Originally Posted by iduhfuse
Okay, so multiple drivers for say the midrange frequency don't necessarily mean it would be better than having one driver for that range. Or even one driver to share a midrange and low frequency range like the martin logan motion 20.
Twin Midrange drivers does have advantages, but not the advantages you would think.
If Twin Mid are wired in Series, then the sound output is identical to a single driver. But, each driver is driven half as hard, and will handle double the power.
If Twin Mid are wired in Parallel, there will be an increased output, but then you tend to have impedance problems. About the best you can do is two 8 ohms in parallel for a resulting impedance of 4 ohms. That's not terrible, most amps can easily handle 4 ohms, especially in the midrange. But it is a design consideration.
Now if you are a speaker manufacturer and you design your own drivers, you can have them made to any impedance you want ... within reason. But there are trade offs there too. Every design is a compromise. What are you willing to trade in one area to maximize something in another area.
Though not always so, generally, most Mid driver are not Midrange drivers, but rather Mid-Bass drivers. If you look at the crossover frequencies in the specs of a given speakers, if the Low to Mid crossover is relatively low, then very likely it is a Mid-Bass design.
There two common 3-way designs -
The older Woofer, Mid-Range, Tweeter designs.
But modern speakers take a slightly difference approach. They are Low-Bas, Mid-Bass, Tweeter designs. Typically these use larger Mid-Bass drivers, which is one clue as to the design.
Some seeming 3-way speakers are actually 2.5-way. In the low bass area, both Low-Bass and Mid-Bass run in parallel, both playing music. As the frequency rises, the Low-Bass drops out and the Mid-Bass carries on. Again, the strongest clue is the location of the Low-Bass to Mid-Bass crossover.
As an example, in a 2.5-way system, the Low-Bass to Mid-Bass Crossover might be around 200hz.
In a modern 3-way, the Low-Bass to Mid-Bass crossover might be 400hz.
In a old fashioned 3-way, the Woofer to Mid-Range might be around 800hz.
All these are valid speaker designs, and all can yield good results, but each compromises the design in a slightly different way.
As other has said, you ears will tell you what you like best. But any design method is capable of yielding a great sounding speaker.
Because I'm a bit old school, I like big Bass Drivers. I come from an age when dinosaurs roamed the earth and the average kid on the street had speakers with 12" woofers. If you had 8" woofers you were considered an amateur in the world of music listening. Today, you would be very luck to even find woofers larger than 8". Though admittedly most speakers with 8" woofers have TWIN 8" woofers in each box.
Just as a point of interest, here is some information I gathered about the relative size of various bass drivers. This can help you determine the equivalent of 3x6.5" bass drivers.
For example, 1x6.5" has a relative value of 2.64, so 3x6.5" would have a relative value of 3 x 2.64 = 7.92
A single 8" driver has a relative value of 4, so two 8" drivers would have a relative value of 8.
Comparing the two, we see that 3x6.5" equal 7.92
and 2x8" equals 8
. Those are relatively the same size.
This isn't definitive, it is just a guide for relative speaker size.
But the charts could come in handy for someone needing to compare two speakers with a different number of different sized drivers.