Lower notes don't cause inharmonicity as much as heavier strings do. And they're not producing less harmonic content -- they're actually producing more, and it sounds bad and that's what the problem is. Positions of the frets don't have any bearing on the issue.
It sounds like I'm contradicting myself, but if you were to use longer scales on the lowest strings you can get away with lighter gauges to mitigate some of the problem. This is a known issue among piano builders, and there are some
pretty outrageous designs to try to incorporate longer, lighter strings to mitigate inharmonicity.
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This piano is 15 foot (4.5m) tall. You can't see the keyboard but it's on the wooden plank behind the stool, on the scaffold. The big vertical sheet of wood is the soundboard.
I get what you are saying about pianos. We have 3 grands an 2 upright pianos at work.
A Yamaha upright sounds like trash compared to a Yamaha grand.
Maybe I didn’t express myself well enough when referring to harmonic content.
I was referring to harmonics created between 2 different instruments or voices.
Not about the harmonics of a note on an instrument.
As an example I play a C#on a bass and a piano is playing right hand only C# chord.
The closer I play that C# in tune the more sympathetic harmonic content will propagate between the 2 instruments.
The further away that C# is from Equal Temperament the less sympathetic harmonic content will propagate between the same 2 instruments.
(I am not going down the harmonic vs ET rabbit hole, ET is what it is and I’m happy to deal with it.)
Now let’s talk about piano and bass doubling parts.
A piano when properly tunes will be pretty damn spot on Equal Temperament, the closer the bass is to proper intonation the better the 2 instruments will sound together.
So this is what I was referring to when I spoke about tuning an fretted instrument out of the ratios and scale it was designed for, and why the intonation might be of concern when going with alternate scale and ratios.
My vernacular might not still be correct but I hope the meaning is getting across.
Before people get defensive because the didn’t read my previous post.
Tune, play, perform your bass however you wish.
Want to play it with your toes and teaspoons, have at it.