MTM good idea with these drivers?

[dabbler]

I have 4 x aurasound NS6 midwoofers (8 ohm) and pair of 6.5" MCM waveguides and selenium comp. drivers sitting idle and was thinking of putting together a highish efficiency speaker for the TV room (around 90db). My question is would a MTM be feasible considering the higher CTC spacing with a waveguide? I wouldnt think the selenium would be comfortable crossing lower than 2k in this waveguide and i'm wary of comb filtering, though ive never built an MTM so dont know how problematic it would be in reality

It would be nice to get the MTM benefit of minimised floor and ceiling reflections but don't want to push if it will cause more problems elsewhere. Would a 2.5 way be a better choice here?

[whgeiger]

Put each driver in its own enclosure.
Then you can arrange as you like for a particular venue.
Regards,
WHG

[dabbler]

Ha! Good idea and would look cute too = +1 WAF points

[AllenB]

For a successful MTM, time alignment becomes important. Not easy with a waveguide.

[dabbler]

Hi Allen, I was planning on using miniDSP so can delay the drivers. However I might take this project in another direction anyway.....

[AllenB]

What is the main benefit of MTM anyway? Vertical dispersion? A good thing, for sure, but there are other and more important things out there. Good luck with what you're going to do instead.

[dabbler]

Yes and of course higher efficiency over regular 2-way. I think 2.5 way would be the better option here anyway. I may still have a crack at the MTM with a dome tweeter sometime in the future.

[AllenB]

If you are considering 2.5 way, there's one thing I'd like to add. Your 0.5 way cuts in and adds more total energy to the room, when only the on axis response is at issue. No matter what you do with the 0.5 way, your baffle width will have it's effect on your room. Have you ever built a wide baffled closed system?

[erickalan77]

I think MTM are pure BS....We recording engineers and sound engineers never use them...
You are getting different arrival times from the drivers in anything but the sweetest of sweet spots...bluring the image the artist and engineers intended for you to hear....you are no longer reproducing music with an MTM but creating it....you are coloring the sound like all those horrible Bose products out there. I am not sure where Dickinson came up with the idea that there were going to be cancellations at the ceiling and floor....that is impossible to predict and control, it is just theory that somewhere at sometime it will happens....room reflections are accounted for when we recording engineers reverb our songs....we use less as we know your room is going to be live....so we mix in a dead room to hear and control the true sound out of our monitors and rough in some reverb but we do final reverb in a live room..... Death to the MTM !!!! so says this recording engineer....
Think of how many comercial products you see using MTM ...virtually none, even wilson watt stopped doing it and you will never see a pro speaker built as an MTM.... we does use arrays for shear volume in an outdoor live situation ....and they sound pretty crappy but the are loud. . . .

[dabbler]

I guess MTM and 2.5 way are both compromised solutions to the same problem - increasing efficiency of a small driver. When you need a small footprint and narrow baffle its only way get the job done.