Depends on which FPB model you have, sensitivity on the FPB's is on the low side. Also depends on your source output and speaker sensitivity. I use a Bent audio passive transformer volume control with my sony xa777es player. My speakers are VMPS Super tower/R's, 91db and 4ohm. My amp is Krell ksa-250, 2.2 volts for full output. Interconnects are Harmonic Tech. truth-links and one meter from source to passive, two meter from passive to amp. Speaker cables are 8 ft. Acoustic Zen Hologram. Input Impedance on my krell is 47k. This is a great sounding setup and volume level great at 12 O'clock and 2-3 O'clock is very loud in my room, room is 26 ft by 22 ft. Hope this helps a little.
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