# FIR filter format - Brutefir - Volumio

I am trying to compensate for the high frequency droop of a TDA1543 based nos DAC. One straightforward method is described here.

Having played the resulting .wav, which I feel satisfied with, I am trying to replicate the results with Brutefir.

In essence it is a three tap filter:

1, -0.15, 0.026

The setup I am using is: Volumio + Brutefir plugin.

What I have attempted is to simply save the three numbers as .txt file and load them into Brutefir.

For some reason I am doing something wrong because there is no resulting music. Is Brutefir expecting an even number of taps? Is the format the problem?

• what's a "nos DAC"? Also, I'm pretty sure very few (if any) here know "Volumio" and "Brutefir". I guess that's software. What does it do? – Marcus Müller Nov 13 at 20:09

1, -0.15, 0.026, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,