Ccdoggy yes, I have to lower the gain going to my amp. I have my subwoofer "out" on my receiver set to the minimum setting (-20). I'm getting a low signal into my BFD (at most 2/3 LEDs lighting up for input levels while watching at a normally loud "movie" volume). Even with this, my IB sub is 6dB hot (measured roughly flat +/- 3dB from 15 Hz - equalized thru the BFD). I need to control the gain into the amp from the BFD. By looping I mean as you have described it. I need at a minimum the XLR "in"/RCA "out" channel to feed the amp a reduced signal. The looping part is purely for convenience. I currently use the 1/4" to RCA Parts Express cheepy adapters to go from my receiver (Sony DA-4ES) to the BFD and from the BFD into my NAD 2200 (I have had it since 1986 and works great, but has no gain control) bridged into mono driving 4 Tempest-Xs wired for a total of 4 ohms in a manifold Infinite Baffle. In a nutshell, I need to boost the level going into the BFD to get more LEDs lit up to minimize S/N and I need to lower the gain out of the BFD so my sub volume can be matched to my mains. If I can eliminate the adapters by looping thru the clean box, that would be great but not absolutely necessary. Do the 2 capacitors take care of both channels? or just the left and right sides of the RCA "in"/XLR "out"? Do I have to worry about doing anything if I only use the XLR "in"/RCA "out" side as mentioned above and as follows "The input coupling cap is the only real freq rolloff issue area because of its original value into the moderate input impedance forming a voltage divider. The output coupling cap is not a limiting freq factor due to its much larger value." I need to have the cleanbox act like the gain knob on a normal sub plate amp. In my scenario, my gain knob has to turn counterclocwise where most others turn their's clockwise
