Replacing driver screws with brass screws


There was some discussion about this on Millercarbon's thread about the Moab speakers, and I wanted to pursue the subject further without interfering with his thread.
As I stated there, I have heard about this practice for quite a few years, but never tried it because it seemed like one of those lunatic fringe ideas; and even though I actually really enjoy trying tweaks, and have found many of them effective, I just was not prepared for what this one did for the music coming out of my speakers. 
Specifically, it improved the detail in ambient trails, focus in general, complex harmonics in voices and stringed instruments, and instrumental separation. It is not subtle, and it is immediately noticeable.
So, I am curious to know how many of you out there have tried this, and what your experience has been.
Thanks, John  
128x128roxy54
I'm certainly not qualified to rule out wood or any other metal. If I hadn't read about brass years ago, I would never have considered it.
I do wonder about wood screws though...wouldn't they be very fragile and hard to manufacture?
I’m not changing my speaker screws. If Peter says it’s of no effect- I am 100% confident in what he says. In years on these boards there is in my opinion only one or two other people whose analysis and conclusions are consistently rock solid. Peter is in the top 3 of “knows his stuff” 
There are several types of brass most have 59 to 63 % copper and up to 3% lead the balance being zinc. I use 3 different brass types in my endpin designs for cello, though predominantly just 1 type. The differences are audible. I also use rare earth materials in conjunction with the brass and it is these materials that make my endpins more or less reactive to touch and vibration. Specific mix ratios of materials are part of the blend.

Most metric sized brass is c385. Metric sized threads are what holds most domes in place to a tweeter bezel..These are the closest screws to the moving coil and will disturb the flux field of the moving coil if they are steel..which they always are in my experience. You should definitely replace these with non ferrous fasteners..brass is what I know.  Brass has between 35 and 70 % slower shear velocity than most commonly used metals.
Low shear metals sound the best in my opinion..other than lead and tin.
There is a very audible difference between using a small steel set screw and one of brass within my endpins. The steel screws the whole sonic balance off and required a total rebuild. Tom
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