Several older "straight wire with gain" preamps provided switchable "loops" specifically for use with an EQ or outboard tone controls. In my opinion, this offered the best of both worlds.
If the recording was poor enough to need "help" in terms of correcting tonal balance or other deficiencies, the use of a simple bass or treble control might not be enough. As such, a more advanced processor or multi-band EQ would be more suitable. One could then completely remove said device from the circuit and switch it in as needed. This also added more flexibility due to the fact that you could add / change / upgrade the external processor as one felt the need without having to "dump" the preamp that may have otherwise been functioning perfectly. Sean
>
If the recording was poor enough to need "help" in terms of correcting tonal balance or other deficiencies, the use of a simple bass or treble control might not be enough. As such, a more advanced processor or multi-band EQ would be more suitable. One could then completely remove said device from the circuit and switch it in as needed. This also added more flexibility due to the fact that you could add / change / upgrade the external processor as one felt the need without having to "dump" the preamp that may have otherwise been functioning perfectly. Sean
>