I have always thought that although there are advantages to both methods of contruction and of course - how much care, attention and skill goes into a bass matters more than the method - I still have this feeling that you can get a lower action from a neck-through bass. So, I was in a bass shop yesterday and tried two basses that were pretty much equivalent and well set up - but ones was bolt-on and one was neck through. So I was comparing the Warwick Streamer LX - wide neck 5-string (bolt-on) with the Yamaha TRB5P (neck though). As I say both were well set up and of pretty high quality for production basses - in the same price/quality bracket. BUt it was very noticable how the Yamaha had a much lower action all ower the fretboard - right up to the 24th fret, making it very much easier to play in the upper register. Whereas the Warwick's action was higher as you went up the neck. Looking closely at both basses - the only reason I could see for this was that the Warwick's neck joint meant that the angle was such at the higher register that it was impossible to get a lower action. The neck joint was very good and tight, but it seemed to impose an angle that mean the strings couldn't be low at this point. The Yamaha had no such problems - and the through neck mean that the string height was even all the way. So - is it always the case that all other things being equal (of course cheap neck-throughs will not be as good as high-end bolt-ons!) that a neck through bass will have lower action and improved playability in the upper register?