Re: DIY Portable PA question


"Middle C" <Middle_C@xxxxxxxxxx> wrote in message
news:b14f4$469f3da4$471e1274$7467@xxxxxxxxxxxxx
If you have not already, look for a program call WinISD. It
will help you figure that out - assuming you have the thiel
parameters for the speakers you intend to use. I'm sure
both would work in a sealed enclosure - it's just a matter
of how efficient they will be. Porting gets a little bit
trickier as it allows the speaker to move more freely, and
if it's not up to the task, could more easily be damaged.


--
keith c..


While computer aided design (CAD) software will help the
accomplished designer hit the mark. Without knowing realistic
specs to expect there is little point in using CAD. If one can
not intuit what a curve sounds like there is no way realistic
expectations can be input. Novice users tend to put
unrealistic specs into the modeling software and although the
finished product may come close to the specifications what
comes out as sound is usually disappointing. You have as good
a chance to get to your moms by guessing GPS coordinates as
you do in getting the sonic performance you are after by
guessing Fc or F3 along with passband ripple, and HF cutoff.

Now if you know the sound of something you like and you can
find the specs ( honest specs not marketing BS) perhaps you
can use a CAD program but from experience I can tell you it is
much easier to start by buying a design that works than to try
to beat professionals at their trade out of the gate. Get used
to a commercially successful design, get the tools to
investigate what is happening and what you hear then try to
copy or better it. Don't be fooled by any paper descriptions
spec numbers or graphs, only thing that counts is the sound.
If you have a graph from what you are listening to made where
you are listening then try to learn something from it but
again don't count that as truth cause moving the measurement
mic a couple of inches will change the graphs. Try that over
and over and try to make a correlation with what you hear.
Without highly developed listening skills you can not succeed
in making an accurate good sounding speaker.

Then again just throwing a driver in a box and firing it up is
a lot of fun and after you listen to your Frankenstein
creation for a while and contort the EQ on your amp your brain
can convince your ears that what you are hearing is music.
Works every time, just like the stereo illusion, except people
not accustomed to the sound of your Frankenstein will have a
very short listening fatigue time and you will find you have
built a great device to clear a room. I have seen and heard
this a hundred times in my life as a speaker builder/
crossover network designer, mostly from my own designs.

Good luck

peace
dawg


peace
dawg


.

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