Hello, I'm trying to flatten out the frequency response curve of my PB12 using the BFD DSP1124 PEQ. My FR curve* Given the volatile nature of my FR I would assume that at least a half dozen filters are required. However, I could also see using as many as 11 of the 12 filters to create something that resembles a flat curve. Freq(Hz) / Gain(dB) / Bandwidth (x/60th octave) 20 / -07 / 16 24 / -08 / 12 30 / -05 / 35 40 / +12 / 18 43 / -10 / 13 56 / -10 / 22 63 / +05 / 06 68 / -02 / 09 78 / +15 / 12 87 / -05 / 11 98 / +06 / 13 Given my FR curve, is 11 filters over kill? Thanks all! Note - I've determined that 100 Hz and 32 Hz sound most similar when the 100 Hz tone is played at -12 dB. I will eventually add a shelving filter to the mix to create the 12 dB gradual decline ( Thanks Wayne! ). *Configuration Details My HT room is approx 2800 ft^3 with a small open area to the kitchen and a hallway to the stairs at the rear of the room. AVR was configured with 80 Hz Crossover w/ all speakers set to small. Only front right, front left and subwoofer channels were used. Phase at 180 degrees. There's a significant decrease in SPL between around and above 80 Hz otherwise. SPL readings were taken via Radio Shack Analog SPLM and compensated for error accordingly. 10 second sine waves were played at 1/12 octave intervals.