Figure 1
From: A low-frequency multiple-band sound insulator without blocking ventilation along a pipe
Experimental apparatus. (a) The model (left) and photo (right) of a MFCB. (b) Experimental apparatus for measuring the transmission loss induced by the MFCB. The distance between the adjacent microphones at the input end (or output end) is \({15}\;{\text{cm}}\) \({s}_{1}={s}_{2}=15\;\text{cm}\) and the distance between the microphone 2 (or 3) to the MFCB is 45 cm \({l}_{1}={l}_{2}=45\;\text{cm}\) (the figure is created using SOLIDWORKS 2016).
