Replacing driver screws with brass screws

We have a resonance tuning method that can be performed from the outside back of our cast cabinets. Never tried it on mdf or the like. Couple of degrees and you get a different out come.Tighter  slightly faster and maybe thinner..looser a little warmer and full. Been doing this since 2003. Installed the new Purifi driver just incredible now I need to install the new resonance tuner.  Tom

We do the same with an internal crossover mounted on our points and the tuned externally like the woofer. Big difference there as well. Cant do that on springs or such musical deletion devices. Tom

Peter of PBN speakers and electronics seems most likely. Tom

In the past I worked for a Dunlavy dealer and spoke with John Dunlavy several times.  I told him I replaced all the steel fasteners with brass and he laughed..he laughed again when I told him I replaced the sand cast resistors with a resistor bridge made up of many Vishays..he told me resistors make no difference I laughed with disappointment that such a great designer had not considered such simple items to try or replace. If you cant measure IT then IT can't be heard. WRONG..Tom
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In 2002 I started a thread on Audiogon about modifing my Dunlavy SC4s included were replacing all the ferrous fasteners with brass including rebuilding and taking the crossovers outboard. Coating the inside walls with Cascade V Bloc a sealer that dried like concrete..a big improvement.  Tom

Well Jitter where are you hiding Geoff Kait? Ask John yourself I dont have access to our customer data base at home. Tom

Jitter look up the transverse shear velocity of the metals you mentioned..add to that list aluminum and all their many cousins. Shear velocity and their polarities are a big key to how things sound and why they sound so different. Tom

Jetter where did that last post go?

There is a Audiogon member who replaced all of the steel fasteners on his PBN speakers with brass.  He has them within a Star Sound Energy Room. Tom

Roxy,

It has worked for me and all of our customer base for over 20 years. 
Tom..Star Sound Technologies 
           Tone Acoustics

Took a beatin in the early 2000's and kept on kickin..Robert and I..Thanks for the good speak. Always looking forward for a better way.  Cryptic I am about some things I am working on and get excited about somethings that bring false hope but those hopes sometimes lead to something wonderful as I am listening too now. The toughest thing is to be able to explain why it works and how it could further improve the event. Let you know when I can. Tom

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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