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In Reply to: RE: DIY amplifier wood case question posted by krankkall on February 14, 2017 at 14:36:36
Here are some observations for you concerning wooden chassis
embellishment:
(1) Two metals drastically outperform all other metals:
Brass and Steel. If you use brass, make your fasteners stainless
steel.
If you use steel, make your fasteners brass. In both cases, all iron
must be physically elevated above the chassis. Aluminum is THE WORST
metal from a sonic standpoint-- it dulls, and it reacts against
steel (your transformers and chokes). This isn't funny musically.
(2) If your chassis is built correctly, wooden panels, etc., will
seriously degrade overall performance.
(3) If your chassis is a lightweight "tin-can", then wooden panels
will provide some badly needed acoustical dampening. With proper
construction, however, this should NOT be used.
(4) The "best" overall wood for this, performance-wise, is solid Maple.
(5) Wooden panels, while decorative, create "hot" spots" in a chassis--
acoustically. Wood isn't uniform, and attachment never is, either.
(6) Wooden parts around electrical equipment, while stylish, is a
definite fire hazard.
There you are!
-Dennis-
Follow Ups:
"Aluminum is THE WORST
metal from a sonic standpoint-- it dulls, and it reacts against
steel (your transformers and chokes)."
Please elaborate on this. How does it dull? - Pete
Take what I tell you in the right spirit-- I'm talking all-else-being
equal here.
By using the right capacitors, wiring, layout and parts, and by correcting a few circuit points, one can make almost any material
sound better than ordinary. Understand That I'm talking in idealistic
terms-- as in "the best".
There! Now we can talk! To Industry Professionals who build studio
gear, and to people like me who try to build "ideal" electronics for audio, Aluminum has a "whitish" coloration.
That is, it imparts both a dulling, and at the same time, a reactive
component-- it generates an aggressive upper midrange highly-driven "bleaching out"-- this might not be noticed on low or medium-Eff. speakers.
Arguments abound about this "whitish" idea-- is this caused by aluminum reacting against iron components, or is it also just part of aluminum itself? I don't pretend to know, but I suspect it's a combination of both.
I use aluminum for LOW VOLTAGE power supplies with no problems at all.
When I mount High-Voltage components, the aluminum starts to sing, and dull transients slightly at the same time. It is reactive and absorptive at the same time.
I would use it with great caution for another reason-- it is poisonous--
that is, the filings and dust are. Is it as bad as Lead? Well, it does
different things-- it usually ends up in brain and nerve tissue, Lead usually does that but also, Lead, due to its weight, tends to accumulate
more in lower areas such as your legs. Both aluminum and Mercury are brain and nerve poisons. SEE: Alzheimer's Disease, Mercury poisoning, "mad-Hatter's Disease", and etc.
Aluminum? You don't need it for many reasons. When you do use it, don't breathe the dust and don't get it on your skin....
-Dennis--
Dennis - There are a few good reasons to use aluminum chassis. They are non-ferrous so they don't conduct magnetic lines of flux. It's lighter and easier to tool. Aluminum conducts heat better than steel.
As a builder in an apartment, I have to use a power drill so aluminum is my friend. It's very hard to drill through steel that way.
Plus you used terms like "whitish" and "bleaching out" of the sound. I have never heard such terms.
I work in one of the worlds largest TV & film mastering facilities. Our building is flanked by two major recording studios. One of which is "Ocean Way Recording", who also have an esteemed studio in Nashville. We have done several installations in their equipment spaces.I would estimate 90% of equipment enclosures are aluminum.
This is just more of your tired old drivel. As usual you have absolutely no scientific data to back up these outlandish claims.
Edits: 02/17/17
That guy from Serious whatever is from another industry - fantasy land.
Is about as hard they come. Now tell me if the hard vs. soft choice has anything to do with reflection vs. absorption properties. Or, do you base your choice simply on durability.
It should be sealed, first?
Brass fittings were used for height and tilt though ;-}
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