The 800BMF is a full version of the 800BM preamp; it borrows the EQ section of the famous GK800RB amplifier and squeezes it into an onboard preamp this time with a Contour switch for an increase in sound options.
The 800BMF differs from the 800BM by having an Active Blend and Master Volume control, making this a fully featured preamp.(not suitable for active/passive operation)
This tone stack has some serious high-frequency power and a very deep bottom end, just like the amplifier it’s based on, allowing you to explore different tones directly from your instrument.
The Hi-mid and Treble controls are highly interactive; the same goes for the Lo-Mid and Bass controls and the overall sound is always very “cut through” and clear sounding.
For a stripped-down version of the 800BMF, check the 800BM.
Treble: Boost and cut around 4khz
Hi- Mid: Boost and cut at around 1khz
Bass: Boost and cut at around 60Hz
Lo- Mid: Boost and cut at around 250Hz
Contour switch: EQ pre-shape (V)
Active Balance board: active blend control + master volume