{c}{_IACC_} \\ \hline \multicolumn{2}{c}{**Units**} & \multicolumn{1}{c}{**(s)**} & \multicolumn{1}{c}{**(s)**} & \multicolumn{1}{c}{**(dB)**} & \multicolumn{1}{c}{**(\%)**} & \multicolumn{1}{c}{**(s)**} & \multicolumn{1}{c}{**(-)**} & \multicolumn{1}{c}{**(-)**} & \multicolumn{1}{c}{**(-)**} \\ \hline \multirow{4}{*}{**JND**} & \multicolumn{3}{c}{**5\%**} & \multicolumn{1}{c}{**5\%**} & \multicolumn{1}{c}{**10\%**} & \multicolumn{1}{c}{**10\%**} & \multicolumn{1}{c}{**10\%**} & \multicolumn{1}{c}{**0.075**} & \multicolumn{1}{c}{**0.075**} & \multicolumn{1}{c}{**0.075**} \\  & \multicolumn{1}{c}{**A**} & \multicolumn{1}{c}{**\(\approx\) 0.05 s**} & \multicolumn{1}{c}{**A**} & \multicolumn{1}{c}{**\(\approx\) 0.05 s**} & \multicolumn{1}{c}{} & & & & \\ \hline \multirow{4}{*}{**S1—Head 1**} & Df-R & 2.51 & 2.71 & \(-\)2.3 & 22 & **0.180** & 0.436 & 0.117 & 0.223 \\  & **Dm-R** & 2.45 & 2.81 & \(-\)1.6 & 27 & 0.170 & 0.439 & 0.149 & 0.220 \\  & **Dr-R** & 2.51 & 2.70 & \(-\)1.7 & 24 & **0.170** & 0.448 & 0.104 & 0.196 \\  & **Dr-A** & **0.99** & 1.12 & 3.6 & **43** & 0.077 & 0.611 & 0.168 & 0.428 \\  & **Dr-A** & 0.93 & 1.10 & 4.7 & 54 & 0.067 & 0.065 & 0.232 & 0.466 \\  & **Dr-A** & **0.93** & 1.10 & 4.1 & **52** & 0.069 & 0.617 & 0.251 & 0.458 \\ \hline \multirow{4}{*}{**S1—Head 2**} & Df-R & 2.57 & 2.76 & \(-\)2.6 & 21 & 0.188 & 0.350 & 0.158 & 0.178 \\  & **Dm-R** & 2.58 & 2.70 & \(-\)2.9 & 20 & 0.191 & 0.367 & 0.125 & 0.188 \\  & **Dr-R** & 2.59 & 2.71 & \(-\)2.6 & 22 & 0.190 & 0.408 & 0.158 & 0.210 \\  & **Dr-A** & 1.03 & 1.08 & 3.1 & 43 & 0.078 & 0.478 & 0.153 & 0.349 \\  & **Dr-A** & 1.01 & 1.08 & 3.0 & 40 & 0.078 & 0.430 & 0.177 & 0.301 \\  & **Dr-A** & 0.99 & 1.06 & 3.6 & 43 & 0.074 & 0.545 & 0.140 & 0.407 \\ \hline \multirow{4}{*}{**S2—Head 1**} & Df-R & 2.73 & 2.73 & \(-\)2.8 & 23 & 0.196 & 0.408 & 0.120 & 0.190 \\  & **Dm-R** & 2.74 & 2.73 & \(-\)3.0 & 22 & 0.191 & 0.414 & 0.124 & 0.215 \\  & **Dr-R** & 2.75 & 2.75 & \(-\)2.9 & 23 & 0.196 & 0.358 & 0.127 & 0.172 \\  & **Dr-A** & 1.18 & 1.10 & 1.7 & 43 & 0.086 & 0.426 & 0.214 & 0.315 \\  & **Dr-A** & 1.10 & 1.08 & 1.6 & 42 & 0.083 & 0.486 & 0.192 & 0.351 \\  & **Dr-A** & 1.15 & 1.08 & 1.4 & 45 & 0.083 & 0.435 & 0.140 & 0.319 \\ \hline \multirow{4}{*}{**S2—Head 2**} & Df-R & **2.81** & 2.91 & \(-\)3.0 & 21 & 0.195 & 0.464 & 0.162 & 0.250 \\  & **Dr-R** & 2.68 & 2.94 & \(-\)3.0 & 20 & 0.196 & 0.437 & 0.190 & 0.257 \\ \cline{1-1}  & **Dr-R** & **2.67** & 2.93 & \(-\)3.4 & 19 & 0.198 & 0.450 & 0.193 & 0.264 \\ \cline{1-1}  & **Dr-A** & **1.04** & 1.13 & 2.9 & 46 & 0.078 & 0.546 & 0.225 & 0.393 \\ \cline{1-1}  & **Dr-A** & 1.09 & 1.13 & 2.8 & 48 & 0.077 & 0.535 & 0.260 & 0.419 \\ \cline{1-1}  & **Dr-A** & **0.99** & 1.12 & 3.1 & 47 & 0.074 & 0.595 & 0.295 & 0.457 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Objective acoustic parameters obtained at the head position for the compared pairs of configurations. The differences above the JND between Df and Dr values in the reflective (-R) and absorptive (-A) conditions have been highlighted in bold.