String your 4 banger BEAD or buy a 5 string with a low B.
Tune it standard (BEAD or BEADG). That's low enough.
Or tune down a full step and get that low A mwuahahaha!
Buying a chromatic tuner lets you tune to any note.
And here's those note positions you asked after based on a standard BEAD tuning:
Db is the 2nd fret B string.
F# is the 2nd fret E string.
B is the 2nd fret A string.
E is the 2nd fret D string.
Drop D is DADG, drop your E string 2 steps down. Normally you tune the 5th string E to the open A. For Drop D, tune the 7th fret E string to the open A and leave all other strings alone, that's Drop D tuning - Killing In The Name Of (Rage Against The Machine), Everlong (Foo Fighers), All Fired Up (Pat Benetar hawhawhaw)
And if you can't afford new strings, tune your 4-banger down to CGCF (Drop D a full step down). That will see you right on those tunings too (1st fret C string is Db)
If you are down tuning strings make sure they're heavy gauge strings, that the strings are still snug in the nut and if you get buzzing or the strings touching the fretboard, you may need the bass set up for low tunings. Or buy an ESP bass
Oh yeah, an octave pedal (down) and standard tunings, while not as hellish sounding, are fine for the bedroom. When I play this style I use standard tuning with distortion and octave down and with a little reverb sounds hellish enough for my tastes.
Hopefully thats of some use to you and allows you to worry more about learning and playing the songs you love, and less about the tunings chosen by internet tabbers
Thats the help.
Here's your answer:
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Cheers,
D_C