Discussion on what materials to build speakers out of

[planet10]

Originally posted by 454Casull

From what I remember, increasing the thickness will also raise resonant frequency, since stiffness goes up with the cube while mass only follows linearly with thickness.

I'd have to look it up to confirm, but i think that adding mass lowers resonance by the square.

dave

[tinitus]

In my next 3way "classic monitor", I might make a seperate mid/tweeter baffle of 6mm aluminium

In general fore bigger baffles I think a 10mm aluminium baffle would be nice - could be finished with wood

[tinitus]

BTW.. I will use cheap "eastern" plywood

I dont care if baltic or marine plywood is of better quality - I like "soft wood" for speaker cabinets and as fore the finish, it will be left rough as it is

Like others I think MDF has no soul at all, actually it has been said that the HDF is the worst of all

[chrisb]

Originally posted by Cal Weldon




Wait... did Cal and Chris just agree on something audio? Uh-oh.

I knew if I waited long enough, you'd come around.

Jumbo sized bass electons need jumbo wire, you know that.

"As everybody knows high power amplifiers use larger electrons to achieve this high power. The bigger electrons don't start or stop as fast as normal electrons resulting in much heavier, less nimble watts.
So high power amplifiers can never have the finesse of low power amplifiers. High sensitivity speakers only work with the smaller electrons (the smallest are produced by tube amplifiers).
Thus if you use a high power amplifier with sensitive speakers you need a transformer that slims down the electrons and makes them
swifter. Such transformers are available from Jenny Craig Audio Inc., Phen-Fenophile Corp. and the US Nuclear Agency."

Alan Ross
PS. Don't forget to elevate the amplifiers above the speakers, so the signal can flow easier.


cheers Cal

[peterbrorsson]

"As everybody knows high power amplifiers use larger electrons to achieve this high power. The bigger electrons don't start or stop as fast as normal electrons resulting in much heavier, less nimble watts.
So high power amplifiers can never have the finesse of low power amplifiers. High sensitivity speakers only work with the smaller electrons (the smallest are produced by tube amplifiers).
Thus if you use a high power amplifier with sensitive speakers you need a transformer that slims down the electrons and makes them swifter.
Such transformers are available from Jenny Craig Audio Inc., Phen-Fenophile Corp. and the US Nuclear Agency."

Now that's what I call science, or marketing for Electroworld super market

Cheers
Peter

[Cal Weldon]

Cheers Chris, thanks for bringing out the whole quote. It's one of my favourites.

[Ed LaFontaine]

Why didn't someone let me know this was going on?...Like around post #65?

From ScottMOOSE:

Either that, or line the regular 3/4in material with at least 1/4in of concrete board, as Bob Brines does with his MLTLs. That works, but you then run into other problems such as energy storage.

I'm cutting 3/4" mdf now. I have the cement board and #420 acoustic panels at hand. Please suggest any options I have to overcome energy storage. Cross-bracing?

[Peter Daniel]

In my most recent speakers I used sonotube, plywood and 1/4" aluminum angles. Those pieces allowed me not to use conventional baffle for TM section:

[Peter Daniel]

Here's the inside view:

[Peter Daniel]

Due to that arrangement the tweeter and midrange surfaces are in the same plane (Esg1 mounts from outside, FAL from inside). The sonotubes are filled with sand, the outside is veneered with plastic laminate (high gloss black)