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Discussion in 'Speakers' started by MarshallSlate, Aug 24, 2003.
Ita all about tradeoffs. Presuming you are using a sub, 2 transducers can handle the 8 octaves between 75 and 20,000 Hz without straining much at the edge of their jurisdiction. By using a mid range in addition to a woofer and tweeter, then each transducer only has to cover about 2.7 octaves instead of 4. This has the benefit of lowering the need of drivers to work near the edge of their frequency ranges. But the price is high. This benefit is overwhelmed by the downside of needing a complex 3 way crossover that wreaks havok with the signal.
There are a reasonable number of center speakers with three drivers. Crossovers are usually at about 400Hz-500Hz and 3.5KHz–4KHz. Here it appears as though the attempt is to get the human voice into a specialized driver.
A lot of them do. 2 way vs 3 way (or more, or halvsies). 3 way does cost more. A lot of people feel, that in general, 3-way speakers give better sound quality in that each driver is responsible for a smaller part of the audio spectrum. But realistically, it's all in the implementation. There are good 2-way's just as there are crappy 3-ways...
It is a heck of a lot harder to fully integrate three drivers than two. However, done right, it can be magical!
Or did you mean "how come most loudspeakers don't reproduce midranges"?
Actually don't most mid-fi speakers today have 5" to 6" drivers in addition to their 0.75"-1" tweeter? Aren't those 5" drivers closer in size to what used to be called midranges? I remember the old 3-way speakers my dad had from a 1985 Kenwood system (bought from Macys!) had like a 1" tweeter, a 5" midrange and a 12" woofer. So maybe the question should be why don't most loudspeakers have woofers?
Suffice it to say in comparison to that, my MB Quarts which have dual 6" drivers sound better. Of course I would hardly call those the ideal 3-way speaker.
I consider anything below, and including, 6-1/2" to be a midrange driver.