Torres609 wrote:My brother owns both a 664 and 650 scale and when I play them, I find the difference isn't noticeable providing you've carefully set up the action height. The difference at the first fret is under 1.5mm so from my perspective, undetectable. Perhaps it's a psychological issue in that we expect 664 to be harder? My bro's 664 is set at 3.75 bass side and 3.00 treble side using D'Addario E46 strings (he's not an aggressive player) whereas the 650 needs a little extra height with 4mm bass side (same strings). They sound quite similar with the 664 having a slightly stronger bass response.
Personally I have found quite remarcable differences between A1 of 664mm and "other" - no ramirez - 650mm's.
with pure mathematics, the length of the first 1/4 of the string, ( = 0 to 5th fret ) has exactly a 3,5mm difference. So for the diagonal, some more. If we add to this the bigger nut ( of 54mm ) it's even something more, where for instance we play wide left hand positions at the first frets, I roughy calculate that we can have an actual difference of 0,5 cm wich for me is quite remarkable and would take some use-to.
" My bro's 664 is set at 3.75 bass side "
If possible could you confirm that measure? I am very surprised for it to be that low, as the fretboard is "shaved" at the 12th bass side and measures typically bigger.. I have a 4+mm bass side, and almost zero bone left to go lower.. ( lowered even more recently ! ). If you are accurate, chances are that your 1A's bridge is shaved down, for an even smaller saddle bone?
thank you in advance!