MTM’s or TMM’s: using sealed upper and TL (or similar) lower drivers?

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I know this sort of configuration theoretically introduces different “Q”, group delay , phase etc etc on the 2 “M” drivers if they are wired in parallel, but so does adding a coil on one of them in a 2.5, doesn’t it ??

Is this configuration really just a cabinet introduced 2.5 ??

How much does the different loading on the two drivers effect each of the drivers?

In an MTM, how much does introducing these anomilies effect the lobing, and other sound qualities?

and does the same apply if they are in a TMM configuration ?

Is there any simple way of electronically counteracting any group delay or phase problems this configuration might introduce??

So many questions, hope someone can answer !!
 
frugal-phile™
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Andy Graddon said:
I know this sort of configuration theoretically introduces different “Q”, group delay , phase etc etc on the 2 “M” drivers if they are wired in parallel, but so does adding a coil on one of them in a 2.5, doesn’t it ??

I'll only sidestep this a bit... the 2.5 has the phase differences at the top of its range (and these can be mostly shielded from the FR driver by the cabinet if you mount the 0.5 driver on the back).

Different driver loading effects the bottom of the drivers range where the wavelengths are much longer.

To judge the magnitude of the effect you would have to add the complex FR (mag+phase) of the 2 together.

dave
 
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