MTM or Single Mid configuration

[domtweaker]

Is it worth to spend the money for dual mids and designing an MTM set up ?


I am using a Marchand Tube X over and thinking of running an MTM design.

Speakers will be a 3 way active

I am thinking ATC Dome mids that is

What are the benefits and is it worth the $$$$ to go with four mids ?

thanks Guys

Cheers

[sreten]

Hi,

MTM mids with the ATC dome midrange is the dumbest idea I've heard in a long time
(And very expensive ...)

MTM only makes sense for 2 ways, not 3 ways, for 3 ways perhaps its BMTB that works.
(Smooths floor bounce issues in the bass, dual midranges are nearly always pointless.)
but many would still do a 3 way as BBMT.

Quite frankly the MTX IMO is a recipe for doing things incorrectly, and its hard to do right.

rgds, sreten.

[domtweaker]

So why so many companies do it

ProAc did it

Rockport does it

JM LAB

they are all 3 and 4 ways ????

[planet10]

There are reasons for an MTM (unfortunately fashion is one of them), but in almost every situation XO is too high. Much more flexibility if you just use one mid.

dave

[Cal Weldon]

I would venture a guess that the only real reason you would consider two mids is power handling.

[domtweaker]

I am sure looks have to do with it YES

but the response seems to be the improved issue too.

Xover is no issue as I am using an electronic so just a matter of swapping cards

BUT is the $$$$$ worth the difference ?? OR is it most looks and little performance ?

[sreten]

Hi,

Yes power handling might be the only reason, but that indicates poor c/o points.

Changing the mid c/o point by half an octave negates the need for two of them.

The only sensible reason for having MTM midranges is sensitivity issues.

rgds, sreten.

[domtweaker]

There is no advantages in terms of the response ??

[planet10]

Originally Posted by domtweaker

Xover is no issue as I am using an electronic so just a matter of swapping cards

Active XO is not a fix it all. Ideally ou want to get the drivers centre-to-centre within a 1/4 wavelength at the XO. Mid-to-tweet in an MT, Mid-to-mid in an MTM. This last means that, with say 6.5" bass drivers & allowance for a 3.5" bezel on the T, that an XO <400 Hz is required.

dave

[planet10]

Originally Posted by domtweaker

There is no advantages in terms of the response ??

Some posit an advantage due to vertically symmetric lobing.

dave