You can build a custom resistor network to eq both. Use Metal Film 0.1% tolerance voltage dividers. Put the divider on the bass only which is where you need it anyway.
Other option is to use a passive Pre such as Axiom. This is a cheap easy way out.
The side effect of both of them is the impedance matching and change. It won't be an issue on your bass however when calculating the voltage divider, you will have to consider the source and destination impedance. That is why the passive pre is easier/better. Insert this between the Amp and pre for your sim.
Other option is to use a passive Pre such as Axiom. This is a cheap easy way out.
The side effect of both of them is the impedance matching and change. It won't be an issue on your bass however when calculating the voltage divider, you will have to consider the source and destination impedance. That is why the passive pre is easier/better. Insert this between the Amp and pre for your sim.