A lot more people turn down low mids, but think they don't - A lot of tone stacks (Fenders are notorious for this) scoop low mids a LOT when all the knobs are at noon. If you want "flat response" out of a Fender 3 band tone stack (there are slight variations, but they have similar characteristics) the mids need to be at 10, the treble on zero, and the bass just a bit above zero - that is the knob settings for flat. You can't actually boost mids on most Fender tone stacks, no matter what the knobs say.
Oh, and a jazz bass with both pickups dimed? That is mid scooped before the signal hits the amp - the pickup locations make that happen (though the dip is actually at a different frequency on every string).
A Stingray? Yeah, with the tone controls at center positions, there is a lot of mid scoop in that circuit.
Most bass rigs are, whether you realize it or not, scooped in the low mids. When folks here give you advice to "boost" mids to be heard, what they are really saying (though, again they don't know this) is "your rig has a lot of mid scoop, dial some of that back so you can be heard".