 Do the same thing on TXTOUT (U_2) to see filtered output.  You can see the output of FIR filter in which we input an unit impulse.
(i.e. impulse response) That should be the same as FIR filter's coefficients.
 Next, left click on FFTMON (U_4) to select another FFT and right click
to choose "Open a Monitor".  Then you will see the spectrum of the impulse response. It's begin to decrease
from 1kHz and goes to -80dB. 
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