+1
I always felt like that was the reason for the highpass filter (cap) on the bridge pickup. Takes the lows out and will somewhat protect a guitar amp. Never seen Ric make this claim but it makes logical sense.
That's right. I don't normally do this but I have tried it and it is cool. Being able to separately crunch the highs and have independent volume control for it with clear, less compressed lows is great if you're playing rock.
On a mono bass with the high pass cap, the bridge only position becomes a way to use a guitar or Bass VI like sound for a tune or part of a tune. It can be a lot of fun. It really can sound like you switched instruments for a solo or bridge or whatever.
You can do both of these things with a good EQ pedal (and a split signal for the latter) too but I like having it on the pickup switch. Also you're using the knobs of a Ric with the high pass (and without the pull switch for the high pass) as a low/high mixer all of the time anyway - which is not the same as having independent treble cut on each pickup - so it's less of a leap to think this way than it would be if you're used to other basses.