Originally Posted by Alimentall
A-ha. So you're saying you *could* model speaker design as opposed to 'it's an equation'. Until it actually *is* a series of equations, a full simulation, there is nothing to get 'under determined' in the simulation that doesn't exist. Because if you actually do a real simulation, you'll find that adding advanced DSP into the simulation will cause some of it to get 'zeroed out' and the simulation suddenly become simpler, just as it is in real life.
There ARE computer programs that can model this in existence. A speaker is basically
a mechanical system. There are computer programs that can EASILY handle such
mechanical systems. My lab is responsible for one of the most used and most
DYNA3D has been used in the design of jet engines; like that pictured, and has been
used to analyze the earthquake response of the Golden Gate and Oakland-Bay bridges.
It could CERTAINLY handle a loudspeaker driver.
Now what are blathering about something getting "zeroed out" when you use DSP.
Be specific - WHAT gets "zeroed" because of DSP?
Such a simulation would have to have all the driver measurements for every driver in existence, as well as the ability to custom order or design drivers from scratch, shape the cabinet, make it have some WAF factor for those who have wives, etc, etc. It doesn't exist, therefore, humans still do all the hard work and use tools to accomplish their goals, the most advanced tool now available being DSP crossover/impulse response correction, aka DEQX.
No - you don't have to know about every driver in existence. YOU tell the computer
what the driver in the speaker you are designing looks like - and what its properties are;
compliance of the cone suspension, for example. It computes how that driver moves.
Couple that to a wave equation, and you can calculate the soundfield.
Don't like the result? Change the design of the driver - change the compliance and
redo the calculation. Once you get something you like; THEN you can hand the specs
over to craftsmen to actually make the part.
This is how jet engines, airliners, cars....LOTS of things are designed.
Why would you "think" that you would need to know the parameters of every driver
in existence??? Why would you even consider that you needed that? You are designing
a tweeter for NHT; why would you need to know what a woofer being made in Germany
Come on, John; put on your "thinking cap".