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Discussion Starter · #1 · (Edited)
Guys need some help on the setup of BFD.

My equipment as below:
Receiver Onkyo 805 (volume at -5db and LFE level at 0db).
RCA cable with 1/4" Mono plug to FBQ2496 left channel input. -10db input switch is on.
BFD Output using 1/4" Mono plug and RCA cable to ED A7s-650 subwoofer.

I had manually EQ the sub and the main channel with a flat freq response. I try to run REW freq sweep from different listening volume and the response curve is consistent.

When I try out some scene, I found out the input level is over saturated (red clip is on). Example, Iron Man and Kung Fu panda skidoosh scene. I try to turn down the sub level input to -6db and it still show clip.

I found out another problem when the peak is overloaded, it'll overflow to the second channel. I'm using Left channel for my sub tuning and when it hit the peak too high, not only the left channel input light up RED (clip), the right channel also show the input signal going up (sometime hitting RED). Anyone encounter this problem? I suspect it's the ground shield that is connected to -ve wire. Will try out some custom cable with -ve disconnected at RCA end. I don't think my unit having problem as I had 2 units and both show the same behaviour. Please note that my FBQ2496 firmware is ver 1.1. Any newer version than v1.1?

Scene to test out: Iron Man in the opening scene where Tony is ambush. This scene will show major clipping.
 

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Discussion Starter · #3 ·
Thanks for the reply. I do try to reduce the sub level to -8db but it still occasionally clip my input but the gain on subwoofer is very high, around 2-3 o'clock. Sorry to ask but why +4db would help? I thought normally it should be -10db.

Also, do you have any idea when the clip happen, why the signal will overflow to the second channel (right channel as I use left channel for sub EQ).
 

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Discussion Starter · #5 ·
OK. Will try out the +4db settings. My understanding is either +4db or -10db position will still show the same clip level.
 

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Discussion Starter · #9 ·
But setting -10db trim to Dolby TrueHD and DTS-MA will lower the sub output 10db lower than other channel. I had solved the driver clanking issue after getting the replacement driver.

FYI, I take the easy way out. I bought a AS-EQ1. One of the reason is I'm using dual sub and BFD doesn't had a build in delay for each channel so it's hard to integrate dual sub if it is not equal distance and same model of the sub. I still use BFD for my L,C,R speaker.
 
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