Thanks a bunch rayma! It's funny - from my education, I am most familiar with the mechanical side of physics, but I have the best understanding of impedance, resistance, inductance and capacitance from the few courses I "had to take" on electrical engineering. They drew some analogies between mechanical and electrical systems in one of my physics classes and that helped a lot to conceptualize, but it was mostly re-using the same equations and sadly they never drew analogies to acoustics. From the preface, I look forward to this!
-Mack
-Mack
While I've got y'all's attention...
There are plenty of sites that have black box port calculators and some distinguish between round and slot ports - they yield different results depending on the port aspect ratio. Are they just using equivalent diameter in the resonator equation?
There are plenty of sites that have black box port calculators and some distinguish between round and slot ports - they yield different results depending on the port aspect ratio. Are they just using equivalent diameter in the resonator equation?
Okay! I'm on page 20 of Olson #1 and my mind is half melted, half blown.
So a bass reflex is a forcing function subwoofer driving an acoustic spring in the volume resonating with an acoustic mass in the port limited by some sort of damper if your port velocities are too high and/or there's significant stuffing in the enclosure. The whole "stuffing lowers the frequency and efficiency" statements make a whole lot more sense now!
The analogies to Newtonian physics quantities (force, mass, momentum, velocity, energy) are less intuitive because they each have an analogy and because of the obvious goal of tying this all to the 2nd order ODE for a vibrating "element".
I find it amusing in his Definitions section, "Instantaneous Electromotive Force - The instantaneous electromotive force between two points is the total instantaneous electromotive force." I spun my wheels there for too long.
Anyway, my brain's done for tonight. Having a beer at the end of my holiday. Back to work tomorrow.
-Mack
So a bass reflex is a forcing function subwoofer driving an acoustic spring in the volume resonating with an acoustic mass in the port limited by some sort of damper if your port velocities are too high and/or there's significant stuffing in the enclosure. The whole "stuffing lowers the frequency and efficiency" statements make a whole lot more sense now!
The analogies to Newtonian physics quantities (force, mass, momentum, velocity, energy) are less intuitive because they each have an analogy and because of the obvious goal of tying this all to the 2nd order ODE for a vibrating "element".
I find it amusing in his Definitions section, "Instantaneous Electromotive Force - The instantaneous electromotive force between two points is the total instantaneous electromotive force." I spun my wheels there for too long.
Anyway, my brain's done for tonight. Having a beer at the end of my holiday. Back to work tomorrow.
-Mack
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