bfd and rew question

[mrsnapper]

I have a strange thing happening. I set up rew and the bfd and did some measurments and just tried to get familiar with the tools. Things seemed to be working out. Then I wanted to experiment and this is what I did. I took the bfd out of the loop. I wanted to start by using my avr's audyssey program as a start and use rew to see what it's doing. It didnt look to bad actually. Then I was going to fine tune with the bfd. So I put the bfd back in and pressed the in/out button(flashing) and assumed I was in bypass mode, straight in-out. I then took another measurement to see if my graphs changed and they did, a lot. But no filters are being applied. Why would this be? My gain messed up maybe, or maybe I didnt calibrate the sound card correctly?

Another odd thing is when I do a measurement and get a graph and then generate a waterfall of it the peaks on each are different? They look similar but the peaks line up at different freq.


Souncard- rme ff800
avr-onkyo 805
bfd 1124p
rs digital spl meter
ecm8000

[brucek]

I wanted to start by using my avr's audyssey program as a start and use rew to see what it's doing...................Then I was going to fine tune with the bfd

Yep, many people with auto eq do this...

So I put the bfd back in and pressed the in/out button(flashing) and assumed I was in bypass mode, straight in-out. I then took another measurement to see if my graphs changed and they did, a lot. But no filters are being applied. Why would this be?

Green LED on=filters engaged.
Green LED off=filters disengaged.
Green LED flashing=Filters disengaged, with VU meters displaying input level rather than output level.

With the in/out LED flashing or off, the BFD offers unity gain. There would be no modification to the signal or its level....

Another odd thing is when I do a measurement and get a graph and then generate a waterfall of it the peaks on each are different? They look similar but the peaks line up at different freq.

Move the slider to a single slice of 1. It will be the same as the frequency response graph. The peaks will line up exactly the same..

brucek