E
Edward Morris
Guest
I have a Wharfedale speaker book, in which are plans to make speakers boxes
out of concrete block or brick. What a hefty speaker that would be!!
Eddie
"Dave Platt" <dplatt@radagast.org> wrote in message
news:vc3p08-9lp.ln1@radagast.org...
In article <bimij6tublidhp9dko98e5m2t0e2lftbj2@4ax.com>,
JW <none@dev.null> wrote:
granite). Ideally, you'd like the resonant frequency of a cabinet to
lie well outside the frequency range excited by the driver(s)
inside... either below, or above. It's also beneficial if the cabinet
is relatively "dead" (low Q).
Granite is quite heavy (lowers the resonant frequency), but also quite
stiff (raises it)... I'm not sure what the resulting resonant
frequency of a typical cabinet made of granite would be. I suspect
that its Q probably isn't all that low.
Stiffening a speaker cabinet with internal bracing will usually raise the
resonant frequency (the increased stiffness outweighs the added mass).
Now, a laminate composed of two or more layers of stone, separated by
a very lossy damping compound (a "constrained layer" arrangement)
could be quite interesting.
Unwieldy, though... it's bothersome to have to drive a forklift into
your living room to position the speakers properly. Tough on the
hardwood floors, and even worse for the carpeting
--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
out of concrete block or brick. What a hefty speaker that would be!!
Eddie
"Dave Platt" <dplatt@radagast.org> wrote in message
news:vc3p08-9lp.ln1@radagast.org...
In article <bimij6tublidhp9dko98e5m2t0e2lftbj2@4ax.com>,
JW <none@dev.null> wrote:
Well, there's probably a trade-off there (especially with regard to
granite). Ideally, you'd like the resonant frequency of a cabinet to
lie well outside the frequency range excited by the driver(s)
inside... either below, or above. It's also beneficial if the cabinet
is relatively "dead" (low Q).
Granite is quite heavy (lowers the resonant frequency), but also quite
stiff (raises it)... I'm not sure what the resulting resonant
frequency of a typical cabinet made of granite would be. I suspect
that its Q probably isn't all that low.
Stiffening a speaker cabinet with internal bracing will usually raise the
resonant frequency (the increased stiffness outweighs the added mass).
Now, a laminate composed of two or more layers of stone, separated by
a very lossy damping compound (a "constrained layer" arrangement)
could be quite interesting.
Unwieldy, though... it's bothersome to have to drive a forklift into
your living room to position the speakers properly. Tough on the
hardwood floors, and even worse for the carpeting
--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!