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The reason I am asking is I want to know if the input level affects how loud the sub will play during a movie as I increase the master volume on the receiver. Does the bfd restrict the maximum db that my subs will produce in room? For example, I watched a scene from a movie and with the subs only playing I got 108db on my spl at -8. When I increased the receiver's volume to -6 I still got only 108db on the spl, shouldn't it have increased?
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The BFD has a maximum input level (when using the -10dBV switch setting) of ~1.26 volts. The BFD is a unity gain device and so the output will track to the same maximum 1.26 volts. (Cut filters will reduce the output at their respective frequencies and gain filters will still be constrained by the 1.26 volts limit).
That voltage of 1.26 volts is consistent with most retail equipment and will drive most subs to maximum outputs.
If you feed the BFD more than the maximum input level, it will clip and the RED LED's will indicate so. You have reached the end of the ability to increase the output level of the BFD beyond that point.
If the RED LED's aren't indicating clipping, then you still have 'travel' before reaching the limit. If your sub does not increase its SPL level when in this normal operating range of the BFD, then it's because you've reached the limit of your subwoofer and not the BFD. The sub is compressing.
brucek