Today's hot topic: Loudspeaker design basics, part 5
Product: Loudspeaker drive units
Price: musical resolution
Humble scribe: Mark Wheeler - TNT UK
Typed: Spring 2009
OK plebs: stand by your beds! We've gotta shape up and ship out 'cos there's work to do.
"Not those infernal noisy power tools again?" Demand plebs, stage left;
The only power tool you'll need today is a pocket calculator, reassures the old speaker builder
We already considered the basic purpose of our loudspeakers in part 1 and the generalities of choosing and using drive units in part 4, so now we are ready to scrutinise those catalogues with our calculators in our hands.
"What?" Demand plebs, from stage left, "Surely we're going to use software to model bass response from T/S
parameters; surely the old fool isn't going to make us manually calculate spot frequencies and plot them on graph paper? Doesn't
the old fool know what century we're in?"
"Well," replieth the ancient one, "bass alignment isn't the only thing we can derive from specs, and is possibly one of the least audible decisions we'll make at the design stage assuming we choose an alignment somewhere between Bessel and Butterworth. Furthermore, sometimes the tedious detailed activity of manually drawing out graphs is more informative as it makes us stop and think: it certainly works for load lines when juicing up a valve (tube), but that's another story."