SB2 Passive Summing Mixer Kit royalty and there is a little

and there is a little bit of SMD soldering

When all of this energy is focused on a narrower set of frequencies via a narrow Q setting

Why not put the bandwidth control on the front panel

EQP5 Optional Frequency Mods

SB2 Passive Summing Mixer Kit royalty and there is a little16 channels of passive, analog summing in one tiny box. The SB2 is an 8 16x2 passive summing mixer in a ultra compact format. Using minimal, completely passive circuitry, it sums 8 or 16 balanced line inputs down to a single set of stereo mic level outputs. Pair the SB2 with your favorite pair of mic preamps to add glue and color to your mixes. Features Ultra low cost and small footprint Accepts 8 or 16 balanced inputs DB 25 (D SUB) input connectors