I analyzed the broadband acoustic injection data:

run3:
11:07:00 - (JST), OMC area, 5000 cnt, white

At first, I checked the amplitude spectral densities of the following channels:

• K1:OMC-TRANS_DC_SUM_OUT_DQ
• K1:OMC-LSC_ERR_IN1_DQ   
• K1:PEM-MIC_OMC_BOOTH_OMC_Z_OUT_DQ
• K1:PEM-SEIS_OMC_GND_X_OUT_DQ
• K1:PEM-SEIS_OMC_GND_Y_OUT_DQ
• K1:PEM-SEIS_OMC_GND_Z_OUT_DQ
• K1:PEM-ACC_OMC_VACTABLE_OMC_Y_OUT_DQ

The coherences between these channels and the microphone channel were also plotted.
In all channels, the coherence was increased by the acoustic injection. 

The coherence between the MIC and the OMC trans DCPD was also found. It means there is not only non-linear coupling but also liner coupling.
Such behavior was not found in the OMC commissioning with the single-arm-lock, performed this summer.

I also checked the coherence between the OMC trans DCPD and the squired-time-series of the OMC error (length) signal.
There was also significant coherence.
Below 10Hz, the coherence was decreased by the acoustic injection. It was strange because the speaker used today can't make these frequency sounds.